CVE-2021-21605

Description

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier allows users with Agent/Configure permission to choose agent names that cause Jenkins to override the global `config.xml` file.

CVSS Metrics

• v3.1•HIGH•Score: 8CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
• v2.0•MEDIUM•Score: 6AV:N/AC:M/Au:S/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.63%• Percentile: 71%

Techniques & Countermeasures

• CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

  The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected Systems

• jenkins project•jenkins

  ≥ unspecified, ≤ 2.274 | ≥ unspecified, ≤ LTS 2.263.1

• Unknown•Jenkins

  ≤ 2.263.1 | ≤ 2.274

• org.jenkins-ci.main•jenkins-core

  < 2.263.2 | ≥ 2.264, < 2.275

References (4)

• https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2021
• https://nvd.nist.gov/vuln/detail/CVE-2021-21605
• https://github.com/jenkinsci/jenkins/commit/b19b34db4b24b163d4edc53ccb84f41a3589cb08
• https://github.com/jenkinsci/jenkins