Serpentine

Tags: General Skills, Python
Author: LT ‘syreal’ Jones

Description

Find the flag in the Python script!
Download Python script

Hints

1. Try running the script and see what happens
2. In the webshell, try examining the script with a text editor like nano
3. To exit nano, press Ctrl and x and follow the on-screen prompts.
4. The str_xor function does not need to be reverse engineered for this challenge.

   Approach

   If we try running it and printing the flag from there, the program says “Oops! I must have misplaced the print_flag function! Check my source code!”. On line 20, we see a function called print_flag, line 35 a function called main and line 79 and 80,

   if __name__ == "__main__":
     main()
   

   Essentially what this does is tell other readers that this code is meant to be run and that it runs the main function upon being run. What we want to do is print the flag so we can replace main() with print_flag()

   if __name__ == "__main__":
     print_flag()
   

   Flag

   picoCTF{7h3_r04d_l355_7r4v3l3d_ae743140}