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Category:   Application (Firewall)  >   ZoneAlarm Vendors:   Zone Labs
ZoneAlarm Buffer Overflow in VSDATANT Device Driver Yields System Privileges to Local Users
SecurityTracker Alert ID:  1007420
SecurityTracker URL:
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Aug 5 2003
Impact:   Execution of arbitrary code via local system, Root access via local system

Version(s): Tested on 3.1
Description:   A buffer overflow vulnerability was reported in the ZoneAlarm firewall in the device driver. A local user can execute arbitrary code with full privileges.

Lord YuP of sec-labs reported that a local user can send a specially crafted message to the VSDATANT TrueVector Device Driver to overwrite memory. A local user can reportedly gain ring0 privileges (full system control).

The local user can send one signal to overwrite a specific memory location (to contain the local user's arbitrary code) and then send second signal to cause the system to jump to the user-supplied arbitrary code.

Some exploit example details are provided in the Source Message.

Additional details about exploiting device driver flaws is available at:

Impact:   A local user can execute arbitrary code with ring0 (system) privileges.
Solution:   No solution was available at the time of this entry.
Vendor URL: (Links to External Site)
Cause:   Boundary error, Input validation error
Underlying OS:  Windows (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 11 2003 (Vendor Confirms and Responds) Re: ZoneAlarm Buffer Overflow in VSDATANT Device Driver Yields System Privileges to Local Users
The vendor has confirmed the flaw and is working on a fix.

 Source Message Contents

Subject:  [Full-Disclosure] [sec-labs] Zone Alarm Device Driver vulnerability
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit

     sec-labs team proudly presents:

     Local ZoneAlarm Firewall (probably all versions - tested on v3.1)
     Device Driver vulnerability.
     by Lord YuP


   ZoneAlarm is a very powerful and very common nowadays firewall for
   Windows produced by Zone Labs. (


   The driver installed with ZoneAlarm is vulnerable, and can be
   exploited  in cause of that attacker can gain full system control
   (ring0 privileges).    

   By sending properly formatted message to the ZoneAlarm Device
   Driver (VSDATANT - TrueVector Device Driver) you can cause an
   device driver     memory overwrite. 
   Overview, sending faked buffors with specific singal can cause
   a miscellaneous code execution:

   First signal should be send to overwrite specific memory location,
   in the current case it can be one of the case-if-statement.

     push 0 					;overlapped
     push offset bytes_returned			;bytes returned
     push 4					;lpOutBuffer size
     push STATMENT_INSTRUCTION_POINTER		;memory to overwrite
     push 0					;lpInBuffer size
     push 0					;lpInBuffer
     push 8400000fh				;guess what X-D
     push vsdatant_handle			;device handle
     call DeviceIoControl			;send it!

   If the correct STATMENT_INSTRUCTION_POINTER will be put the address
   should be overwritten to 00060001h (example). After memory
   allocation     at this address (inserting shellcode bla bla bla), the
   second signal must     be send to jump into inserted code. That can
   be done with sending another     signal:

     db STATMENT_OVERWRITTEN_NUMBER			;where to jump
     db 7 dup (0)					;data?
     dd temp_buff					;temp buffer
     db 10 dup (0)					;some space

   This one should be send with another dwIoControl code, however we
   are  no longer publishing any exploits, even PoC (die kiddies)

   After sending second faked message, device driver will jump 
   to the STATEMENT offset which was overwritten by first "signal"


   The after sucessfull exploitation, attacker can obtain FULL SYSTEM
   CONTROL! In the worse for attacker option, OS can fault!


   The white paper about Device Drivers Attacks can be found at the papers section. 

sec-labs team []
Content-Type: application/pgp-signature

Version: GnuPG v1.2.1 (GNU/Linux)

Full-Disclosure - We believe in it.


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