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Debian LTS Advisory ([SECURITY] [DLA 2056-1] waitress security update)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'waitress' package(s) announced via the DSA-2056-1 advisory.
Insight
Insight
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 Software
Affected Software
'waitress' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
For Debian 8 'Jessie', this issue has been fixed in waitress version 0.8.9-2+deb8u1. We recommend that you upgrade your waitress packages.