==========================================================================
Ubuntu Security Notice USN-6592-1
January 22, 2024

libssh vulnerabilities
==========================================================================

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

- Ubuntu 23.10
- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in libssh.

Software Description:
- libssh: A tiny C SSH library

Details:

It was discovered that libssh incorrectly handled the ProxyCommand and the
ProxyJump features. A remote attacker could possibly use this issue to
inject malicious code into the command of the features mentioned through
the hostname parameter. (CVE-2023-6004)

It was discovered that libssh incorrectly handled return codes when
performing message digest operations. A remote attacker could possibly use
this issue to cause libssh to crash, obtain sensitive information, or
execute arbitrary code. (CVE-2023-6918)

Update instructions:

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

Ubuntu 23.10:
   libssh-4                        0.10.5-3ubuntu1.2

Ubuntu 23.04:
   libssh-4                        0.10.4-2ubuntu0.3

Ubuntu 22.04 LTS:
   libssh-4                        0.9.6-2ubuntu0.22.04.3

Ubuntu 20.04 LTS:
   libssh-4                        0.9.3-2ubuntu2.5

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

References:
   https://ubuntu.com/security/notices/USN-6592-1
   CVE-2023-6004, CVE-2023-6918

Package Information:
   https://launchpad.net/ubuntu/+source/libssh/0.10.5-3ubuntu1.2
   https://launchpad.net/ubuntu/+source/libssh/0.10.4-2ubuntu0.3
   https://launchpad.net/ubuntu/+source/libssh/0.9.6-2ubuntu0.22.04.3
   https://launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.5