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  5. CVE-2019-18835

CVE-2019-18835: Improper Verification of Cryptographic Signature in matrix-synapse

May 24, 2022 (updated September 24, 2024)

Matrix Synapse before 1.5.0 mishandles signature checking on some federation APIs. Events sent over /send_join, /send_leave, and /invite may not be correctly signed, or may not come from the expected servers.

References

  • github.com/advisories/GHSA-cppw-2mf8-qpm5
  • github.com/matrix-org/synapse
  • github.com/matrix-org/synapse/commit/172f264ed38e8bef857552f93114b4ee113a880b
  • github.com/matrix-org/synapse/pull/6262
  • github.com/matrix-org/synapse/releases/tag/v1.5.0
  • github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2019-186.yaml
  • nvd.nist.gov/vuln/detail/CVE-2019-18835

Code Behaviors & Features

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Affected versions

All versions before 1.5.0

Fixed versions

  • 1.5.0

Solution

Upgrade to version 1.5.0 or above.

Impact 9.8 CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Learn more about CVSS

Weakness

  • CWE-347: Improper Verification of Cryptographic Signature

Source file

pypi/matrix-synapse/CVE-2019-18835.yml

Spotted a mistake? Edit the file on GitLab.

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