CVE-2019-12855: Improper Certificate Validation in Twisted

CVE-2019-12855 · Severity: low · CVSS 3 · Published 2019-06-16

In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.

Technologies: twisted (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2019-12855 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-12855 being exploited in the wild.
How severe is CVE-2019-12855?
Low severity, with a CVSS score of 3, published 16 June 2019.
Which products and versions are affected?
twisted (PyPI) ECOSYSTEM:introduced=0,fixed=19.7.0rc1.
Is there a fix for CVE-2019-12855?
Yes. twisted (PyPI): upgrade to 19.7.0rc1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-12855?
Check whether you run twisted (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

  • twisted (PyPI): upgrade to 19.7.0rc1 or later
    pip install "twisted>=19.7.0rc1"

Affected products

  • twisted (PyPI) ECOSYSTEM:introduced=0,fixed=19.7.0rc1

Identifiers

  • CVE-2019-12855
  • GHSA-65rm-h285-5cc5
  • PYSEC-2019-129

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