PT-2021-14703 · Jenkins · Jenkins Markdown Formatter Plugin+1

Published 2021-05-25 · Updated 2023-11-03 · CVE-2021-21660

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Jenkins Markdown Formatter Plugin versions 0.1.0 and earlier

Description The issue results from the plugin's failure to sanitize crafted link target URLs, leading to a stored cross-site scripting (XSS) vulnerability. This vulnerability can be exploited by attackers who have the ability to edit descriptions rendered using the configured markup formatter. The plugin uses a Markdown library that does not escape crafted link target URLs, causing the vulnerability.

Recommendations For Jenkins Markdown Formatter Plugin versions 0.1.0 and earlier, update to version 0.2.0 or later, which uses a different Markdown library that is not affected by this problem.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2021-21660

GHSA-XQPP-26PP-2365

Affected Products

Jenkins

Jenkins Markdown Formatter Plugin

References · 8

• https://jenkins.io/security/advisory/2021-05-25/#SECURITY-2198 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21660 · Security Note
• https://osv.dev/vulnerability/GHSA-xqpp-26pp-2365 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21660 · Vendor Advisory
• https://github.com/jenkinsci/markdown-formatter-plugin · Note
• https://github.com/jenkinsci/markdown-formatter-plugin/commit/6b283a5bba3424fd5174b92e7ad8724cdbdf596c · Note
• http://openwall.com/lists/oss-security/2021/05/25/3 · Note
• https://whitesourcesoftware.com/vulnerability-database/CVE-2021-21660 · Note