Skip to content

Matrix Synapse DoS

High severity GitHub Reviewed Published May 14, 2022 to the GitHub Advisory Database • Updated Oct 6, 2023

Package

pip matrix-synapse (pip)

Affected versions

< 0.28.1

Patched versions

0.28.1

Description

Matrix Synapse before 0.28.1 is prone to a denial of service flaw where malicious events injected with depth = 263 - 1 render rooms unusable, related to federation/federation_base.py and handlers/message.py, as exploited in the wild in April 2018.

References

Published by the National Vulnerability Database May 2, 2018
Published to the GitHub Advisory Database May 14, 2022
Reviewed Jul 25, 2023
Last updated Oct 6, 2023

Severity

High

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS score

0.118%
(46th percentile)

Weaknesses

CVE ID

CVE-2018-10657

GHSA ID

GHSA-vmcc-4p4x-x7wg

Source code

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.