Debian LTS Advisory ([SECURITY] [DLA 2056-1] waitress security update)

Published: 2020-01-02 03:00:08

CVSS Base Vector:
AV:N/AC:L/Au:N/C:P/I:N/A:N

Summary:
The remote host is missing an update for the 'waitress' Linux Distribution Package(s) announced via the DSA-2056-1 advisory.

Detection Method:
Checks if a vulnerable Linux Distribution Package version is present on the target host.

Technical Details:
It was discovered that there was a HTTP request smuggling vulnerability in waitress, pure-Python WSGI server. If a proxy server is used in front of waitress, an invalid request may be sent by an attacker that bypasses the front-end and is parsed differently by waitress leading to a potential for request smuggling. Specially crafted requests containing special whitespace characters in the Transfer-Encoding header would get parsed by Waitress as being a chunked request, but a front-end server would use the Content-Length instead as the Transfer-Encoding header is considered invalid due to containing invalid characters. If a front-end server does HTTP pipelining to a backend Waitress server this could lead to HTTP request splitting which may lead to potential cache poisoning or information disclosure.

Affected Versions:
'waitress' Linux Distribution Package(s) on Debian Linux.

Recommendations:
For Debian 8 'Jessie', this issue has been fixed in waitress version 0.8.9-2+deb8u1. We recommend that you upgrade your waitress Linux Distribution Packages.

Solution Type:
Vendor Patch

Detection Type:
Linux Distribution Package

References:

https://lists.debian.org/debian-lts-announce/2020/01/msg00002.html
https://security-tracker.debian.org/tracker/DLA-2056-1
https://bugs.debian.org/765126

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Severity
Medium
CVSS Score
5.0

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