BUUCTF-Ezsql1

1.打开靶机

打开第一个链接

2.万能密码

使用万能密码：a' or 1 #

密码为随意

第二个用kali打开

3.ssh连接靶机

ssh ctf@284490d0-7600-4c65-9160-5ced02f45633.node5.buuoj.cn -p 28191

由题可知密码为123456

4.找到并修改index.php文件

找到index.php文件

#内容如下：

<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>让我访问</title>
    <link href="http://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="http://cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet">
    <link rel="stylesheet" type="text/css" href="css/htmleaf-demo.css">
    <style type="text/css">
        .form-bg {
            padding: 2em 0;
        }

        .form-horizontal {
            background: #ffffff;
            padding-bottom: 40px;
            border-radius: 15px;
            text-align: center;
        }

        .form-horizontal .heading {
            display: block;
            font-size: 35px;
            font-weight: 700;
            padding: 35px 0;
            border-bottom: 1px solid #f0f0f0;
            margin-bottom: 30px;
        }

        .form-horizontal .form-group {
            padding: 0 40px;
            margin: 0 0 25px 0;
            position: relative;
        }

        .form-horizontal .form-control {
            background: #f0f0f0;
            border: none;
            border-radius: 20px;
            box-shadow: none;
            padding: 0 20px 0 45px;
            height: 40px;
            transition: all 0.3s ease 0s;
        }

        .form-horizontal .form-control:focus {
            background: #e0e0e0;
            box-shadow: none;
            outline: 0 none;
        }

        .form-horizontal .form-group i {
            position: absolute;
            top: 12px;
            left: 60px;
            font-size: 17px;
            color: #c8c8c8;
            transition: all 0.5s ease 0s;
        }

        .form-horizontal .form-control:focus + i {
            color: #00b4ef;
        }

        .form-horizontal .fa-question-circle {
            display: inline-block;
            position: absolute;
            top: 12px;
            right: 60px;
            font-size: 20px;
            color: #808080;
            transition: all 0.5s ease 0s;
        }

        .form-horizontal .fa-question-circle:hover {
            color: #000;
        }

        .form-horizontal .main-checkbox {
            float: left;
            width: 20px;
            height: 20px;
            background: #11a3fc;
            border-radius: 50%;
            position: relative;
            margin: 5px 0 0 5px;
            border: 1px solid #11a3fc;
        }

        .form-horizontal .main-checkbox label {
            width: 20px;
            height: 20px;
            position: absolute;
            top: 0;
            left: 0;
            cursor: pointer;
        }

        .form-horizontal .main-checkbox label:after {
            content: "";
            width: 10px;
            height: 5px;
            position: absolute;
            top: 5px;
            left: 4px;
            border: 3px solid #fff;
            border-top: none;
            border-right: none;
            background: transparent;
            opacity: 0;
            -webkit-transform: rotate(-45deg);
            transform: rotate(-45deg);
        }

        .form-horizontal .main-checkbox input[type=checkbox] {
            visibility: hidden;
        }

        .form-horizontal .main-checkbox input[type=checkbox]:checked + label:after {
            opacity: 1;
        }

        .form-horizontal .text {
            float: left;
            margin-left: 7px;
            line-height: 20px;
            padding-top: 5px;
            text-transform: capitalize;
        }

        .form-horizontal .btn {
            float: right;
            font-size: 14px;
            color: #fff;
            background: #00b4ef;
            border-radius: 30px;
            padding: 10px 25px;
            border: none;
            text-transform: capitalize;
            transition: all 0.5s ease 0s;
        }

        @media only screen and (max-width: 479px) {
            .form-horizontal .form-group {
                padding: 0 25px;
            }

            .form-horizontal .form-group i {
                left: 45px;
            }

            .form-horizontal .btn {
                padding: 10px 20px;
            }
        }
    </style>
</head>
<body>
<div class="htmleaf-container">
    <header class="htmleaf-header">
        <h1>我还可以教你，敦 dua 郎哦。</h1>
        <div class="htmleaf-links">
        </div>
    </header>
    <div class="demo form-bg">
        <div class="container">
            <div class="row">
                <div class="col-md-offset-3 col-md-6">
                    <form class="form-horizontal" method="get" action="">
                        <span class="heading">让我访问</span>
                        <div class="form-group">
                            <input type="text" class="form-control" id="inputEmail3" placeholder="用户名" name="username">
                        </div>
                        <div class="form-group help">
                            <input type="password" class="form-control" id="inputPassword3" placeholder="密码"
                                   name="password">
                        </div>
                        <div class="form-group help">
                            <input type="submit" class="form-control" id="inputSubmit">
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
    <div class="related">
    </div>
</div>
</body>
</html>
<h4 style="text-align: center; color: #000000">
<?php
error_reporting(0);
include 'dbConnect.php';
$username = $_GET['username'];
$password = $_GET['password'];
if (isset($_GET['username']) && isset($_GET['password'])) {
    $sql = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
    $result = $mysqli->query($sql);
    if (!$result)
        die(mysqli_error($mysqli));
    $data = $result->fetch_all(); // 从结果集中获取所有数据
    if (!empty($data)) {
        echo '登录成功！';
    } else {
        echo "用户名或密码错误";
    }
}
?>
</h4>
$

