CVE-2022-3592

A symlink following vulnerability was found in Samba, where a user can create a symbolic link that will make smbd escape the configured share path. This flaw allows a remote user with access to the exported part of the file system under a share via SMB1 unix extensions or NFS to create symlinks to files outside the smbd configured share path and gain access to another restricted servers filesystem.

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

• https://access.redhat.com/security/cve/CVE-2022-3592
• https://bugzilla.redhat.com/show_bug.cgi?id=2137776
• https://security.gentoo.org/glsa/202309-06
• https://www.samba.org/samba/security/CVE-2022-3592.html