TryHackMe | Empline Walkthrough

 

Are you good enough to apply for this job?

Link:- https://tryhackme.com/room/empline


Get all the flags to complete the room.

Run a nmap scan to check for open ports



Port 80 is open. Let us visit it



Since this room hints at applying for a job- Let us click on “Employment”. This does not lead anywhere. Check source code of page :-



Seems it refers to job.empline.thm/careers

Let change our /etc/hosts file and link the IP to this



Now the url works:-



Click on “Show all jobs” and the “mobile dev” position



We can click on “Apply to Position”



This page allows us to upload a file. Interesting…

Let’s find the OpenCats version by going to jobs.empline.thm:-



A google search for exploit for opencats 0.9.4 leads us to an article by doddsecurity(.)com . CVE-2019–13358

Following the exploit method. Create a .docx file using python or libreoffice with some text in the file. In my case the text is “Fun time”.



unzip the .docx file and then edit word/document.xml



Add the below after first line 

<!DOCTYPE test [<!ENTITY test SYSTEM ‘file:///etc/passwd’>]>

and change the text “Fun time” to 

&test;



Save the changes back to the docx file



Upload the file and see the passwd file:-



Replace the second line in word/document.xml to 

<!DOCTYPE test [<!ENTITY test SYSTEM ‘php://filter/convert.base64-encode/resource=config.php’>]>

instead and save the changes back to docx file using zip command. Upload the file .



Decode the base64 to see username and password



Try to login to database as james



Read the “user” table



we see username and password for a number of users



we are able to crack george’s password using crackstation



Login as george



Found user.txt

Run the below command to check capabilities:-

getcap -r / 2>/dev/null

Using Ruby to exploit.

Make a password to change root’s password in /etc/shadow



Exploit and change root’s password in /etc/shadow to that of above. Login as root.



root.txt found !

That’s it. See you guys in the next room :)


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