增加两行

$username = addslashes($username);
$password = addslashes($password);

最终index.php的内容如下

<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>让我访问</title>
    <link href="http://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    <link href="http://cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet">
    <link rel="stylesheet" type="text/css" href="css/htmleaf-demo.css">
    <style type="text/css">
        .form-bg {
            padding: 2em 0;
        }

        .form-horizontal {
            background: #ffffff;
            padding-bottom: 40px;
            border-radius: 15px;
            text-align: center;
        }

        .form-horizontal .heading {
            display: block;
            font-size: 35px;
            font-weight: 700;
            padding: 35px 0;
            border-bottom: 1px solid #f0f0f0;
            margin-bottom: 30px;
        }

        .form-horizontal .form-group {
            padding: 0 40px;
            margin: 0 0 25px 0;
            position: relative;
        }

        .form-horizontal .form-control {
            background: #f0f0f0;
            border: none;
            border-radius: 20px;
            box-shadow: none;
            padding: 0 20px 0 45px;
            height: 40px;
            transition: all 0.3s ease 0s;
        }

        .form-horizontal .form-control:focus {
            background: #e0e0e0;
            box-shadow: none;
            outline: 0 none;
        }

        .form-horizontal .form-group i {
            position: absolute;
            top: 12px;
            left: 60px;
            font-size: 17px;
            color: #c8c8c8;
            transition: all 0.5s ease 0s;
        }

        .form-horizontal .form-control:focus + i {
            color: #00b4ef;
        }

        .form-horizontal .fa-question-circle {
            display: inline-block;
            position: absolute;
            top: 12px;
            right: 60px;
            font-size: 20px;
            color: #808080;
            transition: all 0.5s ease 0s;
        }

        .form-horizontal .fa-question-circle:hover {
            color: #000;
        }

        .form-horizontal .main-checkbox {
            float: left;
            width: 20px;
            height: 20px;
            background: #11a3fc;
            border-radius: 50%;
            position: relative;
            margin: 5px 0 0 5px;
            border: 1px solid #11a3fc;
        }

        .form-horizontal .main-checkbox label {
            width: 20px;
            height: 20px;
            position: absolute;
            top: 0;
            left: 0;
            cursor: pointer;
        }

        .form-horizontal .main-checkbox label:after {
            content: "";
            width: 10px;
            height: 5px;
            position: absolute;
            top: 5px;
            left: 4px;
            border: 3px solid #fff;
            border-top: none;
            border-right: none;
            background: transparent;
            opacity: 0;
            -webkit-transform: rotate(-45deg);
            transform: rotate(-45deg);
        }

        .form-horizontal .main-checkbox input[type=checkbox] {
            visibility: hidden;
        }

        .form-horizontal .main-checkbox input[type=checkbox]:checked + label:after {
            opacity: 1;
        }

        .form-horizontal .text {
            float: left;
            margin-left: 7px;
            line-height: 20px;
            padding-top: 5px;
            text-transform: capitalize;
        }

        .form-horizontal .btn {
            float: right;
            font-size: 14px;
            color: #fff;
            background: #00b4ef;
            border-radius: 30px;
            padding: 10px 25px;
            border: none;
            text-transform: capitalize;
            transition: all 0.5s ease 0s;
        }

        @media only screen and (max-width: 479px) {
            .form-horizontal .form-group {
                padding: 0 25px;
            }

            .form-horizontal .form-group i {
                left: 45px;
            }

            .form-horizontal .btn {
                padding: 10px 20px;
            }
        }
    </style>
</head>
<body>
<div class="htmleaf-container">
    <header class="htmleaf-header">
        <h1>我还可以教你，敦 dua 郎哦。</h1>
        <div class="htmleaf-links">
        </div>
    </header>
    <div class="demo form-bg">
        <div class="container">
            <div class="row">
                <div class="col-md-offset-3 col-md-6">
                    <form class="form-horizontal" method="get" action="">
                        <span class="heading">让我访问</span>
                        <div class="form-group">
                            <input type="text" class="form-control" id="inputEmail3" placeholder="用户名" name="username">
                        </div>
                        <div class="form-group help">
                            <input type="password" class="form-control" id="inputPassword3" placeholder="密码"
                                   name="password">
                        </div>
                        <div class="form-group help">
                            <input type="submit" class="form-control" id="inputSubmit">
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
    <div class="related">
    </div>
</div>
</body>
</html>
<h4 style="text-align: center; color: #000000">
<?php
error_reporting(0);
include 'dbConnect.php';
$username = $_GET['username'];
$password = $_GET['password'];

$username = addslashes($username);
$password = addslashes($password);

if (isset($_GET['username']) && isset($_GET['password'])) {
        $sql = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
        $result = $mysqli->query($sql);
        if (!$result)
            die(mysqli_error($mysqli));
        $data = $result->fetch_all(); // 从结果集中获取所有数据
        if (!empty($data)) {
            echo '登录成功！';
        }
    else { echo "用户名或密码错误"; }
}
?>
</h4>