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Jenkins Security Advisory 2024-04-17

This advisory announces vulnerabilities in the following Jenkins deliverables:

  • Jenkins (core)

Descriptions

Terrapin SSH vulnerability in Jenkins CLI client

SECURITY-3386 / CVE-2023-48795
Severity (CVSS): Medium
Description:

The CLI client (jenkins-cli.jar) in Jenkins 2.451 and earlier, LTS 2.440.2 and earlier bundles versions of the Apache MINA SSHD library that are susceptible to CVE-2023-48795 (Terrapin attack). This vulnerability allows a machine-in-the-middle attacker to reduce the security of an SSH connection.

This only affects the Jenkins CLI client when using the -ssh connection mode, which is not the default.

The CLI client (jenkins-cli.jar) in Jenkins 2.452, LTS 2.440.3 bundles version 2.12.1 of the Apache MINA SSHD library, which is unaffected by this issue.

Severity

Affected Versions

  • Jenkins weekly up to and including 2.451
  • Jenkins LTS up to and including 2.440.2

Fix

  • Jenkins weekly should be updated to version 2.452
  • Jenkins LTS should be updated to version 2.440.3

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