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Steam (Multiple .exe's) Local Privilage Escalation By: MrDoug mrdoug13[at]gmail[dot]com Version Info: Steam windows client Built: Jun 30 2009, at 13:29:32 Steam API: v008 Steam Package versions: 54/894 Greetz: Slappywag, Doomchip, Bolo, Eliwood, and the rest. Special Thanks: Jeremy Brown and Nine:Situations:Group... Their work led me to this. ================================================== The latest Steam client, (and other Steam related executables) suffer the same privilage escelation issue we saw in Adobe Acrobat NOS the other day (http://milw0rm.com/exploits/9199). This is particularly bad becuase, by default, Steam starts atomaticly. That means that as soon as an administrator logs in... game over. ================================================== POC: C:\>cacls "C:\Program Files\Steam\Steam.exe" C:\Program Files\Steam\Steam.exe BUILTIN\Users:F <-- (Danger Will Robinson!!) BUILTIN\Power Users:C BUILTIN\Administrators:F NT AUTHORITY\SYSTEM:F The executables listed below are also vulnerable, as well as many, MANY more that I have not mentioned. See for yourself. %programfiles%\Steam\uninstall_css.exe %programfiles%\Steam\Unwise32.exe %programfiles%\Steam\GameOverlayUI.exe %programfiles%\Steam\uninstall_steam.exe %programfiles%\Steam\WriteMiniDump.exe %programfiles%\Steam\bin\SteamService.exe --The following are dependant on what games are installed. %programfiles%\Steam\common\audiosurf\Audiosurf.exe %programfiles%\Steam\common\audiosurf\testapp.exe %programfiles%\Steam\common\audiosurf\engine\QuestViewer.exe %programfiles%\Steam\common\left 4 dead\left4dead.exe %programfiles%\Steam\steamapps\[username]\counter-strike source\hl2.exe %programfiles%\Steam\steamapps\[username]\half-life 2\hl2.exe %programfiles%\Steam\steamapps\[username]\garrysmod\hl2.exe ...etc...etc...etc... There are probably 100 more, just look around. I am yet to see an executable in the Steam directory with propor permissions. ================================================== Exploit: So simple... write it yourself you silly goose :3