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CVE-2022-31152— Synapse vulnerable to denial of service (DoS) due to incorrect application of event authorization rules

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 1.61.0 及之前版本存在安全漏洞，该漏洞源于在确定是否应将事件接受到房间时，其中一些规则未正确应用。 攻击者可以制作Synapse可以接受但不符合规范的服务器的事件，这可能会导致服务器之间的房间状态出现差异。

CVSS 6.4 · Medium EPSS 1.18% · P67

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-31152

Vulnerability Information
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Vulnerability Title
Synapse vulnerable to denial of service (DoS) due to incorrect application of event authorization rules
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix specification specifies a list of [event authorization rules](https://spec.matrix.org/v1.2/rooms/v9/#authorization-rules) which must be checked when determining if an event should be accepted into a room. In versions of Synapse up to and including version 1.61.0, some of these rules are not correctly applied. An attacker could craft events which would be accepted by Synapse but not a spec-conformant server, potentially causing divergence in the room state between servers. Administrators of homeservers with federation enabled are advised to upgrade to version 1.62.0 or higher. Federation can be disabled by setting [`federation_domain_whitelist`](https://matrix-org.github.io/synapse/latest/usage/configuration/config_documentation.html#federation_domain_whitelist) to an empty list (`[]`) as a workaround.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对异常条件检查或处理不恰当
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 1.61.0 及之前版本存在安全漏洞，该漏洞源于在确定是否应将事件接受到房间时，其中一些规则未正确应用。 攻击者可以制作Synapse可以接受但不符合规范的服务器的事件，这可能会导致服务器之间的房间状态出现差异。
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 < 1.62.0 -

II. Public POCs for CVE-2022-31152

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III. Intelligence Information for CVE-2022-31152

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Patches & Fixes for CVE-2022-31152 (2)

Vendor Advisories for CVE-2022-31152 (1)

Other References for CVE-2022-31152 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-703

V. Comments for CVE-2022-31152

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