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CVE-2022-39374— Synapse Denial of service due to incorrect application of event authorization rules during state resolution

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 存在安全漏洞，该漏洞源于如果 Synapse 和恶意家庭服务器都加入了同一个房间，则恶意家庭服务器可以诱使 Synapse 接受先前拒绝的事件，并将其纳入该房间的当前状态视图。

AI Predicted 5.3 Difficulty: Easy EPSS 0.94% · P60

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-39374

Vulnerability Information
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Vulnerability Title
Synapse Denial of service due to incorrect application of event authorization rules during state resolution
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix 资源管理错误漏洞
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 存在安全漏洞，该漏洞源于如果 Synapse 和恶意家庭服务器都加入了同一个房间，则恶意家庭服务器可以诱使 Synapse 接受先前拒绝的事件，并将其纳入该房间的当前状态视图。
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, < 1.68.0 -

II. Public POCs for CVE-2022-39374

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III. Intelligence Information for CVE-2022-39374

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Patches & Fixes for CVE-2022-39374 (1)

Vendor Advisories for CVE-2022-39374 (1)

Same Patch Batch · matrix-org · 2023-05-26 · 3 CVEs total

CVE-2023-32323 5.0 MEDIUM Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites
CVE-2022-39335 5.0 MEDIUM Synapse does not apply enough checks to servers requesting auth events of events in a room

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-400

V. Comments for CVE-2022-39374

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