CVE-2024-49769
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.38%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 1.38% probability · 71th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-772
- Affected
- agendaless/waitress
- Source
- security-advisories@github.com
References
- https://github.com/Pylons/waitress/commit/1ae4e894c9f76543bee06584001583fc6fa8c95cPatch
- https://github.com/Pylons/waitress/issues/418Issue Tracking
- https://github.com/Pylons/waitress/pull/435Patch
- https://github.com/Pylons/waitress/security/advisories/GHSA-3f84-rpwh-47g6Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/11/msg00012.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.