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AUSCERT External Security Bulletin Redistribution
ESB-2021.0656
Jenkins Security Advisory 2021-02-19
22 February 2021
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AusCERT Security Bulletin Summary
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Product: Jenkins Core
Publisher: Jenkins
Operating System: Windows
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-22112
Original Bulletin:
https://www.jenkins.io/security/advisory/2021-02-19/
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Jenkins Security Advisory 2021-02-19
This advisory announces vulnerabilities in the following Jenkins deliverables:
o Jenkins (core)
Descriptions
Privilege escalation vulnerability in bundled Spring Security library
SECURITY-2195 / CVE-2021-22112
Spring Security 5.4.3 and earlier has a vulnerability that unintentionally
persisted temporarily elevated privileges in some circumstances in a user's
session. This issue, CVE-2021-22112, is resolved in Spring Security 5.4.4.
Jenkins 2.266 through 2.279 (inclusive) included releases of Spring Security
with this vulnerability.
We are aware of a sequence of operations in Jenkins 2.275 through 2.278
(inclusive) that allows attackers with Job/Workspace permission to exploit this
to switch their identity to SYSTEM, an internal user with all permissions.
Jenkins 2.280 integrates Spring Security 5.4.4, which includes a fix for
CVE-2021-22112.
We recommend that all Jenkins instances running Jenkins releases 2.266 through
2.279 (inclusive) are upgraded to 2.280. Administrators of instances running
Jenkins releases 2.275 through 2.278 (inclusive) who cannot upgrade to a fixed
version are advised to apply the short-term workaround of removing Job/
Workspace permission from all non-admin users.
Severity
o SECURITY-2195: High
Affected Versions
o Jenkins weekly up to and including 2.279
Fix
o Jenkins weekly should be updated to version 2.280
These versions include fixes to the vulnerabilities described above. All prior
versions are considered to be affected by these vulnerabilities unless
otherwise indicated.
Credit
The Jenkins project would like to thank the reporters for discovering and
reporting these vulnerabilities:
o Daniel Beck, CloudBees, Inc. and Wadeck Follonier, CloudBees, Inc. for
SECURITY-2195
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