CVE-2022-41952

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Summary

CVECVE-2022-41952
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2022-11-22 16:15:00 UTC
Updated2023-07-06 13:37:00 UTC
DescriptionSynapse 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.

Risk And Classification

Problem Types: CWE-772

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Matrix Synapse All All All All

References

ReferenceSourceLinkTags
Generating URL previews of media streams causing long-lived connections · Advisory · matrix-org/synapse · GitHub CONFIRM github.com
Release v1.52.0 · matrix-org/synapse · GitHub MISC github.com
Release v1.53.0 · matrix-org/synapse · GitHub MISC github.com
Implement a content type allow list for URL previews by dkasak · Pull Request #11936 · matrix-org/synapse · GitHub MISC github.com
Apply a timeout to reading the body when fetching a file. by clokep · Pull Request #11784 · matrix-org/synapse · GitHub MISC github.com
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