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CVE-2024-52815— Synapse allows a a malformed invite to break the invitee's `/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，该漏洞源于无法正确验证通过联合收到的邀请。

AI Predicted 5.3 Difficulty: Easy EPSS 0.54% · P43
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I. Basic Information for CVE-2024-52815

Vulnerability Information
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Vulnerability Title
Synapse allows a a malformed invite to break the invitee's `/sync`
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver. Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user's /sync functionality. Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
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，该漏洞源于无法正确验证通过联合收到的邀请。
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 < 1.120.1 -

II. Public POCs for CVE-2024-52815

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III. Intelligence Information for CVE-2024-52815

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Vendor Advisories for CVE-2024-52815 (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-2024-53867 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-2024-52805 Synapse allows unsupported content types to lead to memory exhaustion

IV. Related Vulnerabilities

Same product: synapse
Same vendor: element-hq
Same weakness: CWE-20

V. Comments for CVE-2024-52815

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