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CVE-2024-6387 – OpenSSH Unauthenticated Remote Code Execution (regreSSHion)

CVE-2024-6387, also known as regreSSHion, is an unauthenticated remote code execution vulnerability in OpenSSH’s server that grants full root access. It affects the default configuration and does not require user interaction. It poses a significant exploit risk. A crude public exploit does exist for 32-bit systems, but not 64-bit systems.

This vulnerability is a regression of the previously patched vulnerability CVE-2006-5051, reported and fixed in 2006. Due to this uncommon vector of a code regression (re)creating a vulnerability, the versions of OpenSSH sshd are affected is strange: Versions earlier than 4.4p1 are vulnerable unless they have already been patched for CVE-2006-5051 and CVE-2008-4109. Versions from 4.4p1 up to, but not including, 8.5p1 are not vulnerable. Versions from 8.5p1 up to, but not including, 9.8p1 vulnerable.

To resolve the issue, upgrade to the latest version of OpenSSH.

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