HTTP Request Smuggling Affecting waitress package, versions *


Severity

Recommended
low

Based on Ubuntu security rating.

Threat Intelligence

Exploit Maturity
Not Defined
EPSS
0.34% (72nd percentile)

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  • Snyk IDSNYK-UBUNTU1604-WAITRESS-541190
  • published24 Dec 2019
  • disclosed20 Dec 2019

Introduced: 20 Dec 2019

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

How to fix?

There is no fixed version for Ubuntu:16.04 waitress.

NVD Description

Note: Versions mentioned in the description apply only to the upstream waitress package and not the waitress package as distributed by Ubuntu. See How to fix? for Ubuntu:16.04 relevant fixed versions and status.

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.

CVSS Scores

version 3.1