CVE-2022-41973

multipath-tools 0.7.7 through 0.9.x before 0.9.2 allows local users to obtain root access, as exploited in conjunction with CVE-2022-41974. Local users able to access /dev/shm can change symlinks in multipathd due to incorrect symlink handling, which could lead to controlled file writes outside of the /dev/shm directory. This could be used indirectly for local privilege escalation to root.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• http://packetstormsecurity.com/files/169611/Leeloo-Multipath-Authorization-Bypass-Symlink-Attack.html
• http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
• http://seclists.org/fulldisclosure/2022/Dec/4
• http://seclists.org/fulldisclosure/2022/Oct/25
• http://www.openwall.com/lists/oss-security/2022/10/24/2
• http://www.openwall.com/lists/oss-security/2022/11/30/2
• https://bugzilla.suse.com/show_bug.cgi?id=1202739
• https://github.com/opensvc/multipath-tools/releases/tag/0.9.2
• https://lists.debian.org/debian-lts-announce/2022/12/msg00037.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QIGZM5NOOMFDCITOLQEJNNX5SCRQLQVV/
• https://security.gentoo.org/glsa/202311-06
• https://www.debian.org/security/2023/dsa-5366
• https://www.qualys.com/2022/10/24/leeloo-multipath/leeloo-multipath.txt