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

USN-7270-1: OpenSSH vulnerabilities

Publication date

18 February 2025

Overview

Several security issues were fixed in OpenSSH.

Releases

Packages

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

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)

It was discovered that OpenSSH incorrectly handled the transport-level ping
facility. A remote attacker could possibly use this issue to cause OpenSSH
clients and servers to consume resources, leading to a denial of service.
This issue only affected Ubuntu 24.04 LTS and Ubuntu 24.10.
(CVE-2025-26466)

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)

It was discovered that OpenSSH incorrectly handled the transport-level ping
facility. A remote attacker could possibly use this issue to cause OpenSSH
clients and servers to consume resources, leading to a denial of service.
This issue only affected Ubuntu 24.04 LTS and Ubuntu 24.10.
(CVE-2025-26466)

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
24.10 oracular openssh-client –  1:9.7p1-7ubuntu4.2
openssh-server –  1:9.7p1-7ubuntu4.2
24.04 noble openssh-client –  1:9.6p1-3ubuntu13.8
openssh-server –  1:9.6p1-3ubuntu13.8
22.04 jammy openssh-client –  1:8.9p1-3ubuntu0.11
openssh-server –  1:8.9p1-3ubuntu0.11
20.04 focal openssh-client –  1:8.2p1-4ubuntu0.12
openssh-server –  1:8.2p1-4ubuntu0.12

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References

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