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Created: Sunday, October 22 2006 03:22.16 CDT Modified: Sunday, October 22 2006 03:23.42 CDT

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Kartoffel and Vulnerable Device Drivers

Author: evilcry

# Views: 16589

Some days ago i'v founded a nice and useful, Kartoffel Driver Verification Tool, that allow us a rapid verification of some of the most common Device Driver weaknesses, as untrusted IOCTLs.

For example, we can see that mrxsmb.sys (which is directly related to cscdll.dll) does not trust User Mode ingoing buffer)

>kartoffel -s \\.\Shadow -n 0 -o 0x10 -z 0 -Z 0x18 -U VALUE,HANDLES -c 2000 -I 141047

In other work we're "overflowing" the CTL code 141047, output result of Kartoffel

Input Size:[0x0000] Ouput Size:[0x0018] IOCTL:[0x00141047] -> Response received [IOM notified] [ RESULTS ] _________________________________________________________ Test ID [ 0x0001 ] ------------------------------------------------------------ [ FUZZING ] - Input Buffer Size: (0x0000) Method: "" Submethod: "" - Output Buffer Size: (0x0018) Method: "VALUE" Submethod: "HANDLES" - IOCTL [ 0x00141047 ] => DEVICE: FILE_DEVICE_NETWORK_FILE_SYSTEM => ACCESS: ANY ACCESS => FUNCTION: 0x0411 => METHOD: METHOD_NEITHER [ FLAW ] - POSSIBLE DEADLOCK DETECTED - [ BUFFERS ] [INPUT BUFFER] = NULL Original Data [OUTPUT BUFFER] [0x000]: 000007E8 000007E8 000007E8 000007E8

Oh, here is the link

hXXp://www.reversemode.com/index.php?option=com_remository&Itemid=2&func=fileinfo&id=17

..and it's also Open Source!

See you to the next post

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