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Security Advisories: GSA_kwCzR0hTQS0zZjg0LXJwd2gtNDdnNs4ABAxp

Waitress vulnerable to DoS leading to high CPU usage/resource exhaustion

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

Permalink: https://github.com/advisories/GHSA-3f84-rpwh-47g6
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS0zZjg0LXJwd2gtNDdnNs4ABAxp
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: 9 days ago
Updated: 8 days ago


CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Identifiers: GHSA-3f84-rpwh-47g6, CVE-2024-49769
References: Repository: https://github.com/Pylons/waitress
Blast Radius: 33.0

Affected Packages

pypi:waitress
Dependent packages: 326
Dependent repositories: 25,180
Downloads: 5,314,368 last month
Affected Version Ranges: < 3.0.1
Fixed in: 3.0.1
All affected versions: 0.6.1, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.8.5, 0.8.6, 0.8.7, 0.8.8, 0.8.9, 0.8.10, 0.9.0, 1.0.0, 1.0.1, 1.0.2, 1.1.0, 1.2.0, 1.2.1, 1.3.0, 1.3.1, 1.4.0, 1.4.1, 1.4.2, 1.4.3, 1.4.4, 2.0.0, 2.1.0, 2.1.1, 2.1.2, 3.0.0
All unaffected versions: 3.0.1