[USN-6242-1] OpenSSH vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Mon Jul 24 18:52:33 UTC 2023

Ubuntu Security Notice USN-6242-1
July 24, 2023

openssh vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS


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

Software Description:
- openssh: secure shell (SSH) for secure access to remote machines


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:

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

Ubuntu 23.04:
   openssh-client                  1:9.0p1-1ubuntu8.4

Ubuntu 22.04 LTS:
   openssh-client                  1:8.9p1-3ubuntu0.3

Ubuntu 20.04 LTS:
   openssh-client                  1:8.2p1-4ubuntu0.8

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


Package Information:

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