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CVE-2022-41952— Uncontrolled Resource Consumption in Matrix Synapse

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.

synapse是一个应用程序。用于开放式联合即时消息和VoIP synapse 1.52.0 之前版本存在资源管理错误漏洞，该漏洞源于在启用 URL 预览功能的 Synapse 将尝试为媒体流 URL 生成 URL 预览，而不会正确限制连接时间。只有在下载了“max_spider_size”（默认值：10M）字节后，连接才会终止，这在某些情况下会导致与流媒体服务器（例如：Icecast）的长期连接。

CVSS 6.5 · Medium EPSS 0.91% · P59

Possible ATT&CK Techniques 1 AI

T1498.002 · Reflection Amplification
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I. Basic Information for CVE-2022-41952

Vulnerability Information
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Vulnerability Title
Uncontrolled Resource Consumption in Matrix Synapse
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse before 1.52.0 with URL preview functionality enabled will attempt to generate URL previews for media stream URLs without properly limiting connection time. Connections will only be terminated after `max_spider_size` (default: 10M) bytes have been downloaded, which can in some cases lead to long-lived connections towards the streaming media server (for instance, Icecast). This can cause excessive traffic and connections toward such servers if their stream URL is, for example, posted to a large room with many Synapse instances with URL preview enabled. Version 1.52.0 implements a timeout mechanism which will terminate URL preview connections after 30 seconds. Since generating URL previews for media streams is not supported and always fails, 1.53.0 additionally implements an allow list for content types for which Synapse will even attempt to generate a URL preview. Upgrade to 1.53.0 to fully resolve the issue. As a workaround, turn off URL preview functionality by setting `url_preview_enabled: false` in the Synapse configuration file.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
synapse 资源管理错误漏洞
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 1.52.0 之前版本存在资源管理错误漏洞，该漏洞源于在启用 URL 预览功能的 Synapse 将尝试为媒体流 URL 生成 URL 预览，而不会正确限制连接时间。只有在下载了“max_spider_size”（默认值：10M）字节后，连接才会终止，这在某些情况下会导致与流媒体服务器（例如：Icecast）的长期连接。
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 < 1.53.0 -

II. Public POCs for CVE-2022-41952

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III. Intelligence Information for CVE-2022-41952

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Patches & Fixes for CVE-2022-41952 (1)

Vendor Advisories for CVE-2022-41952 (1)

Other References for CVE-2022-41952 (2)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-400

V. Comments for CVE-2022-41952

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