Category: Pwn Points: 300 Solves: 53 Description:
h3y... can you leave me a note?
For this challenge we were given a binary and the libc used on the server. Up front I should say, I didn't solve this challenge the way it was intended. Other writeups out there will go over the proper way. This writeup goes over my way.
Let's take a peek at the binary. First, verify the type:
$ file memo
memo: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=55dd2460edb641c16f624ddda467a6d4ddc8b14d, stripped
Strings had an interesting line in it: "this is hidden memo pad". We'll come back to that later. Giving it a run we see that it is menu driven:
What's user name: test
Do you wanna set password? (y/n) y
Password must be set to 32 digits or less.
Done! have a good day test
1. Leave message on memo
2. Edit message last memo
3. View memo
4. Delete memo
5. Change password
Let's look at the options in turn.
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