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[Kaspersky Industrial CTF 2018] Doubles Write-up (Pwn635)

nc doubles.2018.ctf.kaspersky.com 10001 doubles Let’s start with looking at file information and protections.

The file is an 64-bit executable that is dynamically linked and its stack is not executable. Let’s disassemble its main function.

It simply calls a… Continue Reading →

[Kaspersky Industrial CTF 2018] Expression Write-up (Web50)

http://expression.2018.ctf.kaspersky.com/ The website allows us to send two numbers/tokens and an operation among +, -, *, /. Let’s send 1 + 2 to test it.

It calculated the result and gave us a token which is obviously base64 encoded…. Continue Reading →

[P.W.N. CTF 2018] Important Service Write-up (Pwn259)

Very Important Service. Flag in /opt. nc importantservice.uni.hctf.fun 13375 a30577b33492f15d382ef665ee6abda2.tar.xz a30577b33492f15d382ef665ee6abda2.tar.xz MIRROR Let’s look at the file information first.

It is a 64-bit ELF pie executable which is dynamically linked and not stripped. Let’s check its protections.

The… Continue Reading →

[P.W.N. CTF 2018] Kindergarten PWN Write-up (Pwn204)

Thats still kindergarten stuff. Flag in /opt. nc kindergarten.uni.hctf.fun 13373 48800cb1ffbd78f067d68425baa25d88.tar.xz  48800cb1ffbd78f067d68425baa25d88.tar.xz MIRROR Let’s start with looking at the file information.

It is a 64-bit ELF executable which is dynamically linked and not stripped. Let’s take a look at… Continue Reading →

[P.W.N. CTF 2018] BabyPWN Write-up (Pwn115)

This is the babypwn challenge – what are you waiting for student? nc baby.uni.hctf.fun 25251 Binary Libc Binary Mirror Libc Mirror Let’s check the file information first.

It is an 64-bit ELF executable which is dynamically linked and not… Continue Reading →

[P.W.N. CTF 2018] H!pster Startup Write-up (Web216)

Our on-campus start-up was hacked. The hacker somehow deleted the only admin user… Can you login to the admin interface and revert it? When we look at the source code, we notice the url of the admin panel.

It… Continue Reading →

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