CVE-2022-41952

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 v3.0 5.3 MEDIUM

5.3^/10

CVSS v3.0 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47h	Mitigation Third Party Advisory
https://github.com/matrix-org/synapse/pull/11936	Patch Third Party Advisory
https://github.com/matrix-org/synapse/releases/tag/v1.53.0	Release Notes Third Party Advisory
https://github.com/matrix-org/synapse/releases/tag/v1.52.0	Release Notes Third Party Advisory
https://github.com/matrix-org/synapse/pull/11784	Patch Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*

Information

Published : 2022-11-22 08:15

Updated : 2022-11-25 19:29

NVD link : CVE-2022-41952

Mitre link : CVE-2022-41952

JSON object : View

CWE

CWE-400

Uncontrolled Resource Consumption

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Products Affected

matrix

synapse

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