high
7.5
CWE
772 362
Advisory Published
Advisory Published
Updated

CVE-2024-49769: Waitress has a denial of service leading to high CPU usage/resource exhaustion

First published: Tue Oct 29 2024(Updated: )

### 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

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
debian/waitress<=1.4.4-1.1+deb11u1<=2.1.2-2
1.4.4-1.1+deb11u2
3.0.2-1
pip/waitress<3.0.1
3.0.1
Waitress<3.0.1

Remedy

https://github.com/Pylons/waitress/commit/1ae4e894c9f76543bee06584001583fc6fa8c95c

Remedy

https://github.com/Pylons/waitress/pull/435

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2024-49769?

    CVE-2024-49769 has been classified as a moderate severity vulnerability due to potential denial of service risks.

  • How do I fix CVE-2024-49769?

    To fix CVE-2024-49769, users should upgrade their Waitress package to version 1.4.4-1.1+deb11u2 or later from Debian, or version 3.0.2 or later from pip.

  • Which versions of Waitress are affected by CVE-2024-49769?

    CVE-2024-49769 affects Waitress versions up to and including 1.4.4-1.1+deb11u1 for Debian and versions prior to 3.0.2 for pip.

  • Is CVE-2024-49769 remotely exploitable?

    Yes, CVE-2024-49769 can be exploited remotely due to its nature involving client-server communications.

  • What type of vulnerability is CVE-2024-49769?

    CVE-2024-49769 is classified as a resource management vulnerability that can lead to improper handling of socket connections.

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