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Matrix Synapse Improper Signature Validation

High severity GitHub Reviewed Published May 13, 2022 to the GitHub Advisory Database • Updated Oct 6, 2023

Package

pip matrix-synapse (pip)

Affected versions

>= 0.33.3, < 0.33.3.1
< 0.33.2.1

Patched versions

0.33.3.1
0.33.2.1

Description

Matrix Synapse before 0.33.3.1 and 0.33.2.1 allows remote attackers to spoof events and possibly have unspecified other impacts by leveraging improper transaction and event signature validation.

References

Published by the National Vulnerability Database Sep 18, 2018
Published to the GitHub Advisory Database May 13, 2022
Reviewed Jul 24, 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
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
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:L/UI:N/S:U/C:H/I:H/A:H

EPSS score

0.310%
(71st percentile)

Weaknesses

CVE ID

CVE-2018-16515

GHSA ID

GHSA-fmvh-rvq5-hhjx

Source code

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