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

Information

Severity

Severity

Medium

Family

Family

Debian Local Security Checks

CVSSv2 Base

CVSSv2 Base

5.0

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

2 years ago

Modified

Modified

2 years ago

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.