The client (aka GalaxyClientService.exe) in GOG GALAXY through 2.0.41 (as of 12:58 AM Eastern, 9/26/21) allows local privilege escalation from any authenticated user to SYSTEM by instructing the Windows service to execute arbitrary commands. This occurs because the attacker can inject a DLL into GalaxyClient.exe, defeating the TCP-based "trusted client" protection mechanism.
The product contains hard-coded credentials, such as a password or cryptographic key.
| Link | Tags |
|---|---|
| https://www.gog.com/galaxy | vendor advisory |
| https://www.positronsecurity.com/blog/2020-08-13-gog-galaxy_client-local-privilege-escalation_deuce/ | third party advisory exploit |
| https://github.com/jtesta/gog_galaxy_client_service_poc | third party advisory exploit |
| https://github.com/jtesta/gog_galaxy_client_service_poc/issues/1#issuecomment-926932218 | issue tracking third party advisory |