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Hash: SHA512

Format: 1.8
Date: Wed, 11 May 2022 22:42:07 -0400
Source: waitress
Architecture: source
Version: 1.2.0~b2-2+deb10u1
Distribution: buster-security
Urgency: high
Maintainer: Andrej Shadura <andrewsh@debian.org>
Changed-By: Stefano Rivera <stefanor@debian.org>
Closes: 1008013
Changes:
waitress (1.2.0~b2-2+deb10u1) buster-security; urgency=high
.
* Non-maintainer upload by the Security Team.
* Security updates to fix request smuggling bugs, when combined with another
http proxy that interprets requests differently. This can lead to a
potential for HTTP request smuggling/splitting whereby Waitress may see
two requests while the front-end server only sees a single HTTP message.
This can result in cache poisoning or unexpected information disclosure.
The specific issues resolved are:
- CVE-2019-16785: Only recognise CRLF as a line-terminator, not a plain
LF. Before this change waitress could see two requests where the
front-end proxy only saw one.
- CVE-2019-16786: Waitress would parse the Transfer-Encoding header and
only look for a single string value, if that value was not "chunked" it
would fall through and use the Content-Length header instead.
This could allow for Waitress to treat a single request as multiple
requests in the case of HTTP pipelining.
- CVE-2019-16789: 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 unexpected information disclosure.
- CVE-2019-16792: If two Content-Length headers are sent in a single
request, Waitress would treat the request as having no body, thereby
treating the body of the request as a new request in HTTP pipelining.
- CVE-2022-24761: There are two classes of vulnerability that may lead to
request smuggling that are addressed by this advisory:
+ The use of Python's int() to parse strings into integers, leading to
+10 to be parsed as 10, or 0x01 to be parsed as 1, where as the
standard specifies that the string should contain only digits or hex
digits.
+ Waitress does not support chunk extensions, however it was discarding
them without validating that they did not contain illegal characters.
(Closes: #1008013)
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