Collaborative Development.md

Collaborative Development

Overview

75 points

Category: General Skills

Tags: #generalskills #git

Description

My team has been working very hard on new features for our flag printing program! I wonder how they'll work together? You can download the challenge files here: challenge.zip

Approach

Unzipping the challenge.zip archive we have a git local repository.

Listing the contents of the unzipped folder reveals a single file.

$ ls
flag.py

$ cat flag.py 
print("Printing the flag...")

Nothing interesting found in git log, blame or status commands.

Listing the branches of the repository, we see three separate feature branches as well as our current main branch we have checked out currently :

$ git branch
  feature/part-1
  feature/part-2
  feature/part-3
* main

Solution

Lets progressively checkout the feature branches and check the contents of the flag.py file :

$ git checkout feature/part-1
Switched to branch 'feature/part-1'

$ ls
flag.py

$ cat flag.py 
print("Printing the flag...")
print("picoCTF{...........", end='')

$ git checkout feature/part-2
Switched to branch 'feature/part-2'

$ cat flag.py 
print("Printing the flag...")

print("redacted", end='')

$ git checkout feature/part-3
Switched to branch 'feature/part-3'

$ cat flag.py 
print("Printing the flag...")

print("...........}")

Putting the pieces of the flag together we have :

picoCTF{...........redacted.............}

Where the actual flag value has been redacted for the purposes of this write up.