CVE-2019-16785 — HTTP Request Smuggling in Waitress
Severity
7.5HIGHNVD
CNA7.1
EPSS
1.0%
top 22.71%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedDec 20
Latest updateJan 15
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…
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NExploitability: 3.9 | Impact: 3.6
Affected Packages4 packages
Also affects: Debian Linux 9.0, Fedora 30, 31
Patches
🔴Vulnerability Details
4📋Vendor Advisories
2💬Community
4Bugzilla▶
CVE-2019-16785 python-waitress: waitress: HTTP request smuggling through LF vs CRLF handling [fedora-all]↗2020-01-15
Bugzilla▶
CVE-2019-16785 python-waitress: waitress: HTTP request smuggling through LF vs CRLF handling [epel-all]↗2020-01-15
Bugzilla▶
CVE-2019-16785 python-waitress: waitress: HTTP request smuggling through LF vs CRLF handling [openstack-rdo]↗2020-01-15