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SUSE: CVE-2019-16785: SUSE Linux Security Advisory

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SUSE: CVE-2019-16785: SUSE Linux Security Advisory

Severity
5
CVSS
(AV:N/AC:L/Au:N/C:N/I:P/A:N)
Published
12/20/2019
Created
11/13/2020
Added
11/11/2020
Modified
05/11/2021

Description

Waitress through version 1.3.1 implemented a "MAY" part of the RFC7230 which states: "Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR." Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. 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 issue is fixed in Waitress 1.4.0.

Solution(s)

  • suse-upgrade-python2-waitress
  • suse-upgrade-python3-waitress

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