CVE-2021-27229

Mumble before 1.3.4 allows remote code execution if a victim navigates to a crafted URL on a server list and clicks on the Open Webpage text.

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://github.com/mumble-voip/mumble/commit/e59ee87abe249f345908c7d568f6879d16bfd648
• https://github.com/mumble-voip/mumble/compare/1.3.3...1.3.4
• https://github.com/mumble-voip/mumble/pull/4733
• https://lists.debian.org/debian-lts-announce/2021/02/msg00022.html
• https://security.gentoo.org/glsa/202105-13