PT-2021-14716 · Jenkins · Jenkins Cas Plugin+1

Wadeck Follonier · Published 2021-06-30 · Updated 2023-10-25 · CVE-2021-21673

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Jenkins CAS Plugin versions 1.6.0 and earlier

Description The issue improperly determines that a redirect URL after login is legitimately pointing to Jenkins, allowing attackers to perform phishing attacks by having users go to a Jenkins URL that will forward them to a different site after successful authentication.

Recommendations For Jenkins CAS Plugin versions 1.6.0 and earlier, update to version 1.6.1 or later, which only redirects to relative Jenkins URLs, mitigating the phishing attack risk.

Fix

Open Redirect

Weakness Enumeration

CWE-601

Related Identifiers

CVE-2021-21673

GHSA-2VVR-5757-QP87

Affected Products

Jenkins

Jenkins Cas Plugin

References · 9

• https://jenkins.io/security/advisory/2021-06-30/#SECURITY-2387 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21673 · Security Note
• https://osv.dev/vulnerability/CVE-2021-21673 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-2vvr-5757-qp87 · Vendor Advisory
• https://github.com/jenkinsci/cas-plugin · Note
• https://github.com/jenkinsci/cas-plugin/commit/8ac536a953156160dbabb61bdb3b9bc75c3d0ef9 · Note
• http://openwall.com/lists/oss-security/2021/06/30/1 · Note
• https://t.me/cvenotify/17158 · Telegram Post
• https://t.me/cvenotify/16943 · Telegram Post