1. Ubuntu Security Notices
  2. USN-6242-1

USN-6242-1: OpenSSH vulnerability

Publication date

24 July 2023

Overview

OpenSSH could be made to run programs as your login when using ssh-agent forwarding.

Releases

Packages

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

Details

It was discovered that OpenSSH incorrectly handled loading certain PKCS#11
providers. If a user forwarded their ssh-agent to an untrusted system, a
remote attacker could possibly use this issue to load arbitrary libraries
from the user’s system and execute arbitrary code.

It was discovered that OpenSSH incorrectly handled loading certain PKCS#11
providers. If a user forwarded their ssh-agent to an untrusted system, a
remote attacker could possibly use this issue to load arbitrary libraries
from the user’s system and execute arbitrary code.

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
23.04 lunar openssh-client –  1:9.0p1-1ubuntu8.4
22.04 jammy openssh-client –  1:8.9p1-3ubuntu0.3
20.04 focal openssh-client –  1:8.2p1-4ubuntu0.8

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References

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