PT-2021-5386 · Jenkins · Jenkins

Daniel Beck · Published 2021-11-04 · Updated 2024-03-06 · CVE-2021-21691

Positive Technologies (AI Summary)

CVSS v2.0

10

Critical

Base vector

AV:N/AC:L/Au:N/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Jenkins versions 2.318 and earlier Jenkins LTS versions 2.303.2 and earlier

Description The issue is related to a flaw in the authorization mechanism of Jenkins, allowing the creation of symbolic links without the necessary 'symlink' agent-to-controller access control permission. This could potentially allow a remote attacker to impact the confidentiality, integrity, and availability of protected information.

Recommendations For Jenkins versions 2.318 and earlier, update to a version that includes the fix for this issue. For Jenkins LTS versions 2.303.2 and earlier, update to a version that includes the fix for this issue. As a temporary workaround, consider restricting access to the symlink functionality until a patch is available.

Fix

Incorrect Authorization

Link Following

Weakness Enumeration

CWE-863

CWE-59

Related Identifiers

BDU:2021-06223

BIT-JENKINS-2021-21691

CVE-2021-21691

GHSA-2C79-H2H5-G3FW

RHSA-2021:4799

RHSA-2021:4801

RHSA-2021:4827

RHSA-2021:4829

RHSA-2021:4833

Affected Products

Jenkins

References · 11

• https://nvd.nist.gov/vuln/detail/CVE-2021-21691 · Security Note
• https://osv.dev/vulnerability/GHSA-2c79-h2h5-g3fw · Vendor Advisory
• https://bdu.fstec.ru/vul/2021-06223 · Security Note
• https://jenkins.io/security/advisory/2021-11-04/#SECURITY-2455 · Vendor Advisory
• https://safe-surf.ru/specialists/bulletins-nkcki/671859 · Security Note
• https://osv.dev/vulnerability/CVE-2021-21691 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-jenkins-2021-21691 · Vendor Advisory
• https://github.com/jenkinsci/jenkins · Note
• https://github.com/jenkinsci/jenkins/commit/63cde2daadc705edf086f2213b48c8c547f98358 · Note
• https://t.me/cvenotify/22981 · Telegram Post
• https://access.redhat.com/security/cve/cve-2021-21691 · Note