CVE-2024-49769: waitress — Fix

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.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-772 CWE-772

Affected Products

Vendor	Product	Versions
agendaless	waitress	< 3.0.1

References

Advisories & Patches

https://github.com/Pylons/waitress/commit/1ae4e894c9f76543bee06584001583fc6fa8c95c https://github.com/Pylons/waitress/pull/435 https://github.com/Pylons/waitress/security/advisories/GHSA-3f84-rpwh-47g6

Other References

https://github.com/Pylons/waitress/issues/418 https://lists.debian.org/debian-lts-announce/2024/11/msg00012.html

Frequently Asked Questions

What is CVE-2024-49769? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2024-49769? +

CVE-2024-49769 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-49769? +

CVE-2024-49769 affects products from agendaless, specifically: waitress. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-49769? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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