Hijacked!

Challenge

Someone planted a file on our computer (the shell server), but we don’t know what it is! The only clue that we have is that it’s owned by a user called l33t_haxx0r. Can you figure out the flag?

Solution

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$ find / -user l33t_haxx0r 2>/dev/null
/var/www/html/index.html

This gives an html file with the flag hidden inside it:

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[..]
<!--
t
h
e

f
l
a
g

i
s

e
a
s
y
c
t
f
{
c
0
m
p
1
e
t
3
l
y
_
r
3
k
t
}
-->

[..]

Flag