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Jenkins Security Advisory 2022-09-09

This advisory announces vulnerabilities in the following Jenkins deliverables:

  • Jenkins (core)

Descriptions

HTTP/2 denial of service vulnerability in bundled Jetty

SECURITY-2868 / CVE-2022-2048
Severity (CVSS): High
Description:

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 LTS 2.346.3 and earlier, 2.362 and earlier bundle versions of Jetty affected by the security vulnerability CVE-2022-2048. This vulnerability allows unauthenticated attackers to make the Jenkins UI unresponsive by exploiting Jetty’s handling of invalid HTTP/2 requests, causing a denial of service.

This only affects instances that enable HTTP/2, typically using the --http2Port argument to java -jar jenkins.war or corresponding options in service configuration files. It is disabled by default in all native installers and the Docker images provided by the Jenkins project.

Jenkins LTS 2.361.1 updates the bundled Jetty to version 10.0.11, which is unaffected by this issue.

Jetty was already previously updated to version 10.0.11 in the 2.363 weekly release.

Administrators unable to update to these releases of Jenkins (or newer) are advised to disable HTTP/2.

This advisory has been updated to correctly reference Jenkins versions 2.363 and 2.361.1.

Severity

Affected Versions

  • Jenkins weekly up to and including 2.362
  • Jenkins LTS up to and including 2.346.3

Fix

  • Jenkins weekly should be updated to version 2.363
  • Jenkins LTS should be updated to version 2.361.1

These versions include fixes to the vulnerabilities described above. All prior versions are considered to be affected by these vulnerabilities unless otherwise indicated.