CVE-2022-41952
Uncontrolled Resource Consumption in Matrix Synapse
描述
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.
如何修補 CVE-2022-41952
要修補 CVE-2022-41952,請將受影響套件升級到下列已修補版本。
- —升級至 1.53.0 或更新版本
- —升級至 1.53.0 或更新版本
CVE-2022-41952 正在被利用嗎?
低 — EPSS 為 0.8%,目前沒有觀察到大規模利用活動。
受影響套件(2)
- from 0, < 1.53.0
- from 0, < 1.53.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | MEDIUM5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |