Grace Hopper

Description

Grace Brewster Hopper (née Murray; December 9, 1906 – January 1, 1992) was an American computer scientist, mathematician, and United States Navy rear admiral. One of the first programmers of the Harvard Mark I computer, she was a pioneer of computer programming who invented one of the first linkers. Hopper was the first to devise the theory of machine-independent programming languages, and the FLOW-MATIC programming language she created using this theory was later extended to create COBOL, an early high-level programming language still in use today. - Wikipedia Entry

Chal: Command this webapp like this Navy Real Admiral

Challenge URL

Challenge Link

Solution

• The challenge says to enter a command but ls does not work.
• Use dir -a to list directory contents even hidden files
• ls, cat, more, less, head, tail commands are blacklisted.

• So to view file contents, we can use strings or just grep for the flag format to view file contents

• Running strings on cyberheroines.sh gives us the flag

FLAG

CHCTF{t#!$_!s_T#3_w@Y}