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CVE-2024-53867— Synapse Matrix has a partial room state leak via Sliding Sync

Quick assessment

Affected
element-hq 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.

Element Synapse是Element开源的一个开源 Matrix 家庭服务器实现。 Element Synapse存在安全漏洞，该漏洞源于Sliding Sync功能可能会将部分房间状态更改泄露给不再在房间中的用户。

CVSS 4.3 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2024-53867

Vulnerability Information
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Vulnerability Title
Synapse Matrix has a partial room state leak via Sliding Sync
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
将系统数据暴露到未授权控制的范围
Source: CVE Program / CVE List V5
Vulnerability Title
Element Synapse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Element Synapse是Element开源的一个开源 Matrix 家庭服务器实现。 Element Synapse存在安全漏洞，该漏洞源于Sliding Sync功能可能会将部分房间状态更改泄露给不再在房间中的用户。
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
element-hq synapse >= 1.113.0rc1, < 1.120.1 -

II. Public POCs for CVE-2024-53867

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III. Intelligence Information for CVE-2024-53867

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Patches & Fixes for CVE-2024-53867 (1)

Vendor Advisories for CVE-2024-53867 (1)

Same Patch Batch · element-hq · 2024-12-03 · 6 CVEs total

CVE-2024-37302 7.5 HIGH Synapse denial of service through media disk space consumption
CVE-2024-37303 5.3 MEDIUM Synapse unauthenticated writes to the media repository allow planting of problematic conte
CVE-2024-53863 Synapse can be forced to thumbnail unexpected file formats, invoking external, potentially
CVE-2024-52815 Synapse allows a a malformed invite to break the invitee's `/sync`
CVE-2024-52805 Synapse allows unsupported content types to lead to memory exhaustion

IV. Related Vulnerabilities

Same product: synapse
Same vendor: element-hq
Same weakness: CWE-497

V. Comments for CVE-2024-53867

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