CVE-2021-29433: Sydent DoS (via resource exhaustion) due to improper input validation

CVE-2021-29433 · Severity: low · CVSS 3.1 · Published 2021-04-15

### Impact Missing input validation of some parameters on the endpoints used to confirm third-party identifiers could cause excessive use of disk space and memory leading to resource exhaustion. ### Patches Fixed by 3175fd3. ### Workarounds There are no known workarounds. ### References n/a ### For more information If you have any questions or comments about this advisory, email us at security@matrix.org.

Technologies: matrix-sydent (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2021-29433 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2021-29433 being exploited in the wild.
How severe is CVE-2021-29433?
Low severity, with a CVSS score of 3.1, published 15 April 2021.
Which products and versions are affected?
matrix-sydent (PyPI) ECOSYSTEM:introduced=0,fixed=2.3.0.
Is there a fix for CVE-2021-29433?
Yes. matrix-sydent (PyPI): upgrade to 2.3.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2021-29433?
Check whether you run matrix-sydent (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

  • matrix-sydent (PyPI): upgrade to 2.3.0 or later
    pip install "matrix-sydent>=2.3.0"

Affected products

  • matrix-sydent (PyPI) ECOSYSTEM:introduced=0,fixed=2.3.0

Identifiers

  • CVE-2021-29433
  • GHSA-pw4v-gr34-2553
  • PYSEC-2021-24

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