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AUSCERT External Security Bulletin Redistribution
ESB-2021.1361
Jenkins Security Advisory 2021-04-20
21 April 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: Denial of Service -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-28165
Original Bulletin:
https://www.jenkins.io/security/advisory/2021-04-20/
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Jenkins Security Advisory 2021-04-20
This advisory announces vulnerabilities in the following Jenkins deliverables:
o Jenkins (core)
Descriptions
Denial of service vulnerability in bundled Jetty
JENKINS-65280 / CVE-2021-28165
Jenkins bundles Winstone-Jetty, a wrapper around Jetty, to act as HTTP and
servlet server when started using java -jar jenkins.war. This is how Jenkins is
run when using any of the installers or packages, but not when run using
servlet containers such as Tomcat.
Jenkins 2.285 and earlier, LTS 2.277.2 and earlier bundles Jetty 9.4.38 or
earlier with multiple security vulnerabilities, including CVE-2021-28165. This
vulnerability may allow unauthenticated attackers to cause a denial of service
if Winstone-Jetty is configured to handle SSL/TLS connections.
Jenkins LTS 2.277.3 updates the bundled Jetty to 9.4.39. Jetty was already
previously updated to 9.4.39 in the 2.286 weekly release.
Severity
o JENKINS-65280: High
Affected Versions
o Jenkins weekly up to and including 2.285
o Jenkins LTS up to and including 2.277.2
Fix
o Jenkins weekly should be updated to version 2.286
o Jenkins LTS should be updated to version 2.277.3
These versions include fixes to the vulnerabilities described above. All prior
versions are considered to be affected by these vulnerabilities unless
otherwise indicated.
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The University of Queensland
Brisbane
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Internet Email: auscert@auscert.org.au
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