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2024-066: Critical Vulnerability in OpenSSH ↗ source

July 9, 2024 CERT-EU Advisory

Summary

This vulnerability, identified as CVE-2024-6387, allows remote attackers to execute arbitrary code as root due to a signal handler race condition in sshd [1]. This vulnerability, if exploited, could lead to full-system compromise, where an attacker can execute arbitrary code with the highest privileges, resulting in a complete system takeover, installation of malware, data manipulation, and the creation of backdoors for persistent access. It could facilitate network propagation, allowing attackers to use a compromised system as a foothold to traverse and exploit other vulnerable systems within the organisation [2]. The regreSSHion flaw impacts OpenSSH servers on Linux from version 8.5p1 up to, but not Versions 4.4p1 up to, but not including 8.5p1 are not vulnerable to CVE-2024-6387 thanks to a patch for CVE-2006-5051, which secured a previously unsafe function [1]. Versions older than 4.4p1 are vulnerable to regreSSHion unless they are patched for CVE-20065051 and CVE-2008-4109.

News Coverage

No coverage found in monitored research blogs or news feeds.

CVEs Referenced in This Publication

CVECVSSAffected
CVE-2024-6387 8.1 High — A security regression (CVE-2006-5051) was discovered in OpenSSH's server (sshd). There is a race condition which can lead sshd to handle some signals…
CVE-2006-5051 — n/a n/a Signal handler race condition in OpenSSH before 4.4 allows remote attackers to cause a denial of service (crash), and possibly execute arbitrary code…
CVE-2008-4109 — n/a n/a A certain Debian patch for OpenSSH before 4.3p2-9etch3 on etch; before 4.6p1-1 on sid and lenny; and on other distributions such as SUSE uses functio…

Extracted from the publication text. Each CVE links to its tracked detail page.

Vendors Named in This Publication

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.