Jenkins before version 2.319 does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs. This directory is used by the "Pipeline: Shared Groovy Libraries" Plugin to store copies of shared libraries. This allows attackers in control of agent processes to replace the code of a trusted library with a modified variant, resulting in unsandboxed code execution in the Jenkins controller process. Jenkins 2.319 prohibits agent read/write access to the libs/ directory inside build directories.
Jenkins before version 2.319 does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs. This directory is used by the "Pipeline: Shared Groovy Libraries" Plugin to store copies of shared libraries. This allows attackers in control of agent processes to replace the code of a trusted library with a modified variant, resulting in unsandboxed code execution in the Jenkins controller process. Jenkins 2.319 prohibits agent read/write access to the libs/ directory inside build directories.
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423
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