CVE-2019-16792: Duplicate Advisory: Inconsistent Interpretation of HTTP Requests in Waitress

CVE-2019-16792 · Severity: low · CVSS 3.1 · Published 2020-01-22

Waitress through version 1.3.1 allows 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 1.4.0.

Technologies: waitress (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-16792 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-16792 being exploited in the wild.
How severe is CVE-2019-16792?
Low severity, with a CVSS score of 3.1, published 22 January 2020.
Which products and versions are affected?
waitress (PyPI) ECOSYSTEM:introduced=0,fixed=1.4.0, GIT:introduced=0,fixed=575994cd42e83fd772a5f7ec98b2c56751bd3f65|ECOSYSTEM:introduced=0,fixed=1.4.0.
Is there a fix for CVE-2019-16792?
Yes. waitress (PyPI): upgrade to 1.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-16792?
Check whether you run waitress (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • waitress (PyPI): upgrade to 1.4.0 or later
    pip install "waitress>=1.4.0"

Affected products

  • waitress (PyPI) ECOSYSTEM:introduced=0,fixed=1.4.0, GIT:introduced=0,fixed=575994cd42e83fd772a5f7ec98b2c56751bd3f65|ECOSYSTEM:introduced=0,fixed=1.4.0

Identifiers

  • CVE-2019-16792
  • GHSA-4ppp-gpcr-7qf6
  • GHSA-j7j6-7hfx-5522
  • PYSEC-2020-178

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