CVE-2022-41952— synapse 资源管理错误漏洞

Uncontrolled Resource Consumption in Matrix Synapse

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L

未加控制的资源消耗(资源穷尽)

synapse 资源管理错误漏洞

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。

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