Ubuntu alert USN-6242-1 (openssh)

From:
             
 
Marc Deslauriers <marc.deslauriers@canonical.com>
To:
             
 
"ubuntu-security-announce@lists.ubuntu.com" <ubuntu-security-announce@lists.ubuntu.com>
Subject:
             
 
[USN-6242-1] OpenSSH vulnerability
Date:
             
 
Mon, 24 Jul 2023 14:52:33 -0400
Message-ID:
             
 
<ae901e07-3f57-f0fe-1cba-7515af22d400@canonical.com>
==========================================================================
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

Summary:

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

Software Description:
- 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.

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.

References:
   https://ubuntu.com/security/notices/USN-6242-1
   CVE-2023-38408

Package Information:
   https://launchpad.net/ubuntu/+source/openssh/1:9.0p1-1ubu...
   https://launchpad.net/ubuntu/+source/openssh/1:8.9p1-3ubu...
   https://launchpad.net/ubuntu/+source/openssh/1:8.2p1-4ubu...