CVE-2022-31052
URL previews of unusual or maliciously-crafted pages can crash Synapse media repositories or Synapse monoliths
描述
Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because the URL preview endpoint is authenticated. Deployments with `url_preview_enabled: false` set in configuration are not affected. Deployments with `url_preview_enabled: true` set in configuration **are** affected. Deployments with no configuration value set for `url_preview_enabled` are not affected, because the default is `false`. Administrators of homeservers with URL previews enabled are advised to upgrade to v1.61.1 or higher. Users unable to upgrade should set `url_preview_enabled` to false.
如何修補 CVE-2022-31052
要修補 CVE-2022-31052,請將受影響套件升級到下列已修補版本。
- —升級至 1.61.1-1 或更新版本
- —升級至 1.61.1 或更新版本
- —升級至 fa1308061802ac7b7d20e954ba7372c5ac292333 或更新版本
CVE-2022-31052 正在被利用嗎?
低 — EPSS 為 1.6%,目前沒有觀察到大規模利用活動。
受影響套件(3)
- from 0, < 1.61.1-1
- from 0, < 1.61.1