Saturday, January 7, 2017

Base CTF 2016 Pwn Challenges and Writeup ( Part V )

Pwn06: Try Harder!

Solution:


let begin with debugger.


Damn, he wanted “BABE” ! ;)
So, let find the crash point and combine into final payload.


  Done ! :)

Enjoy guys !
Ye Yint Min Thu Htut

Base CTF 2016 Pwn Challenges and Writeup ( Part IV )

Pwn05: Talk another one !

Solution:


It is simple buffer overflow challenge. You have to find crash point and function address to print flag.

Let create pattern to find crash point as smart way.


Save as pwn.
Run with the debugger and load the payload to get offset.


 Then, let explore the suspected function.


 Got it at 0x0804846b !

 Let create final payload to get flag.

 Pwned ! :)

Enjoy guys !
Ye Yint Min Thu Htut

Base CTF 2016 Pwn Challenges and Writeup ( Part III )

Pwn04: Bypass me !

Solution:

For this challenge, you have to bypass ARP filtering to get grant.
Let seek for authorized MAC address.



Found 00:0C:29:04:a1:a , you can fuzz [0 to F] to get last char and replace with your existing MAC address.  


Easy ? :)

Cheers !
Ye Yint Min Thu Htut

Base CTF 2016 Pwn Challenges and Writeup ( Part II )

Pwn03: Dun forgot your environment!

Solution:


“System is calling date” is hint for that challenge. It is also principle privilege escalation challenge.
Let create our own “Date” to get grant.


Pwned ! :)

Cheers ! 
Ye Yint Min Thu Htut

Base CTF 2016 Pwn Challenges and Writeup ( Part I )



For Base CTF 2016 (Myanmar Cyber Security Competition), our core team member “Ye Yint Min Thu Htut” facilitated in making some challenges. Our challenges are primarily aimed for entry level participants of CTF to polish their CTF knowledge. We will deliver more hardcore challenges in coming CTFs once you ready :).
Congrats to all solvers of our challenges.
Ok, let start the writeup for your ref.

Pwn02: Find me!

Solution:




Yea, it was inspecting your UID for grant.
You needed to find correct UID or bypass it. We will use bypass method.
Run it in debugger.

Damn, checkpoint is there.


Let set a breakpoint, and change EAX value to become UID 1256 ( 0x4e8 ).




 Granted ! :)


Enjoy guys !
Ye Yint Min Thu Htut