CVE-2021-21392— Apache Synapse 输入验证错误漏洞

Open redirect via transitional IPv6 addresses on dual-stack networks

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 1.28.0 requests to user provided domains were not restricted to external IP addresses when transitional IPv6 addresses were used. Outbound requests to federation, identity servers, when calculating the key validity for third-party invite events, sending push notifications, and generating URL previews are affected. This could cause Synapse to make requests to internal infrastructure on dual-stack networks. See referenced GitHub security advisory for details and workarounds.

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

指向未可信站点的URL重定向(开放重定向)

Apache Synapse 输入验证错误漏洞

Apache Synapse是美国阿帕奇（Apache）基金会的一款轻量级ESB（企业服务总线）。 Synapse 1.28.0版本之前存在安全漏洞，该漏洞源于当Synapse使用过渡IPv6地址时，对用户提供的域的请求不限于外部IP地址。在计算第三方邀请事件的密钥有效性，发送推送通知以及生成URL预览时，对联合身份验证服务器的出站请求会受到影响。

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