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Ubuntu Security Notice USN-6242-1

Ubuntu Security Notice 6242-1 - 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.

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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/1:9.0p1-1ubuntu8.4
https://launchpad.net/ubuntu/+source/openssh/1:8.9p1-3ubuntu0.3
https://launchpad.net/ubuntu/+source/openssh/1:8.2p1-4ubuntu0.8

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