http://bugzilla.opensuse.org/show_bug.cgi?id=1182897 Bug ID: 1182897 Summary: VUL-0: CVE-2021-21273: matrix-synapse: user provided domains were not restricted to external IP addresses Classification: openSUSE Product: openSUSE Distribution Version: Leap 15.2 Hardware: Other URL: https://smash.suse.de/issue/278709/ OS: Other Status: NEW Severity: Minor Priority: P5 - None Component: Basesystem Assignee: okurz@suse.com Reporter: abergmann@suse.com QA Contact: security-team@suse.de Found By: Security Response Team Blocker: --- CVE-2021-21273 Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.25.0, requests to user provided domains were not restricted to external IP addresses when calculating the key validity for third-party invite events and sending push notifications. This could cause Synapse to make requests to internal infrastructure. The type of request was not controlled by the user, although limited modification of request bodies was possible. For the most thorough protection server administrators should remove the deprecated `federation_ip_range_blacklist` from their settings after upgrading to Synapse v1.25.0 which will result in Synapse using the improved default IP address restrictions. See the new `ip_range_blacklist` and `ip_range_whitelist` settings if more specific control is necessary. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-21273 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21273 https://github.com/matrix-org/synapse/commit/30fba6210834a4ecd91badf0c8f3eb2... https://github.com/matrix-org/synapse/pull/8821 https://github.com/matrix-org/synapse/releases/tag/v1.25.0 https://github.com/matrix-org/synapse/security/advisories/GHSA-v936-j8gp-9q3... -- You are receiving this mail because: You are on the CC list for the bug.