========================================================================== Ubuntu Security Notice USN-6138-1 June 05, 2023 libssh vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 23.04 - Ubuntu 22.10 - 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: Philip Turnbull discovered that libssh incorrectly handled rekeying with algorithm guessing. A remote attacker could use this issue to cause libssh to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2023-1667) Kevin Backhouse discovered that libssh incorrectly handled verifying data signatures. A remote attacker could possibly use this issue to bypass authorization. (CVE-2023-2283) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 23.04: libssh-4 0.10.4-2ubuntu0.1 Ubuntu 22.10: libssh-4 0.9.6-2ubuntu0.22.10.1 Ubuntu 22.04 LTS: libssh-4 0.9.6-2ubuntu0.22.04.1 Ubuntu 20.04 LTS: libssh-4 0.9.3-2ubuntu2.3 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6138-1 CVE-2023-1667, CVE-2023-2283 Package Information: https://launchpad.net/ubuntu/+source/libssh/0.10.4-2ubuntu0.1 https://launchpad.net/ubuntu/+source/libssh/0.9.6-2ubuntu0.22.10.1 https://launchpad.net/ubuntu/+source/libssh/0.9.6-2ubuntu0.22.04.1 https://launchpad.net/ubuntu/+source/libssh/0.9.3-2ubuntu2.3