PYSEC-2020-197 - Waitress through version 1.3.1 allows request smuggling by sending the Content-Length header twice…

Severity: info · 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 This vulnerability exploited in the wild?
No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.
How severe is This vulnerability?
Informational severity, published 22 January 2020.
Which products and versions are affected?
waitress (PyPI) GIT:introduced=0,fixed=575994cd42e83fd772a5f7ec98b2c56751bd3f65|ECOSYSTEM:introduced=0,fixed=1.4.0.
Is there a fix for This vulnerability?
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?
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) GIT:introduced=0,fixed=575994cd42e83fd772a5f7ec98b2c56751bd3f65|ECOSYSTEM:introduced=0,fixed=1.4.0

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