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This repository has been archived by the owner on Apr 26, 2024. It is now read-only.

Denial of service due to malicious server ACL events

Moderate
reivilibre published GHSA-5chr-wjw5-3gq4 Oct 10, 2023

Package

pip matrix-synapse (pip)

Affected versions

< 1.94.0

Patched versions

1.94.0

Description

Impact

A malicious server ACL event can impact performance temporarily or permanently leading to a persistent denial of service.

Homeservers running on a closed federation (which presumably do not need to use server ACLs) are not affected.

Patches

Server administrators are advised to upgrade to Synapse 1.94.0 or later.

Workarounds

Rooms with malicious server ACL events can be purged and blocked using the admin API.

References

#16360

Severity

Moderate

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

CVE ID

CVE-2023-45129

Weaknesses

No CWEs