From here we see the link being sent to the root folder (line 1, POST / HTTP/1.1), and we know something on the other side is taking it as input do do a conversion.

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If we go and look at the script a simple script that runs rm -rf downloads, which is cleaning the downloads folder. We can take this opptunity to inject some code in, I put a bash one-liner in for a reverse shell.

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The --recursion allows us to fuzz directories we find in our initial fuzzing attempt, the -fw 154 was to remove some messy false positives.

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As with my previous walk-throughs, I will be placing hints within the post before outright telling you what to do, with the hope that a nudge is all you need.

First thing I did from this point was load up Burpsuite and capture the traffic after I hit the convert button, and see what exactly is going on.

I do two scans, an all purpose scan against all ports with -p- and then an aggressive scan with -A against the noted ports.

This is the browser taking our youtube video id (#ytid), attaching it to the youtube URL and then sending it to the root folder of the web server (the / just after .post at the start).

You should find that nothing happens, a basic command is not executing and just gives you an error. The fact it breaks, and gives an actual error, means there is likely limited error handling and flow control.

Once I had this I tried using more complicated commands, such as trying to use netcat to call back to our machine, however I kept running into issues with the command getting snapped into bits by the script.

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After doing that, you can transfer pspy, make it executable and boot it up. I transferred my static version by hosting a python server and using wget. I couldn’t use the dynamically linked version due to library errors.

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So, now we can begin attempting different types of bypasses and see if we can get a command to work on the machine. I picked the simple commands of ls and pwd, I picked two in an attempt to avoid any false negatives throwing me off.

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From this point you are on the machine and can do some enumeration to find the flag, which is located at /var/www/html/admin

After that, I did the same thing again but this time with the network tab of the developers tools open to see if the site was calling out to any scripts, it flagged up /js/jquery-3.5.0.min.js. At this point I had also looked at the page source, which also showed another script called main.js.

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This meant I tried multiple conversions, reopened the web page multiple times etc. However, eventually something jumped out on the list.

The machine itself is a Linux box with a simple foothold (in theory) with some defenses, after that we are needing to do some in-depth enumeration than I have done before to get root.

We have the front page of a website and nothing else, so directory busting is something I start first. That way, while that is working I can also poke around with the website and hit two birds with one stone.

The results of the command are hidden within the error, so it is important to know what a normal error looks like allowing you to pick out the differences easily.

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As you can guess, admin, is an interesting directory. Going to it we are prompted to login, however…We have no credentials.

That gives us a little bit of information to go off of, we will likely be looking to break some form of program or script.

So for this, with no tools active, I just put in a valid entry and an invalid entry and checked what the differences were. Nothing dramatic happens, apart from some wording on the page changes.

Honestly, I am not the biggest fan of web application pentesting but I did enjoy tampering with the traffic a little here, likely because it wasn’t actually a lot to test.

Firstly you need to do some enumeration, mainly because you need to know if you are using pspy32 or pspy64, which depends on the architecture of the system. I check this with the dpkg — print-architecture command, but there are multiple other ways.

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We will be jumping the gun a little bit, and going straight into using pspy, however, doing the standard enumeration tasks of sudo-l, looking for interesting files etc should be done also. Even if just for practise.

Once the script is uploaded, as per fig 4, you can then send through a command to execute it (but set up your listener first!). I originally tried $(./.sh) but that didn’t work, had to use $(bash${IFS}