1. Ubuntu Security Notices
  2. USN-7270-2

USN-7270-2: OpenSSH vulnerability

Publication date

18 February 2025

Overview

OpenSSH could be made to bypass the server identity check.

Releases

Packages

  • openssh - secure shell (SSH) for secure access to remote machines

Details

USN-7270-1 fixed a vulnerability in OpenSSH. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

It was discovered that the OpenSSH client incorrectly handled the
non-default VerifyHostKeyDNS option. If that option were enabled, an
attacker could possibly impersonate a server by completely bypassing the
server identity check. (CVE-2025-26465)

USN-7270-1 fixed a vulnerability in OpenSSH. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

It was discovered that the OpenSSH client incorrectly handled the
non-default VerifyHostKeyDNS option. If that option were enabled, an
attacker could possibly impersonate a server by completely bypassing the
server identity check. (CVE-2025-26465)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
18.04 bionic openssh-client –  1:7.6p1-4ubuntu0.7+esm4  
openssh-server –  1:7.6p1-4ubuntu0.7+esm4  
16.04 xenial openssh-client –  1:7.2p2-4ubuntu2.10+esm7  
openssh-server –  1:7.2p2-4ubuntu2.10+esm7  

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References

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