Natas Level 10 Writeup: Command Injection 2

URL: http://natas10.natas.labs.overthewire.org

1. Objective

Find the password for natas 11

2. Method

Open the Website:

Visit the provided URL in your browser.

Check the Source Code:

Bypassing the Filter:

Use command substitution $(command) to bypass the filter.

Enter the search term a $(find /etc/natas_webpass -name natas11 2>/dev/null).

Explore the Output:

Examine the output, revealing files like index-source.html.

Find the natas11 Password File:

Use the command a $(find /etc/natas_webpass -name natas11 2>/dev/null).

Locate the Password:

The password for natas11 is revealed

            >! /etc/natas_webpass/natas11:[Level 11 Password]
            dictionary.txt:
            dictionary.txt:African
            dictionary.txt:Africans
            dictionary.txt:Allah

Success

Use the password to proceed to the next level

______________________________________

NthApostle

Comments

Natas Level 11 Writeup: XOR Encryption

1. Objective Find the password for natas level 12. 2. Introduction When we open the webpage for Natas 11, we are greeted with the following message: Cookies are protected with XOR encryption. What is XOR: XOR is a binary operation that returns true (1) only when the number of true inputs is odd. It compares corresponding bits of two binary numbers, resulting in 1 for differing bits and 0 for identical bits. Example: Let's consider two binary numbers, A = 1010 and B = 1101. 1010 X 1101 ------- 0111 In this case, A XOR B equals 0111 in binary, or 7 in decimal. XOR Property: If A XOR B = C, then A XOR C = B. Verification: Let A = 1010, C = 0111, and find B. 1010 X 0111 ------- 1101 The result is 1101 in binary, which is B. So, A XOR C equals B, confirming the XOR property. This property holds true for any combination of A, B, and C, demonstrating that given any two values, you can find the third using XOR. 3. Exploration Ch...

Natas Level 7 Writeup: Directory Traversal

URL: http://natas7.natas.labs.overthewire.org Open the Website : Exploration : Page Navigation: Clicking on the "home" and "about" pages reveals the following links: http://natas7.natas.labs.overthewire.org/index.php?page=home http://natas7.natas.labs.overthewire.org/index.php?page=about Hint in Source Code: Inspecting the source code provides a hint about how the application includes pages. Exploit : URL Parameter Manipulation: Replace the page parameter with the desired file path: http://natas7.natas.labs.overthewire.org/index.php?page=/etc/natas_webpass/natas8 Success : You have successfully manipulated the URL parameter to access the password for natas8. Proceed to the next level using the acquired information. PS: In Natas0, it was stated that All passwords are also stored in /etc/natas_webpass/. E.g. the password for natas5 is stored in the file /etc/natas_webpass/natas5 and only readable by natas4 and natas5 That is how we know that the file...

Natas Level 12 Writeup: File Upload Vulnerability

1. Objective Find the password for natas level 13. 2. Introduction The first thing we see is a form that gives us the ability to upload 'JPEG' images. If proper checks have not been put in place to validate the uploaded file, it is highly likely that we may have a File Upload Vulnerability. A File Upload Vulnerability is a security issue that arises when proper checks are not implemented to validate uploaded files. In this level, we explore the possibility of exploiting such a vulnerability. 3. Exploration Let's use the 'View source code' button to check what clues we can find there. The process that takes place on the server. A file name is generated before the page is served to the user The filename is stored in a hidden field called filename When a user uploads a file, the server checks if the filename field is present It prepares for the file to be saved in the ...

Cyber Security Blog

Search This Blog