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Security Advisories: GSA_kwCzR0hTQS1jdjJ3LXE4YzMteGp2N84AAqj6
Agent-to-controller access control allows reading/writing most content of build directories in Jenkins
Agents are allowed some limited access to files on the Jenkins controller file system. The directories agents are allowed to access in Jenkins 2.318 and earlier, LTS 2.303.2 and earlier include the directories storing build-related information, intended to allow agents to store build-related metadata during build execution. As a consequence, this allows any agent to read and write the contents of any build directory stored in Jenkins with very few restrictions (build.xml
and some Pipeline-related metadata).
Jenkins 2.319, LTS 2.303.3 prevents agents from accessing contents of build directories unless it’s for builds currently running on the agent attempting to access the directory.
Update Pipeline: Nodes and Processes to version 2.40 or newer for Jenkins to associate Pipeline node
blocks with the agent they’re running on for this fix.
If you are unable to immediately upgrade to Jenkins 2.319, LTS 2.303.3, you can install the Remoting Security Workaround Plugin. 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.
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1jdjJ3LXE4YzMteGp2N84AAqj6
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Critical
Classification: General
Published: almost 2 years ago
Updated: 4 months ago
CVSS Score: 9.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Identifiers: GHSA-cv2w-q8c3-xjv7, CVE-2021-21697
References:
- https://nvd.nist.gov/vuln/detail/CVE-2021-21697
- https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2428
- http://www.openwall.com/lists/oss-security/2021/11/04/3
- https://github.com/jenkinsci/jenkins/commit/cf388d2a04e6016d23eb93fa3cc804f2554b98f0
- https://github.com/jenkinsci/jenkins/commit/eae33841b587da787f37d5b6c8451d483edc04d9
- https://github.com/advisories/GHSA-cv2w-q8c3-xjv7
Blast Radius: 1.0
Affected Packages
maven:org.jenkins-ci.main:jenkins-core
Affected Version Ranges: <= 2.303.2, >= 2.304, <= 2.318Fixed in: 2.303.3, 2.319