Bug 773214

Summary:	gnome-extra/synapse: improper key validity calculation (CVE-2021-21273)
Product:	Gentoo Security	Reporter:	John Helmert III <ajak>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	RESOLVED INVALID
Severity:	minor	CC:	desktop-misc
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://github.com/matrix-org/synapse/security/advisories/GHSA-v936-j8gp-9q3p
Whiteboard:	B4 [ebuild]
Package list:		Runtime testing required:	---

Description John Helmert III archtester

2021-02-27 02:03:21 UTC

CVE-2021-21273 (https://github.com/matrix-org/synapse/commit/30fba6210834a4ecd91badf0c8f3eb278b72e746):

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.


Fixed in 1.25.

Comment 1 John Helmert III archtester

2021-02-27 02:06:49 UTC

Actually, this isn't the right Synapse!