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USN-6242-1: OpenSSH vulnerability

24 July 2023

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

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 23.04
Ubuntu 22.04
Ubuntu 20.04

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

References

Related notices

  • USN-6242-2: openssh-sftp-server, openssh, openssh-client-ssh1, openssh-server, openssh-client, ssh-askpass-gnome, ssh, ssh-krb5