Sar - Walkthrough [Vulnhub]

Here's my solution for Sar.
The machine can be downloaded from here.

Nmap
Scanning for all TCP ports.
nmap -sC -sV -p- 192.168.1.111


We find only 1 open port.

Directory Scan
Browsing the web and checking the source, we did not find any hint.


Using dirb to scan for directories.
dirb http://192.168.1.111


We find an interesting entry in /robots.txt file.


Lets browse /sar2HTML.


We found an exploit, and we get this 47204.txt.


What does the exploit says-


The paramter- plot= , is vulnerable to code execution.


Getting Access
Now we upload a php reverse shell file.





We also give full permission to the file- ;chmod 777 shell.php
To run the exploit, we browse 192.168.1.111/sar2HTML/shell.php
and on the other hand we start the netcat listener.



We get the reverse shell.

User Flag.


Privilege Escalation
We find cron jobs , which runs in every 5 minutes.


We see that, finally.sh will execute the file- write.sh and we have full permission on write.sh


Now we encode the payload in base64 and place it in file- write.sh and on other hand we start the netcat listener.



We wait for 5 minutes and we have a shell.


Root Flag.




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