Improper Input Validation Affecting matrix-synapse package, versions <0.28.1+dfsg-1


Severity

Recommended
medium

Based on Ubuntu security rating

    Threat Intelligence

    EPSS
    0.1% (42nd percentile)

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  • Snyk ID SNYK-UBUNTU2004-MATRIXSYNAPSE-1195050
  • published 6 Apr 2021
  • disclosed 2 May 2018

How to fix?

Upgrade Ubuntu:20.04 matrix-synapse to version 0.28.1+dfsg-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream matrix-synapse package and not the matrix-synapse package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 2^63 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.