sec-labs team proudly presents:
Local ZoneAlarm Firewall (probably all versions - tested on v3.1)
Device Driver vulnerability.
by Lord YuP
04/08/2003
I. BACKGROUND
ZoneAlarm is a very powerful and very common nowadays firewall for
Windows produced by Zone Labs. (http://www.zonelabs.com)
II. DESCRIPTION
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:
LpInBuffer:
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"
III. IMPACT
The after sucessfull exploitation, attacker can obtain FULL SYSTEM
CONTROL! In the worse for attacker option, OS can fault!
IV. REFERENCE - DEVICE DRIVER ATTACKS
The white paper about Device Drivers Attacks can be found at
http://sec-labs.hack.pl the papers section.
--
sec-labs team [http://sec-labs.hack.pl]
This archive was generated by hypermail 2b30 : Tue Aug 05 2003 - 15:16:10 PDT