[USN-5053-1] libssh vulnerability

========================================================================== Ubuntu Security Notice USN-5053-1 August 26, 2021
libssh vulnerability ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 21.04 – Ubuntu 20.04 LTS
Summary:
libssh could be made to crash or run programs if it received specially crafted network traffic.
Software Description: – libssh: A tiny C SSH library
Details:
It was discovered that libssh incorrectly handled rekeying. A remote attacker could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code.
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 21.04: libssh-4 0.9.5-1ubuntu0.1
Ubuntu 20.04 LTS: libssh-4 0.9.3-2ubuntu2.2
In general, a standard system update will make all the necessary changes.
References: ubuntu.com/security/notices/USN-5053-1 CVE-2021-3634
Package Information: launchpad.net/ubuntu/+source/libssh/0.9.5-1ubuntu0.1 launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.2