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CVE-2023-32683— URL deny list bypass via oEmbed and image URLs when generating previews in 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.

Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Matrix Synapse 1.85.0之前版本存在代码问题漏洞，该漏洞源于通过oEmbed 或URL 可以绕过 url_preview_url_blacklist 设置。

CVSS 3.5 · Low EPSS 0.60% · P48

Possible ATT&CK Techniques 1 AI

T1113 · Screen Capture
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I. Basic Information for CVE-2023-32683

Vulnerability Information
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Vulnerability Title
URL deny list bypass via oEmbed and image URLs when generating previews in Synapse
Source: CVE Program / CVE List V5
Vulnerability Description
Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the `url_preview_url_blacklist` setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the `url_preview_ip_range_blacklist` setting (by default this only allows public IPs) and by the limited information returned to the client: 1. For discovered oEmbed URLs, any non-JSON response or a JSON response which includes non-oEmbed information is discarded. 2. For discovered image URLs, any non-image response is discarded. Systems which have URL preview disabled (via the `url_preview_enabled` setting) or have not configured a `url_preview_url_blacklist` are not affected. This issue has been addressed in version 1.85.0. Users are advised to upgrade. User unable to upgrade may also disable URL previews.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Matrix Synapse 代码问题漏洞
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 1.85.0之前版本存在代码问题漏洞，该漏洞源于通过oEmbed 或URL 可以绕过 url_preview_url_blacklist 设置。
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 < 1.85.0 -

II. Public POCs for CVE-2023-32683

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III. Intelligence Information for CVE-2023-32683

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Patches & Fixes for CVE-2023-32683 (1)

Vendor Advisories for CVE-2023-32683 (1)

Mailing List Discussions for CVE-2023-32683 (1)

IV. Related Vulnerabilities

Same product: synapse
Same vendor: matrix-org
Same weakness: CWE-863

V. Comments for CVE-2023-32683

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