GitHub Advisoryadvisory · PyPI

GHSA-3f84-rpwh-47g6 Waitress vulnerable to DoS leading to high CPU usage/resource exhaustion

HIGH Published 2024-10-29 Modified 2025-01-21 Official page ↗
Aliases
CVE-2024-49769
Ecosystem
PyPI
Packages
waitress
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-772
Reviewed
2024-10-29

Affected packages

• PyPI waitress: < 3.0.1 → fixed in 3.0.1

Description

Impact 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. Patches Waitress 3.0.1 contains fixes that remove the race condition. Workarounds No work-around. References • https://github.com/Pylons/waitress/issues/418 • https://github.com/Pylons/waitress/pull/435

Related

Alias · CVE (1)

  • CVE-2024-49769 Waitress is a Web Server Gateway Interface server for Python 2 and 3. vulnerability

Weakness · CWE (1)

  • CWE-772 Missing Release of Resource after Effective Lifetime weakness

References