CVE-2021-21696

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.

Published: Nov 4, 2021
Updated: May 9, 2024
CVE: CVE-2021-21696
GHSA: GHSA-c5r9-rx53-q3gf
Severity: Critical
Exploit:

CVSS v3:

Severity: Critical
Score: 9.8
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v2:

Severity: High
Score: 7.5
AV:N/AC:L/Au:N/C:P/I:P/A:P

CWEs:

CWE-693

Affected Software
References

Software	From	Fixed in
jenkins / jenkins	-	2.303.2.x
jenkins / jenkins	-	2.318.x
org.jenkins-ci.main / jenkins-core	-	2.303.3
org.jenkins-ci.main / jenkins-core	2.304	2.319

http://www.openwall.com/lists/oss-security/2021/11/04/3
https://www.jenkins.io/security/advisory/2021-11-04/#SECURITY-2423

Vulnerability Database

CVE-2021-21696

Deep Security Visibility Without the Complexity