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Ubuntu 18.04 LTS USN-7270-2 Critical: OpenSSH Identity Bypass

OpenSSH could be made to bypass the server identity check.. ========================================================================== Ubuntu Security Notice USN-7270-2 February 18, 2025 openssh vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: OpenSSH could be made to bypass the server identity check. Software Description: - openssh: secure shell (SSH) for secure access to remote machines Details: USN-7270-1 fixed a vulnerability in OpenSSH. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: It was discovered that the OpenSSH client incorrectly handled the non-default VerifyHostKeyDNS option. If that option were enabled, an attacker could possibly impersonate a server by completely bypassing the server identity check. (CVE-2025-26465) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS openssh-client 1:7.6p1-4ubuntu0.7+esm4 Available with Ubuntu Pro openssh-server 1:7.6p1-4ubuntu0.7+esm4 Available with Ubuntu Pro Ubuntu 16.04 LTS openssh-client 1:7.2p2-4ubuntu2.10+esm7 Available with Ubuntu Pro openssh-server 1:7.2p2-4ubuntu2.10+esm7 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-7270-2 https://ubuntu.com/security/notices/USN-7270-1 CVE-2025-26465 . Ubuntu Security Notice USN-7280-1 addresses a vulnerability in OpenSSL that could permit unauthorized data access.. OpenSSH Security Advisory, Ubuntu Server Identity, SSH Threat. . Severity: Critical. LinuxSecurity.com Team

Feb 18, 2025 •Critical Ubuntu