Web Patching 1 to 3
Web Patching 1 to 3
SySTeM | 12844 Reads | Here’s my article on web patching one to three, for these challenges you will need some basic knowledge of php.
Web Patching 1 On this challenge you see that the code echo“s the variable: $_POST[‘username’]. For example, if you typed “floobman mc doodle” in the username box and hit submit it would say “Logged in as floobman mc doodle.” But, if you tried injecting some html tags into the box, as the script don’t filter html tags it will output whatever html you put in. You should know the name of this. If you don’t know how to get rid of html tags from being inputted, try googling.
Web Patching 2 Right, you can see that this one has an sql query, so that should give you an idea of what kind of exploit this is. To patch it, you have to know that you need to make it add a slash in front of the apostrophes and quote marks to stop the exploit. Again, if you don’t know the function for this, google.
Web Patching 3 Moving on to the third patching challenge, this script is meant to include whatever file you choose through the variable: $page = $_GET[‘page’]. The script also adds “.php” onto the end of the included file, so if you typed: something.php?page=something, it would include itself. But using our knowledge of poison null bytes, you could try this: something.php?page=/etc/passwd/%00 to try and view the password file. The way you are suppsoed to patch this is the opposite of web patching two.
I hope this article has helped you, I realise it is quite a short article, but I couldn’t think of any way to make it longer.
Mr_Cheese 18 years ago
yeah excellent. gives just the right amount of information away :) This will certainly help a few people who are stuck on it.
ghost 18 years ago
Good articles, concise without being bland or giving too much away.
I just had the exploit types wrong haha.
ghost 16 years ago
thanks a lot this is well written and straight to the point without any spoilers. :D
ghost 16 years ago
I like the article.. but I have a thought.
For the third one, couldn't the exploit be RFI? I thought that what needed to be done was to filter out '?'
ghost 16 years ago
Good article, no spoilers and really just gave an idea what to google… Google is my friend but it helps to know what to think of…