========================================================================== Ubuntu Security Notice USN-7270-2 February 18, 2025
openssh vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
Summary:
OpenSSH could be made to bypass the server identity check.
Software Description:
- 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)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS
openssh-client 1:7.6p1-4ubuntu0.7+esm4
Available with Ubuntu Pro
openssh-server 1:7.6p1-4ubuntu0.7+esm4
Available with Ubuntu Pro
Ubuntu 16.04 LTS
openssh-client 1:7.2p2-4ubuntu2.10+esm7
Available with Ubuntu Pro
openssh-server 1:7.2p2-4ubuntu2.10+esm7
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-7270-2
https://ubuntu.com/security/notices/USN-7270-1
CVE-2025-26465
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