matrix matrix-appservice-bridge 关键功能的认证机制缺失

CVE编号

CVE-2021-32659

利用情况

暂无

补丁情况

N/A

披露时间

2021-06-17

漏洞描述

Matrix-appservice-bridge is the bridging service for the Matrix communication program's application services. In versions 2.6.0 and earlier, if a bridge has room upgrade handling turned on in the configuration (the `roomUpgradeOpts` key when instantiating a new `Bridge` instance.), any `m.room.tombstone` event it encounters will be used to unbridge the current room and bridge into the target room. However, the target room `m.room.create` event is not checked to verify if the `predecessor` field contains the previous room. This means that any malicious admin of a bridged room can repoint the traffic to a different room without the new room being aware. Versions 2.6.1 and greater are patched. As a workaround, disabling the automatic room upgrade handling can be done by removing the `roomUpgradeOpts` key from the `Bridge` class options.

解决建议

建议您更新当前系统或软件至最新版，完成漏洞的修复。

参考链接
https://github.com/matrix-org/matrix-appservice-bridge/commit/b69e745584a34fc...
https://github.com/matrix-org/matrix-appservice-bridge/releases/tag/2.6.1
https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GH...

受影响软件情况

#	类型	厂商	产品	版本	影响面
1
	运行在以下环境
	应用	matrix	matrix-appservice-bridge	*		Up to (excluding) 2.6.1

CVSS3评分 4.9

• 攻击路径 网络
• 攻击复杂度 低
• 权限要求 高
• 影响范围 未更改
• 用户交互 无
• 可用性 无
• 保密性 无
• 完整性 高

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N CWE-ID 漏洞类型 CWE-306 关键功能的认证机制缺失