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CVE-2022-39335— Synapse does not apply enough checks to servers requesting auth events of events in a room

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，该漏洞源于回答授权事件查询的 Synapse 主服务器没有充分检查请求服务器是否应该能够访问它们。

CVSS 5.0 · Medium EPSS 0.64% · P48

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2022-39335

Vulnerability Information
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Vulnerability Title
Synapse does not apply enough checks to servers requesting auth events of events in a room
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 Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 信息泄露漏洞
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，该漏洞源于回答授权事件查询的 Synapse 主服务器没有充分检查请求服务器是否应该能够访问它们。
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 < 1.69.0 -

II. Public POCs for CVE-2022-39335

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III. Intelligence Information for CVE-2022-39335

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Patches & Fixes for CVE-2022-39335 (1)

Vendor Advisories for CVE-2022-39335 (1)

Mailing List Discussions for CVE-2022-39335 (1)

Other References for CVE-2022-39335 (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-2022-39374 Synapse Denial of service due to incorrect application of event authorization rules during

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-200

V. Comments for CVE-2022-39335

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