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CVE-2023-45129— matrix-synapse vulnerable to denial of service due to malicious server ACL events

Quick assessment

Affected
matrix-org synapse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.94.0之前版本存在安全漏洞，该漏洞源于恶意服务器ACL事件会影响服务器性能并导致拒绝服务（DOS）。

CVSS 4.9 · Medium EPSS 1.39% · P72

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2023-45129

Vulnerability Information
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Vulnerability Title
matrix-synapse vulnerable to denial of service due to malicious server ACL events
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Prior to version 1.94.0, 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. Server administrators are advised to upgrade to Synapse 1.94.0 or later. As a workaround, rooms with malicious server ACL events can be purged and blocked using the admin API.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.94.0之前版本存在安全漏洞，该漏洞源于恶意服务器ACL事件会影响服务器性能并导致拒绝服务（DOS）。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org synapse < 1.94.0 -

II. Public POCs for CVE-2023-45129

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III. Intelligence Information for CVE-2023-45129

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Patches & Fixes for CVE-2023-45129 (1)

Vendor Advisories for CVE-2023-45129 (2)

Mailing List Discussions for CVE-2023-45129 (3)

Security Blog Posts for CVE-2023-45129 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-770

V. Comments for CVE-2023-45129

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