OverTheWire: Natas Level 7 – #appsec #webapp #websecurity #wargames

Another day, another challenge…

In today’s blog post we will solve level 7 from the Natas wargame challenge.

Let’s begin.

Going to the following link, and entering username “natas7” and password “7z3hEENjQtflzgnT29q7wAvMNfZdh0i9” we see the following:

Natas7_WarGame_1

Natas7_WarGame_2

Hmm… we see a Home and About links. Let’s click the links and see what happens.

Natas7_WarGame_3

Natas7_WarGame_4

After clicking the links we see there’s not much that’s showing on the screen.

Let’s view the source and see if there are any hints there.

Doing a right click, view page source we see:

Natas7_WarGame_5

Hmm… we see a comment that says, “password for webuser natas8 is in /etc/natas_webpass/natas8”

How can we use this information?

Looking at the above screenshots of Home and About – we notice that at the end of the URL it’s referencing a page. For instance for the home page it’s “page=Home” and for About it’s “page=About”. Let’s try to change the page name to the hint that was provided to us.

Changing the URL to: http://natas7.natas.labs.overthewire.org/index.php?page=/etc/natas_webpass/natas8, we see…

Natas7_WarGame_6

the flag!

OverTheWire: Natas Level 6 – #appsec #webapp #websecurity #wargames

Another day, another challenge…

In today’s blog post we’re going t solve level 6 in the Natas wargame.

Let’s begin.

Going to the following link and entering the username of “natas6” and password of “iX6IOfmpN7AYOQGPwtn3fXpbaJVJcHfq” we see the following:

Natas6_WarGame_2

Natas6_WarGame_3

Doing a right click, view source we see:

Natas6_WarGame_4

Hmm… there’s not much in here, except there’s a view sourcecode. Let’s see what this source code will yield us…

Natas6_WarGame_5

Looking at the middle of the page, we see that there’s php code (code between <?…?>), we notice that there’s an include/secret.inc. Let’s see if we can access this file and see what’s inside the file.

Changing the URL to “natas6.natas.labs.overthewire.org/includes/secret.inc” we see:

Natas6_WarGame_6

… a blank page. Let’s do a right click, view page source to see if there are nuggets hidden beneath the surface.

Doing a right click, view page source we see the following:

Natas6_WarGame_7

Hmm… looks like we find the secret.

Let’s enter this into the input box and see if this unlocks the level.

Entering the secret above into the input box we get:

Natas6_WarGame_8

Natas6_WarGame_9

We found the flag!

OverTheWire: Natas Level 4 – #appsec #webapp #websecurity #wargames

Another day, another challenge…

Today’s blog post we’re going to solve level 4 from the Natas wargame.

Let’s begin.

Going to the following link we see:

Natas4_WarGame_1

After entering the username of “natas4” and password of “Z9tkRkWmpt9Qr7XrR5jWRkgOU901swEZ” we get the following:

Natas4_WarGame_2

Hmm… we’re not allowed access because we’re coming from an invalid URL. Let’s see if we can change that.

In a previous blog, I explained how to user Tamper Data. Tamper Data allows you to modify HTTP requests and responses to see if the web page will behave differently.

We’re going to use Tamper Data for this challenge.

 

Starting Tamper Data, and going to the level 4 we see:

Natas4_WarGame_4

We see that the referrer shows natas4, what happens when we change it to natas5?

 

Changing the referrer to natas5, and clicking OK we see:

Natas4_WarGame_5

Natas4_WarGame_6

We found the flag!

OverTheWire: Natas Level 2 – #appsec #webapp #websecurity #wargames

Another day, another challenge…

In today’s blog post we’re going to solve level 2 from the Natas wargame.

Let’s begin.

Going to the following link we see:

Natas2_WarGame_1

We’ve acquired the password for level 2 from the level 1 challenge (screenshot below):

Natas1_WarGame_3

Entering the username of “natas2” and password from the above screenshot we see the following:

Natas2_WarGame_2

Nothing on the page, eh… I don’t believe that.

Let’s try, right click view source and see what we get.

Natas2_WarGame_3

We notice there’s an image source of a pixel.

Clicking this link we see:

Natas2_WarGame_4

It truly is just a pixel. What if we remove the “pixel.png”? Maybe there are other files on the system. Let’s try it.

Removing the “pixel.png” and pressing Enter we see:

Natas2_WarGame_5

We see an extra file – users.txt. I wonder what’s in it.

Clicking users.txt, we noticed that it lists the different username and passwords. The one we want is the fourth row – natas3. We’ve found natas3 password!

OverTheWire: Natas Level 1 – #appsec #webapp #websecurity #wargames

Another day, another challenge…

In today’s blog post we’re going to solve level 1 of the Natas challenge.

Let’s begin.

Going to the following URL we see:

Natas1_WarGame_1

From level 0, we were able to find the password of level 1 (screenshot below):

Natas_WarGame4

Entering the username of “Natas1” and password from the screenshot we see:

Natas1_WarGame_2

Looking at the message we noticed that right-clicking has been blocked. How can we get around this?

By adding “view-source” in the beginning of the URL.

Doing this we see:

Natas1_WarGame_3

We’ve acquired the password for level 2!

PicoCTF 2017 a Brief Introduction

Another day, another challenge…

Today’s blog post will discuss another CTF – PicoCTF.

The target audience for PicoCTF is a computer security game that is aimed at middle school and high school students, but anyone can join and play.

Topics explored are: forensics, cryptography, reverse engineering, web exploitation, binary exploitation, and miscellaneous challenges.

To learn more, go here.

Happy hacking!