module
Jenkins ACL Bypass and Metaprogramming RCE
| Disclosed |
|---|
| Jan 8, 2019 |
Disclosed
Jan 8, 2019
Description
This module exploits a vulnerability in Jenkins dynamic routing to
bypass the Overall/Read ACL and leverage Groovy metaprogramming to
download and execute a malicious JAR file.
When the "Java Dropper" target is selected, the original entry point
based on classLoader.parseClass is used, which requires the use of
Groovy metaprogramming to achieve RCE.
When the "Unix In-Memory" target is selected, a newer, higher-level,
and more universal entry point based on GroovyShell.parse is used.
This permits the use of in-memory arbitrary command execution.
The ACL bypass gadget is specific to Jenkins on later versions of Jenkins.
Tested against Jenkins 2.137 and Pipeline: Groovy Plugin 2.61.
bypass the Overall/Read ACL and leverage Groovy metaprogramming to
download and execute a malicious JAR file.
When the "Java Dropper" target is selected, the original entry point
based on classLoader.parseClass is used, which requires the use of
Groovy metaprogramming to achieve RCE.
When the "Unix In-Memory" target is selected, a newer, higher-level,
and more universal entry point based on GroovyShell.parse is used.
This permits the use of in-memory arbitrary command execution.
The ACL bypass gadget is specific to Jenkins on later versions of Jenkins.
Tested against Jenkins 2.137 and Pipeline: Groovy Plugin 2.61.
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