Description
Waitress is a Web Server Gateway Interface server for Python 2 and 3. When a remote client closes the connection before waitress has had the opportunity to call getpeername() waitress won't correctly clean up the connection leading to the main thread attempting to write to a socket that no longer exists, but not removing it from the list of sockets to attempt to process. This leads to a busy-loop calling the write function. A remote attacker could run waitress out of available sockets with very little resources required. Waitress 3.0.1 contains fixes that remove the race condition.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Pylons waitress
< 3.0.1affected
References
- https://github.com/Pylons/waitress/security/advisories/GHSA-3f84-rpwh-47g6 ↗
- https://github.com/Pylons/waitress/issues/418 ↗
- https://github.com/Pylons/waitress/pull/435 ↗
- https://github.com/Pylons/waitress/commit/1ae4e894c9f76543bee06584001583fc6fa8c95c ↗
- https://lists.debian.org/debian-lts-announce/2024/11/msg00012.html ↗