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CVE-2024-37303— Synapse unauthenticated writes to the media repository allow planting of problematic content

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 1.106之前版本存在安全漏洞，该漏洞源于允许未认证的远程参与者触发远程媒体下载并缓存到本地媒体库，从而使问题内容可被未认证下载。

CVSS 5.3 · Medium EPSS 0.43% · P35
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I. Basic Information for CVE-2024-37303

Vulnerability Information
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Vulnerability Title
Synapse unauthenticated writes to the media repository allow planting of problematic content
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such content then also becomes available for download from the local homeserver in an unauthenticated way. The implication is that unauthenticated remote adversaries can use this functionality to plant problematic content into the media repository. Synapse 1.106 introduces a partial mitigation in the form of new endpoints which require authentication for media downloads. The unauthenticated endpoints will be frozen in a future release, closing the attack vector.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
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 1.106之前版本存在安全漏洞，该漏洞源于允许未认证的远程参与者触发远程媒体下载并缓存到本地媒体库，从而使问题内容可被未认证下载。
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 < 1.106 -

II. Public POCs for CVE-2024-37303

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III. Intelligence Information for CVE-2024-37303

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Patches & Fixes for CVE-2024-37303 (1)

Vendor Advisories for CVE-2024-37303 (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-2024-53867 4.3 MEDIUM Synapse Matrix has a partial room state leak via Sliding Sync
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-306

V. Comments for CVE-2024-37303

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