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AUSCERT External Security Bulletin Redistribution
waitress security update
2 January 2020
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 8
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Unauthorised Access -- Remote/Unauthenticated
Reduced Security -- Remote/Unauthenticated
CVE Names: CVE-2019-16789
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Package : waitress
Version : 0.8.9-2+deb8u1
Debian Bug : #765126
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
For Debian 8 "Jessie", this issue has been fixed in waitress version
We recommend that you upgrade your waitress packages.
Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS
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: :' : Chris Lamb
`. `'` firstname.lastname@example.org / chris-lamb.co.uk
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