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CVE-2022-31052— URL previews can crash Synapse media repositories or Synapse monoliths

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.

Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.61.1 之前版本存在安全漏洞，该漏洞源于无限递归，某些网页的 URL 预览可能会耗尽 Synapse 进程的可用堆栈空间。

CVSS 6.5 · Medium EPSS 1.61% · P74

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2022-31052

Vulnerability Information
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Vulnerability Title
URL previews can crash Synapse media repositories or Synapse monoliths
Source: CVE Program / CVE List V5
Vulnerability Description
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.
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
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.61.1 之前版本存在安全漏洞，该漏洞源于无限递归，某些网页的 URL 预览可能会耗尽 Synapse 进程的可用堆栈空间。
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 < 1.61.1 -

II. Public POCs for CVE-2022-31052

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III. Intelligence Information for CVE-2022-31052

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Patches & Fixes for CVE-2022-31052 (1)

Vendor Advisories for CVE-2022-31052 (1)

Mailing List Discussions for CVE-2022-31052 (2)

Other References for CVE-2022-31052 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-674

V. Comments for CVE-2022-31052

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