CVE-2018-25021

The TCP Server module in toxcore before 0.2.8 doesnt free the TCP priority queue under certain conditions, which allows a remote attacker to exhaust the systems memory, causing a denial of service (DoS).

Weakness

The product does not release or incorrectly releases a resource before it is made available for re-use.

Affected Software

Potential Mitigations

• Use a language that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
• For example, languages such as Java, Ruby, and Lisp perform automatic garbage collection that releases memory for objects that have been deallocated.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/125.html
• https://cwe.mitre.org/data/definitions/130.html
• https://cwe.mitre.org/data/definitions/131.html
• https://cwe.mitre.org/data/definitions/494.html
• https://cwe.mitre.org/data/definitions/495.html
• https://cwe.mitre.org/data/definitions/496.html
• https://cwe.mitre.org/data/definitions/666.html

References

• https://blog.tox.chat/2018/10/memory-leak-bug-and-new-toxcore-release-fixing-it/
• https://github.com/TokTok/c-toxcore/issues/1214
• https://github.com/TokTok/c-toxcore/pull/1216