http://bugzilla.opensuse.org/show_bug.cgi?id=1205669 Bug ID: 1205669 Summary: VUL-0: CVE-2022-41952: matrix-synapse: URL preview functionality is not properly limiting connection time Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.4 Hardware: Other URL: https://smash.suse.de/issue/348715/ OS: Other Status: NEW Severity: Normal Priority: P5 - None Component: Security Assignee: okurz@suse.com Reporter: abergmann@suse.com QA Contact: security-team@suse.de Found By: Security Response Team Blocker: --- Only openSUSE:Backports and openSUSE:Factory: 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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-41952 https://www.cve.org/CVERecord?id=CVE-2022-41952 https://github.com/matrix-org/synapse/security/advisories/GHSA-4822-jvwx-w47... https://github.com/matrix-org/synapse/pull/11936 https://github.com/matrix-org/synapse/releases/tag/v1.53.0 https://github.com/matrix-org/synapse/releases/tag/v1.52.0 https://github.com/matrix-org/synapse/pull/11784 -- You are receiving this mail because: You are on the CC list for the bug.