Homepage

HTTP Request Smuggling The advisory has been revoked - it doesn't affect any version of package waitress  (opens in a new tab)

Threat Intelligence

EPSS
2.38% (83rd percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-UBUNTU1604-WAITRESS-541190
  • published24 Dec 2019
  • disclosed20 Dec 2019
Report a new vulnerability Found a mistake?

Introduced: 20 Dec 2019

CVE-2019-16786  (opens in a new tab)
CWE-444  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:16.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream waitress package and not the waitress package as distributed by Ubuntu.

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.

References