Things I learned from DarkCTF

Forensics

Wolfie's Contact

How to mount an EWF image file (E01) on Linux[link]:

ewfmount IMAGE.E01 ./rawimage/
mkdir mountpoint # mount ./rawimage/ewf1 ./mountpoint -o ro,loop,show_sys_files,streams_interace=windows

AW

If the file is named "spectre", they may be implying that I should inspect the spectrogram 🤦‍♂️

Free Games

The writeup I read used autopsy to search the file system for. I tried to figure out why grep didn't work for me and I realized the link I was looking for is split into two lines. To prevent this I could use a tool or look for "PencakSilat" instead of "http".

Crcket

This challenge was about fixing a png. It required knowledge of the PNG structure, and could use the help of png-parser.

Cryptography

Pipe Rhyme

First RSA challenge.

Linux

Linux Starter

Escape rbash restricted shell through SSH:

ssh <User>@<IP-Adress> -t "bash --noprofile"

Find Me

Use lsof to restore deleted files [If they are still opened by a process][link]:

cp /proc/<PID>/fd/<FD> <Restored File>

Secret Vault

Base85 is a thing, and it looks something like this:

\0Ec5e;DffZ(EZee.Bl.9pF"AGXBPCsi+DGm>@

Also, I liked this syntax of while loop to crack the vault:

nr=0; while true; do nr=$((nr+1)); if [[ $(./vault $nr) != *"wrong"* ]]; then ./vault $nr; echo $nr; fi; done;

Time Eater

Sometimes you just have to keep enumerating... 😒

Misc

QuickFix

????

P_g_G_i_P_t

What can I do with PGP Fingerprint?

Grap the PGP key with:

gpg --recv-key <PGP Fingerprint>

In this challenge, the key doesn't contain user ID so this won't work. Another way to obtain a key from a fingerprint is by using an online lookup like this one.

OSINT

Eye & Time Travel

Google lens and Yandex are good tools for reverse image search.

PWN

roprop

Finally learned how to ROP!

Web

Source

You can present very large numbers in PHP in this short manner:

echo 9e9; //9000000000

Dusty Notes

Fuzzing input fields might yield nice errors.

Chain Race

Apache2 Interesting Default Files

  • /etc/apache2/apache2.conf

  • /etc/apache2/ports.conf

Race Condition Vulns

The idea is to force a program to handle tasks in an unintended order. Usually happens when several threads are operating on the same resources with a time gap between initialization and usage.

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