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CVE-2022-41952

6.5 · MEDIUM

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.

Published Nov 22, 2022CWE-400EPSS 0.91%

Overview

CVE-2022-41952 is a medium-severity vulnerability. It was published on November 22, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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_pre

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/matrix-org/synapse/pull/11784GitHubgithub.com/matrix-org/synapse/pull/11936GitHubgithub.com/matrix-org/synapse/releases/tag/v1.52.0GitHubgithub.com/matrix-org/synapse/releases/tag/v1.53.0GitHubgithub.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47hGitHubgithub.com/matrix-org/synapse/pull/11784GitHubgithub.com/matrix-org/synapse/pull/11936GitHubgithub.com/matrix-org/synapse/releases/tag/v1.52.0GitHubgithub.com/matrix-org/synapse/releases/tag/v1.53.0GitHubgithub.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47h

How CyberStrike helps

Frequently asked questions

What is CVE-2022-41952?

CVE-2022-41952 is a medium-severity vulnerability. It was published on November 22, 2022 and has a CVSS 3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2022-41952?

This vulnerability has a CVSS 3.1 base score of 6.5, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2022-41952?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-41952?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-41952 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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