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HTTP Request Smuggling Affecting waitress package, versions [,1.4.0)

0.0
high

Snyk CVSS

    Attack Complexity High
    Scope Changed
    Confidentiality High

    Threat Intelligence

    EPSS 0.27% (68th percentile)
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NVD
7.5 high
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SUSE
5.9 medium

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  • Snyk ID SNYK-PYTHON-WAITRESS-543054
  • published 22 Jan 2020
  • disclosed 22 Jan 2020
  • credit Unknown
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Introduced: 22 Jan 2020

CVE-2019-16792 Open this link in a new tab
CWE-444 Open this link in a new tab

How to fix?

Upgrade waitress to version 1.4.0 or higher.

Overview

waitress is a production-quality pure-Python WSGI server with very acceptable performance.

Affected versions of this package are vulnerable to HTTP Request Smuggling. It is possible to conduct request smuggling by sending the Content-Length header twice. Waitress would header fold a double Content-Length header and due to being unable to cast the now comma separated value to an integer would set the Content-Length to 0 internally. If two Content-Length headers are sent in a single request, Waitress would treat the request as having no body, thereby treating the body of the request as a new request in HTTP pipelining. This issue is fixed in Waitress