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bdu:2021-05756

BIT-jenkins-2021-21696

Affected: Bitnami: jenkins

Jenkins 2.318 and earlier, LTS 2.303.2 and earlier does not limit agent read/write access to the libs/ directory inside build directories when using the FilePath APIs, allowing attackers in control of agent processes to replace the code of a trusted library with a modified variant. This results in unsandboxed code execution in the Jenkins controller process.

cnvd-2021-103366

EUVD-2026-22415

fkie_cve-2021-21696

GHSA-c5r9-rx53-q3gf — Agent-to-controller access control allowed writing to sensitive directory used by Jenkins Pipeline: Shared Groovy Libra…

Affected: Maven: org.jenkins-ci.main:jenkins-core

Jenkins 2.318 and earlier, LTS 2.303.2 and earlier 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, LTS 2.303.3 prohibits agent read/write access to the `libs/` directory inside build directories.

If you are unable to immediately upgrade to Jenkins 2.319, LTS 2.303.3, you can install the [Remoting Security Workaround Plugin](https://www.jenkins.io/redirect/remoting-security-workaround/). It will prevent all agent-to-controller file access using FilePath APIs. Because it is more restrictive than Jenkins 2.319, LTS 2.303.3, more plugins are incompatible with it. Make sure to read the plugin documentation before installing it.

It is not easily possible to [customize the file access rules](https://www.jenkins.io/doc/book/security/controller-isolation/agent-to-controller/#file-access-rules) to prohibit access to the `libs/` directory specifically, as built-in rules (granting access to `<BUILDDIR>` contents) would take precedence over a custom rule prohibiting access.

gsd-2021-21696

RHSA-2021:4799 — Red Hat Security Advisory: OpenShift Container Platform 4.6.51 packages and security update

jenkins: FilePath#mkdirs does not check permission to create parent directories jenkins: File path filters do not canonicalize paths, allowing operations to follow symbolic links to outside allowed directories jenkins: FilePath#untar does not check permission to create symbolic links when unarchiving a symbolic link jenkins: FilePath#reading(FileVisitor) does not reject any operations allowing users to have unrestricted read access jenkins: FilePath#unzip and FilePath#untar were not subject to any access control jenkins: Agent processes are able to completely bypass file path filtering by wrapping the file operation in an agent file path jenkins: Creating symbolic links is possible without the symlink permission jenkins: The operations FilePath#renameTo and FilePath#moveAllChildrenTo only check read permission on the source path jenkins: When creating temporary files, permission to create files is only checked after they’ve been created. jenkins: FilePath#toURI, FilePath#hasSymlink, FilePath#absolutize, FilePath#isDescendant, and FilePath#get*DiskSpace do not check any permissions jenkins: FilePath#listFiles lists files outside directories with agent read access when following symbolic links. jenkins: Agent-to-controller access control allowed writing to sensitive directory used by Pipeline: Shared Groovy Libraries Plugin jenkins: Agent-to-controller access control allows reading/writing most content of build directories jenkins-2-plugins/subversion: does not restrict the na…