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Ubuntu Security Notice USN-6859-1
July 01, 2024

openssh vulnerability
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 23.10
- Ubuntu 22.04 LTS

Summary:

OpenSSH could be made to bypass authentication and remotely
access systems without proper credentials.

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

Details:

It was discovered that OpenSSH incorrectly handled signal management. A
remote attacker could use this issue to bypass authentication and remotely
access systems without proper credentials.

Update instructions:

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

Ubuntu 24.04 LTS
  openssh-client                  1:9.6p1-3ubuntu13.3
  openssh-server                  1:9.6p1-3ubuntu13.3

Ubuntu 23.10
  openssh-client                  1:9.3p1-1ubuntu3.6
  openssh-server                  1:9.3p1-1ubuntu3.6

Ubuntu 22.04 LTS
  openssh-client                  1:8.9p1-3ubuntu0.10
  openssh-server                  1:8.9p1-3ubuntu0.10

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

References:
  https://ubuntu.com/security/notices/USN-6859-1
  CVE-2024-6387

Package Information:
  https://launchpad.net/ubuntu/+source/openssh/1:9.6p1-3ubuntu13.3
  https://launchpad.net/ubuntu/+source/openssh/1:9.3p1-1ubuntu3.6
  https://launchpad.net/ubuntu/+source/openssh/1:8.9p1-3ubuntu0.10