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CVE-2023-32323— Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites

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Synapse 主服务器 X 上有权创建某些状态事件的恶意用户可以禁用从 X 到任意主服务器 Y 的出站联合。

CVSS 5.0 · Medium EPSS 0.98% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-32323

Vulnerability Information
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Vulnerability Title
Synapse Outgoing federation to specific hosts can be disabled by sending malicious invites
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. A malicious user on a Synapse homeserver X with permission to create certain state events can disable outbound federation from X to an arbitrary homeserver Y. Synapse instances with federation disabled are not affected. In versions of Synapse up to and including 1.73, Synapse did not limit the size of `invite_room_state`, meaning that it was possible to create an arbitrarily large invite event. Synapse 1.74 refuses to create oversized `invite_room_state` fields. Server operators should upgrade to Synapse 1.74 or newer urgently.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 输入验证错误漏洞
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Synapse 主服务器 X 上有权创建某些状态事件的恶意用户可以禁用从 X 到任意主服务器 Y 的出站联合。
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 < 1.74.0 -

II. Public POCs for CVE-2023-32323

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III. Intelligence Information for CVE-2023-32323

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Patches & Fixes for CVE-2023-32323 (1)

Vendor Advisories for CVE-2023-32323 (1)

Other References for CVE-2023-32323 (1)

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

CVE-2022-39335 5.0 MEDIUM Synapse does not apply enough checks to servers requesting auth events of events in a room
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-20

V. Comments for CVE-2023-32323

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