CVE-2019-16786

 

Published at: - 21-12-2019 12:15

Last modified: - 23-09-2022 08:58

Total changes: - 4

Description

Waitress through version 1.3.1 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. According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: "Transfer-Encoding: gzip, chunked" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

 

Verification logic

 

Reference

• https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63p
• https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3
• https://docs.pylonsproject.org/projects/waitress/en/latest/#security-fixes
• FEDORA-2020-bdcc8ffc24-Mailing List, Third Party Advisory
• FEDORA-2020-65a7744e38-Mailing List, Third Party Advisory
• RHSA-2020:0720-Third Party Advisory
• https://www.oracle.com/security-alerts/cpuapr2022.html
• [debian-lts-announce] 20220512 [SECURITY] [DLA 3000-1] waitress security update-Mailing List, Third Party Advisory

 

Keywords

NVD

 

CVE-2019-16786

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures