========================================================================== 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: https://ubuntu.com/security/notices/USN-5053-1 CVE-2021-3634 Package Information: https://launchpad.net/ubuntu/+source/libssh/0.9.5-1ubuntu0.1 https://launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.2