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Ubuntu 18.04 LTS USN-7270-2 Critical: OpenSSH Identity Bypass

ubuntu
Calendar Grey February 18, 2025
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-7280-1 addresses a vulnerability in OpenSSL that could permit unauthorized data access.
OpenSSH could be made to bypass the server identity check.

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)

Topics%20covered

Topics Covered

security advisory update information critical threat openssh ubuntu OpenSSH bypass Ubuntu 16.04 Ubuntu 18.04 server identity identity check server identity check

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7270-2

Topics%20covered

Topics Covered

security advisory update information critical threat openssh ubuntu OpenSSH bypass Ubuntu 16.04 Ubuntu 18.04 server identity identity check server identity check

Package Information

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