WinPcap NPF.SYS Privilege Elevation Vulnerability

    WinPcap NPF.SYS Privilege Elevation Vulnerability PoC exploit
    -------------------------------------------------------------

    Affected software: 

    (*) WinPcap versions affected (Confirmed)
    
    - WinPcap 3.1
    - WinPcap 4.1

(*) Operating systems affected (Confirmed)
    
    - Windows 2000 SP4 (Both server and workstation) 
    - Windows XP   SP2
    - Windows 2003 Server
    - Windows Vista !!

    Description:

    It's a well known issue that WinPcap security model allows non-administrator 
    users to use its device driver. If they don't manually unload it after using 
    tools such as Wireshark (ethereal), which unfortunatelly oftenly happens, this 
    can lead to unwanted network traffic sniffing and now with the help of this 
    exploit to kernel mode code execution ;-)       
    
    Remarks:
    
    The exploit code is a PoC and was tested only against Windows XP SP2, with minor 
    modifications (delta offsets and changing VirtualAlloc for NtAllocVirtualMemory due
    to base address restrictions in Windows Vista ) should work on all OSes commented 
    above.

    To test the PoC, just pick any software which uses WinPcap like WireShark, then 
    start to sniff in any iface and close it  (so WinPcap device gets up ). Run the 
    exploit code (as guest user if you want) you should hit an int 3 in kernel mode :-)
                    
    Vulnerability discovered by:
    
    Mario Ballano Bбrcena,  mballano[_at_]gmail.com 

You can download exploit and analysis at : http://www.48bits.com/exploits/npfxpl.c

Best regards,

Mario