The Unreal engine developed by EpicGames has a flaw with UMOD where it handles information from files without properly filtering for dangerous characters. Using a standard directory traversal attack, an attacker is able to go outside of the game’s directory to overwrite any file in the partition on which the game is installed.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/33165/unrealEngine2.txt
Source: https://packetstormsecurity.com/files/33165/unrealEngine2.txt.html