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CVE-2024-31208— Synapse's V2 state resolution weakness allows DoS from remote room members

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.

synapse是一个应用程序。用于开放式联合即时消息和VoIP。 Synapse 1.105.1之前版本存在安全漏洞，该漏洞源于身份验证链索引存在安全问题，允许攻击者通过磁盘填充和高使用 CPU 进行拒绝服务。

CVSS 6.5 · Medium EPSS 1.46% · P73

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-31208

Vulnerability Information
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Vulnerability Title
Synapse's V2 state resolution weakness allows DoS from remote room members
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is an open-source Matrix homeserver. A remote Matrix user with malicious intent, sharing a room with Synapse instances before 1.105.1, can dispatch specially crafted events to exploit a weakness in the V2 state resolution algorithm. This can induce high CPU consumption and accumulate excessive data in the database of such instances, resulting in a denial of service. Servers in private federations, or those that do not federate, are not affected. Server administrators should upgrade to 1.105.1 or later. Some workarounds are available. One can ban the malicious users or ACL block servers from the rooms and/or leave the room and purge the room using the admin API.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
synapse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
synapse是一个应用程序。用于开放式联合即时消息和VoIP。 Synapse 1.105.1之前版本存在安全漏洞，该漏洞源于身份验证链索引存在安全问题，允许攻击者通过磁盘填充和高使用 CPU 进行拒绝服务。
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 < 1.105.1 -

II. Public POCs for CVE-2024-31208

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III. Intelligence Information for CVE-2024-31208

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Patches & Fixes for CVE-2024-31208 (1)

Mailing List Discussions for CVE-2024-31208 (2)

Other References for CVE-2024-31208 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: element-hq
Same weakness: CWE-770

V. Comments for CVE-2024-31208

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