owasp Archives - thefluffy007

On Friday February 5, 2021, I provided a training on teaching Application Security concepts using the OWASP Top 10.

The Open Web Application Security Project or OWASP is a non-profit organization whose mission is to make application security better. Members of OWASP meet every few years to create a top 10 list of the prevalent vulnerabilities in the industry. The last list was from 2017.

The structure of my training is the first part is to present the theoretical part – concepts and definitions. The last part of the training is a practical or application of the first part of the training (theoretical).

For the practical piece I used the website – BodgeIt Store. The BodgeIt Store is an insecure app, that should NOT be deployed in commercial servers. Many will say that the BodgeIt Store is a SUPER old insecure app (it’s close to 10 years old).

The app is close to 10 years old, but I find this app is good to teach application security as there’s a scoreboard and 12 challenges to complete.

Anyway, without further ado below are my slides from my training

I also provided documents that provide a walkthrough of the BodgeIt store as well as installing and using an interception proxy such as Burp Suite.

Finally, I included instructions on how to import the OWASP Broken Authentication VM which have a series of insecure apps.

See below.

BodgeIt Walkthrough Download

Installing And Using Burp Download

Importing OWASP Broken Authentication VM Into Virtualization Download

Enjoy and keep hacking!

hacking, owasp, web application security

OWASP Hackademic Challenge 10

May 2, 2017March 3, 2021 thefluffy007

Another day, another challenge…

Today’s challenge will conclude the Hackademic Challenge.

Below is the scenario:

Would you like to become an active hacker ?
How about becoming a member of the world’s largest hacker group:
The n1nJ4.n4x0rZ.CreW!

Before you can join though, you ‘ll have to prove yourself worthy by passing the test that can be found at: http://n1nj4h4x0rzcr3w.com

If you succeed in completing the challenge, you will get a serial number, which you will use for obtaining the password that will enable you to join the group.

Your objective is to bypass the authentication mechanism, find the serial number and be supplied with your own username and password from the admin team of the site.

Clicking the link we see the following screen:

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

Looking at the line above the password line we noticed that there is a hidden field called “LetMeIn” which is set to false. What if we set this to true?

Going back to the our original screen, and clicking on Tools –> Web Developer Extension –> Forms –> Display Form Fields we see the following screen:

Changing the field from “False” to “True” and pressing the “Login” button we see the following:

Hmm… there’s an alert box that has encoding in it. Could this encoding contain the serial number?

Copying the encoding and going to Google we search for “Decoder online”. We found a website HERE

Changing the encoding type from Base64 to URL encoding and pressing “Decode” we see the following:

We have the serial number!

Going back to the challenge and pressing Enter we’re presented with the following screen:

Entering our name and serial number, and pressing the send button we see the following screen:

Lesson learned:

Our trick of right clicking and viewing the page source helped us. We noticed that there is a hidden field titled, “LetMeIn”. Developers believe that just because a field is hidden a penetration tester could not exploit these fields. This is further from the truth.

After we have tampered with the hidden field we are next encountered with encoding. Doing a quick Google search we found an encoder/decoder online that we can use to decode the encoding.

Once that decoding is done we entered our name and serial number on the next screen and we have completed the challenge.

hacking, owasp, web application security

OWASP Hackademic Challenge 8

April 30, 2017March 3, 2021 thefluffy007

Another day, another challenge.

Today’s challenge is #8 from the OWASP Hackademic Challenge.

Below is the scenario:

You have managed, after several tries, to install a backdoor shell (Locus7Shell) to trytohack.gr

The problem is that, in order to execute the majority of the commands (on the machine running the backdoor) you must have super-user rights (root).

Your aim is to obtain root rights.

Clicking on the link we see the following:

Doing a right click and “view page source” the following screen appears:

Looking at the input box, it seems that we can use bash commands to query what’s on the file system.

Typing in “ls” (list) we see the following:

the b64.txt file looks interesting… let’s open this file to see what’s inside…

Looking at the file there’s encoding. Taking a wild guess the encoding is base 64 (the file gave it away).

Going to Google and typing “base 64 decoder” we get the following link.

Putting the encoding from the base64.txt file into the decoder we get the following:

We found the username and password, yay!!!

Going back to the challenge and entering the command su (switch user) we’re prompted with the username and password.

Entering what we found in the last screen we get the following:

We’re now running the application as root (we can see that in the red text, and a congratulations at the bottom)

Lessons learned:

Once again we looked at the page source, and really didn’t find a lot of information. We did notice that we could enter bash commands and the application would interpret it.

Doing a “ls” we noticed a file on the file system. Going to said file we noticed that it was encoded. Doing a quick Google search we were able to decode the encoding and find the username and password.

A fix for this application would be to not include sensitive files on the file system for users to access. The encoding was trying to do security through obscurity – which doesn’t work. Another fix would be to not allow the user to elevate their privileges (going from a normal user to a admin root user).

hacking, owasp, web application security

OWASP Hackademic Challenge 7

April 27, 2017March 3, 2021 thefluffy007

Another day, another challenge.

