Description
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.
Metrics
CVSS 3.1 7.8/10
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
References
- https://github.com/jtesta/gog_galaxy_client_service_pocExploit, Third Party Advisory
- https://github.com/jtesta/gog_galaxy_client_service_poc/issues/1#issuecomment-926932218Issue Tracking, Third Party Advisory
- https://www.gog.com/galaxyVendor Advisory
- https://www.positronsecurity.com/blog/2020-08-13-gog-galaxy_client-local-privilege-escalation_deuce/Exploit, Third Party Advisory
- https://github.com/jtesta/gog_galaxy_client_service_pocExploit, Third Party Advisory
- https://github.com/jtesta/gog_galaxy_client_service_poc/issues/1#issuecomment-926932218Issue Tracking, Third Party Advisory
- https://www.gog.com/galaxyVendor Advisory
- https://www.positronsecurity.com/blog/2020-08-13-gog-galaxy_client-local-privilege-escalation_deuce/Exploit, Third Party Advisory
Timeline
- Published
- Aug 21, 2020
- Last modified
- Jun 17, 2026
- NVD status
- Modified