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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 2.09% (89th percentile)
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NVD
7.5 high
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SUSE
7.5 high
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Red Hat
7.1 high

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  • Snyk ID SNYK-PYTHON-WAITRESS-538573
  • published 22 Dec 2019
  • disclosed 13 Dec 2019
  • credit Unknown
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Introduced: 13 Dec 2019

CVE-2019-16785 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. 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 could lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message.