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Access Restriction Bypass Affecting org.jenkins-ci.main:jenkins-core package, versions [,2.263.2) [2.270,2.275)

0.0
low

Snyk CVSS

    Attack Complexity High

    Threat Intelligence

    EPSS 0.08% (35th percentile)
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NVD
5.3 medium
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Red Hat
5.3 medium

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  • Snyk ID SNYK-JAVA-ORGJENKINSCIMAIN-1062704
  • published 20 Jan 2021
  • disclosed 19 Jan 2021
  • credit Daniel Beck, CloudBees, Inc.
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Introduced: 19 Jan 2021

CVE-2021-21609 Open this link in a new tab
CWE-284 Open this link in a new tab

How to fix?

Upgrade org.jenkins-ci.main:jenkins-core to version 2.263.2, 2.275 or higher.

Overview

org.jenkins-ci.main:jenkins-core is an open source automation server.

Affected versions of this package are vulnerable to Access Restriction Bypass. Jenkins includes a static list of URLs that are always accessible even without Overall/Read permission, such as the login form. These URLs are excluded from an otherwise universal permission check.

Jenkins does not correctly compare requested URLs with that list.This allows attackers without Overall/Read permission to access plugin-provided URLs with any of the following prefixes if no other permissions are required. For example, a plugin contributing the path.

The Jenkins security team is not aware of any affected plugins as of the publication of this advisory.