CVE-2019-16785

NameCVE-2019-16785
DescriptionWaitress 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs947306

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
waitress (PTS)stretch1.0.1-1vulnerable
buster1.2.0~b2-2vulnerable
bullseye, sid1.4.1-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
waitresssource(unstable)1.4.1-1947306

Notes

[buster] - waitress <no-dsa> (Minor issue)
[stretch] - waitress <no-dsa> (Minor issue)
[jessie] - waitress <no-dsa> (Minor issue)
https://github.com/Pylons/waitress/security/advisories/GHSA-pg36-wpm5-g57p
https://github.com/Pylons/waitress/commit/8eba394ad75deaf9e5cd15b78a3d16b12e6b0eba

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