Sandbox escape for instances that have enabled transformation functions in matrix-hookshot

matrix-hookshot is a Matrix bot for connecting to external services like GitHub, GitLab, JIRA, and more. Instances that have enabled transformation functions (those that have `generic.allowJsTransformationFunctions` in their config), may be vulnerable to an attack where it is possible to break out of the `vm2` sandbox and as a result Hookshot will be vulnerable to this. This problem is only likely to affect users who have allowed untrusted users to apply their own transformation functions. If you have only enabled a limited set of trusted users, this threat is reduced (though not eliminated). Version 4.5.0 and above of hookshot include a new sandbox library which should better protect users. Users are advised to upgrade. Users unable to upgrade should disable `generic.allowJsTransformationFunctions` in the config.

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

输出中的特殊元素转义处理不恰当(注入)

matrix-hookshot 注入漏洞

Matrix是一个雄心勃勃的新生态系统，用于开放联合即时消息和 VoIP。 matrix-hookshot 4.5.0 及之前版本存在注入漏洞，该漏洞源于启用了转换函数的实例可能受到突破vm2沙箱的攻击。

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