🥷Linux Ninja Skills - TryHackMe

CTF Writeup / Walkthrough for Ninja Skills Room

Room Link : Ninja Skills

Sharpen your ninja skills on linux

Initial Access

SSH Credentials

username: new-user
password: new-user

Preparation

First get the list of files that are available to us

cd files && touch thm-files.txt
## copy and paste the file names into something like, thm-files.txt

The list should look something like this

8V2L
bny0
c4ZX
D8B3
FHl1
oiMO
PFbD
rmfX
SRSq
uqyw
v2Vb
X1Uy

Next get the paths of the files which we can later use for reference purpose

cat thm-files.txt | while IFS= read line; do find / -name "$line" -type f 2>/dev/null; done | tee files.txt

Tasks

Question 1 : Which of the above files are owned by the best-group group(enter the answer separated by spaces in alphabetical order)

cat files.txt | while IFS= read line; do ls -laSh $line; done | grep "best-group"

Question 2 : Which of these files contain an IP address?

# Get the IP address along with the file name
cat files.txt| while IFS= read -r line; do grep -E -o '([0-9]{1,3}\.){3}[0-9]{1,3}' "$line" 2>/dev/null && echo "$line"; done

Question 3 : Which file has the SHA1 hash of 9d54da7584015647ba052173b84d45e8007eba94 ?

cat files.txt | while IFS= read -r line; do sha1sum $line; done | grep "9d54da7584015647ba052173b84d45e8007eba94"

Question 4 : Which file contains 230 lines?

cat files.txt | awk -F/ '{print $NF}' | sort -u > a.txt
cat thm-files.txt | sort -u > b.txt
diff a.txt b.txt
## the one file that is missing is marked with >

Question 5 : Which file's owner has an ID of 502?

cat files.txt | while IFS= read -r line; do ls -ln $line; done
# check the 3rd column which has all the IDs
# -rw-rw-r-- 1 502 501 14K Oct 23  2019

Question 6: Which file is executable by everyone?

cat files.txt | while IFS= read -r line; do ls -ln $line; done
### Look for -rwxrwxr-x 

Thank You for reading ❤️ Happy Hunting 😎