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**Name of the Vulnerable Software and Affected Versions** GOG Galaxy (Beta) versions 2.0.67.2 through 2.0.71.2 **Description** A Privilege Escalation issue in the inter-process communication procedure allows authenticated users to change the DACL of arbitrary system directories to include Everyone full control permissions by modifying the `FixDirectoryPrivileges` instruction parameters sent from `GalaxyClient.exe` to `GalaxyClientService.exe`. **Recommendations** For GOG Galaxy (Beta) versions 2.0.67.2 through 2.0.71.2, consider disabling the `FixDirectoryPrivileges` instruction until a patch is available to prevent exploitation. Restrict access to the `GalaxyClientService.exe` to minimize the risk of exploitation. Avoid using the `FixDirectoryPrivileges` parameter in the affected inter-process communication procedure until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

**Name of the Vulnerable Software and Affected Versions** GOG GALAXY versions through 2.0.41 **Description** The issue allows local privilege escalation from any authenticated user to SYSTEM by instructing the Windows service to execute arbitrary commands. This occurs because an attacker can inject a DLL into GalaxyClient.exe, defeating the TCP-based "trusted client" protection mechanism. **Recommendations** For versions through 2.0.41, update to a version later than 2.0.41 to resolve the issue. As a temporary workaround, consider restricting access to the GalaxyClientService.exe to minimize the risk of exploitation.

**Name of the Vulnerable Software and Affected Versions** GOG Galaxy versions 1.2.x through 1.2.64 GOG Galaxy versions 2.0.x through 2.0.12 **Description** The GalaxyClientService component of GOG Galaxy runs with elevated SYSTEM privileges in a Windows environment. Due to the software shipping with an embedded, static RSA private key, an attacker with this key material and local user permissions can send any operating system command to the service for execution in this elevated context. The service listens for such commands on a locally-bound network port, `localhost:9978`. **Recommendations** For GOG Galaxy versions 1.2.x through 1.2.64, at the moment, there is no information about a newer version that contains a fix for this vulnerability. For GOG Galaxy versions 2.0.x through 2.0.12, update to a version that includes the fix issued for the 2.0.x branch.