Open redirects on some federation and push requests

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

指向未可信站点的URL重定向(开放重定向)

Matrix Synapse 输入验证错误漏洞

Matrix Synapse是英国Matrix基金会的一款矩阵管理服务器的实现。 Synapse 存在安全漏洞，该漏洞源于当计算第三方邀请事件的密钥有效性和发送推送通知时，对用户提供域的请求不受外部IP地址的限制。

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