USN-7270-2: OpenSSH vulnerability

18 February 2025

OpenSSH could be made to bypass the server identity check.

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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)

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04

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

References

Related notices

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