Ecosyste.ms: Advisories

Security Advisories: GSA_kwCzR0hTQS03cWYzLWMycTgtNjltM84AAnOa

Reflected XSS vulnerability in Jenkins markup formatter preview

Jenkins allows administrators to choose the markup formatter to use for descriptions of jobs, builds, views, etc. displayed in Jenkins. When editing such a description, users can choose to have Jenkins render a formatted preview of the description they entered.

Jenkins 2.274 and earlier, LTS 2.263.1 and earlier does not implement any restrictions for the URL rendering the formatted preview of markup passed as a query parameter. This results in a reflected cross-site scripting (XSS) vulnerability if the configured markup formatter does not prohibit unsafe elements (JavaScript) in markup, like Anything Goes Formatter Plugin.

Jenkins 2.275, LTS 2.263.2 requires that preview URLs are accessed using POST and sets Content-Security-Policy headers that prevent execution of unsafe elements when the URL is accessed directly.

In case of problems with this change, these protections can be disabled by setting the Java system properties hudson.markup.MarkupFormatter.previewsAllowGET to true and/or hudson.markup.MarkupFormatter.previewsSetCSP to false. Doing either is discouraged.

Permalink: https://github.com/advisories/GHSA-7qf3-c2q8-69m3
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS03cWYzLWMycTgtNjltM84AAnOa
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: over 2 years ago
Updated: 11 months ago

CVSS Score: 6.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Identifiers: GHSA-7qf3-c2q8-69m3, CVE-2021-21610
References:

• https://nvd.nist.gov/vuln/detail/CVE-2021-21610
• https://www.jenkins.io/security/advisory/2021-01-13/#SECURITY-2153
• https://github.com/jenkinsci/jenkins/commit/89ec0c40b68cd1e4e9f9ef5ebcafd87e7fa16589
• https://github.com/advisories/GHSA-7qf3-c2q8-69m3

Repository: https://github.com/jenkinsci/jenkins
Blast Radius: 1.0

Affected Packages