Missing XPC Client & NSXPC endpoint validation leads to privilege escalation in Vienna Assistant (MacOS) - Vienna Symphonic Library

The VSL privileged helper does utilize NSXPC for IPC. The implementation of the "shouldAcceptNewConnection" function, which is used by the NSXPC framework to validate if a client should be allowed to connect to the XPC listener, does not validate clients at all. This means that any process can connect to this service using the configured protocol. A malicious process is able to call all the functions defined in the corresponding HelperToolProtocol. No validation is performed in the functions "writeReceiptFile" and “runUninstaller” of the HelperToolProtocol. This allows an attacker to write files to any location with any data as well as execute any file with any arguments. Any process can call these functions because of the missing XPC client validation described before. The abuse of the missing endpoint validation leads to privilege escalation.

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关键功能的认证机制缺失

Vienna Symphonic Library Vienna Assistant 安全漏洞

Vienna Symphonic Library Vienna Assistant是Vienna Symphonic Library公司的一款音乐采样库下载与管理工具。 Vienna Symphonic Library Vienna Assistant存在安全漏洞，该漏洞源于缺少客户端验证和端点验证，可能导致任意文件写入、任意文件执行和权限提升。

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