This post we will solve challenge 7 of the OWASP Hackademic Challenge.

Below is the scenario:

A good friend of mine studies at Acme University, in the Computer Science and Telecomms Department. Unfortunately, her grades are not that good. You are now thinking “This is big news!”… Hmmm, maybe not. What is big news, however, is this: The network administrator asked for 3,000 euros to change her marks into A’s. This is obviously a case of administrative authority abuse. Hence… a good chance for D-phase and public exposure…
I need to get into the site as admin and upload an index.htm file in the web-root directory, that will present all required evidence for the University’s latest “re-marking” practices!
I only need you to find the admin password for me…

Good Luck!

Clicking on the link we see the following:

Right clicking on the page we see the following:

We see that there is a folder named index_files. Let’s go this folder and see what’s there…

Well look what we have here… there’s a lastlogin.txt, clicking on that file we get the following:

We see that Irene is a valid user. Let’s go back to the beginning and add Irene to the text box (with TamperData on) and see what we get.

Let’s press “OK”, and continue.

Reloading the page we now see the following in TamperData:

Well what do we have here? Inside the cookie we have the user of Irene and a userlevel of “user”. Lets try to change the userlevel to admin and see if this will solve our challenge.

After pressing out we get the following screen:

Lessons learned:

Page source provided gems in this challenge. When doing the page source we noticed that there was a folder “index_files”. When accessing this folder we see that there was information that was disclosed incorrectly that showed the last login of the application. This is bad because another user (in this case us) can impersonate a valid user.

Once we checked the grade for our user of “Irene” and looked at the tamper data results we noticed there was a cookie header that showed that our user had a privilege level of user. We noticed that this value can be changed. After change the privilege from user to admin we completed the challenge successfully.

When creating an application make sure that information is not being disclosed improperly. Make sure that there are no open folders that can be accessed on the website.

hacking, owasp, web application security

OWASP Hackademic Challenge 5

April 27, 2017March 3, 2021 thefluffy007

Another day, another challenge…

What’s the challenge today? Challenge 5 of 10 from OWASP Hackademic.

Scenario below:

You need to get access to the contents of this SITE. In order to achieve this, however, you must buy the “p0wnBrowser” web browser. Since it is too expensive, you will have to “fool” the system in some way, so that it let you read the site’s contents.

Walk through below:

Going to the website we get the following:

Viewing page source we see the following:

So… the page source is not helping us as there are no gems.

Let’s look at Tamper Data.
Reloading the page and press “Tamper” we get the following:

We don’t have any POST data to change, but we do have request headers that we can change. One field looks interesting User-Agent.

The user-agent describes the type of browser that you are using. More can be learned about user-agent HERE.

If we change the user-agent to p0wnBrowser (since we are trying to trick the user to view the contents). Changing the user-agent we get the following:

Lesson learned:

In this case we did not have POST data (response) to change, but we did have GET data (request) to change. Looking at the different headers the user-agent jumps out as one to change. Once again, if you’re stuck, Google is the way to go!

hacking, owasp, web application security

OWASP Hackademic Challenge – Challenge 4

April 27, 2017March 3, 2021 thefluffy007

Another day, another challenge. What’s the topic for today? We’re still in Cross-Site Scripting (XSS) land…

Scenario below –

A hacker informed us that this site suffers from an XSS-like type of vulnerability. Unfortunately, he lost the notes he had written regarding how exactly did he exploit the aforementioned vulnerability.
Your objective is to make an alert box appear, bearing the message “XSS!“. It should be noted, however, that this site has some protection against such attacks.

SOLUTION

Enter the site we have the following page

Trying to use the same tactic from the third challenge (alert(“XSS!”);) we get the following

We see this doesn’t work. Hmm – seems the developer has added some validation to the page.

Let’s see if we can do output encoding with XSS. Our goal is still trying to display the alert box of XSS!

Using TamperData from FireFox we see that our words are being encoded.

Going to Google and look for “XSS Filter Evasion Cheat Sheet” we come to the following page HERE

Scrolling down we see the following:

Let’s try to use the fromCharCode and see if that works.

Changing the XSS to the ASCII equivalent – we get the following:

alert(String.fromCharCode(88,83,83,33))

Putting this into the text box we get inside ‘Tamper Data”:

Pressing “XSS Me!” we get the following:

We’re not going to tamper this data, and press OK.

The screen now returns:

Lessons learned:

The application encoded certain characters “>”, “<“, “(“, “)” to try to mitigate against cross-site scripting attacks. Even with doing this we still found a way to evade the encoding by using the JavaScript function – fromCharCode from the String class. When in doubt, use Google!

Tag: owasp

Slides from Hacking OWASP Top 10 – Infinity Stones + Walkthrough at Blacks in Cybersecurity

OWASP Hackademic Challenge 10

OWASP Hackademic Challenge 8

OWASP Hackademic Challenge 7

OWASP Hackademic Challenge 5

OWASP Hackademic Challenge – Challenge 4