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Sometimes i like to alternating amid attainable challenges (e.g. HTB boxes) area your ambition can accept annihilation in the ambit of vulnerabilities and scoped challenges, area you apperceive (at atomic the topic) of the claiming so you can apply to advance in that specific task. This time is web appliance exploitation.



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OverTheWire Natas seems to be like a acceptable alpha for that affair as it starts attainable and seems to get to added and added andvanced exploitations at every level.



Let’s start:

Disclaimer: i will be appliance the browser Firefox ESR (default Kali Linux Browser), whenever i advertence some affection you can accept it’s on that browser unless i acutely specify it’s addition apparatus or browser.



Visiting http://natas0.natas.labs.overthewire.org/ we get a folio with the afterward message:

Right beat on an abandoned amplitude we can go to the antecedent cipher of the folio and we can see an HTML animadversion absolute the countersign for Natas 1.

This the right-click ambience card is disabled but to attainable the antecedent cipher appearance folio we can aloof prepend the url with view-source: like this

view-source:http://natas1.natas.labs.overthewire.org/

We get the countersign for natas 2 like the antecedent level.

This time the bulletin of the folio states that “there is annihilation on this page”.We booty a attending at the antecedent cipher and we acquisition that in absoluteness there is something: a baby angel of a pixel with src on files/pixel.png.

This agency there is a files binder on the server and abyssal at

http://natas2.natas.labs.overthewire.org/files/

we acquisition that there is additionally addition file.

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Opening users.txt we acquisition the countersign for the abutting level.

We get addition bulletin that there is annihilation on that page, but we don’t assurance those letters and we booty the accepted attending at the antecedent cipher and we acquisition article that hides a absolutely big hint.

Well at aboriginal i didn’t anticipate a lot about that account and i anticipation there was some hidden binder or folio on the web server and i started a gobuster dir bruteforce with the common.txt book from dirb.Well this did assignment but it was absolutely overkill: the alone added attainable folio was…. robots.txt!

Yeah the chat Google was a nice adumbration to say that the folio was hidden from google, and robots.txt is a accepted book acclimated by chase agent crawlers area you can additionally specify folders that shouldn’t be catched.

Well robots.txt reveals that there is an hidden binder at /s3cr3t/ and by abyssal we acquisition addition binder with a users.txt book absolute the countersign for the abutting level.

This time we get accustomed by this message:

This bulletin stays the aforementioned back auspicious the folio with f5 but changes back we bang on the Refresh Folio button provided.

So we charge to acquisition a way to change that 4 to a 5 and removing index.php and we should be chargeless to go.

For this assignment i acclimated Burp Suite Community to ambush and accept a attending at the appeal of the folio and i begin the band-aid appealing easily:

Changing the accredit to the one we charge unlocks the folio and reveals us the countersign for the abutting puzzle.

This one gets apparent calmly appliance Burp Suite too. Auspicious the folio and intercepting the appeal we see and absorbing cookie that is sent.

Setting loggedin to 1 gives admission to the password.

This time we accept a anatomy that needs an ascribe and we can additionally booty a attending at the folio antecedent cipher (this the php that generates it).

The absorbing allocation of cipher is this one:

We can see a capricious $secret that is compared with $_POST[‘secret’] but area does it gets initialized? Well at the top of the cipher we can see that a .inc book is included. This is a assemblage in PHP programming that back a book has this addendum it’s usually meant to be alien into scripts and not run as is.

Navigating to /includes/secret.inc we get a bare folio that back inspected has some PHP cipher with a $secret variable. Appliance that amount as ascribe on the capital website gives us admission to the abutting challenge.

This time there are two accessible links. Back beat on one of them we can apprehension that the url changes with a constant (example in about page):

http://natas7.natas.labs.overthewire.org/index.php?page=about

changing about to .htaccess changes the folio in this way:

Oh, this agency that the server has a agenda bridge bug.The instructions of the natas claiming tells us that there is a binder /etc/natas_webpass/ absolute all the passwords for the assorted levels.

Replacing .htaccess with ../../../../etc/natas_webpass/natas8 gets us the password.

Don’t be bamboozled to try additionally natas9, natas10 etc… the natas8 book was aloof accustomed permission to be apprehend by the user that runs the php script.

Just like the aftermost one we charge to acquisition a actual input, and we additionally accept the PHP antecedent cipher available.

We see that there is an encodedSecret capricious and a action to encodeSecret.The cipher that checks the ascribe uses the encodeSecret action to transform the key and analyze to the encodedsecret, so we basically accept to about-face the action on the encodedSecretUsing the afterward PHP cipher we can break it and acquisition our way to the band-aid putting it as ascribe on the capital page.

This time we accept a anatomy that taken an ascribe accord us words absolute that accurate input. Is it magic? NO. Let’s bang the Appearance sourcecode button and attending how it works.

Well the magic’s dead, the php cipher passes cipher to the basal arrangement appliance the action passthru(string).Taking a attending at the PHP chiral we acquisition out that by absence passthru is absolutely afraid and there are suggestions on how to abate this problem. None of the precautions are taken actuality so we can basically go and inject commands in that $key variable.

Using ;cat ./../../../../etc/natas_webpass/natas10;file as ascribe we book out the abutting akin password.

Last but not atomic we accept addition agnate claiming but this time the cipher is arrested with a approved announcement that doesn’t admittance the afterward characters:

All these characters are advantageous to concatenate commands in linux command line. So how can we do a agnate ambush of natas 9 after appliance them?I never encountered addition way to concatenate commands in linux (if you apperceive amuse acquaint me in the comments) but alive that the basal command accomplished is grep we can acquisition on the internet if there is a way.

Well the acknowledgment can be acquisition on GTFOBins .

Basically the grep command can be acclimated in an adventitious way:

by appliance ‘’ as the concern we account all of the agreeable of the files, so to accept the countersign for akin 11 we aloof charge to use this in the website as input:

And we apprehend the book after appliance added commands!

Natas seems a absolutely absorbing claiming and the progression gives you an befalling to apprentice new things in the web appliance aegis acreage if you are a abecedarian after actuality afflicted by the absolute possibilities of a boot2root challenge’s machine.

I will column in the approaching the solutions to the abutting exercises, break acquainted and chase me if you don’t appetite to absence them.

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