Standard Forum

[lemmin]

http://meisnermusic.awardspace.com

 

I made a little forum and would like you see how it works. Feel free to try to break it, as long as you tell me how you did it. I didn't do very much user input checking so I wouldn't be surprised if someone can do something funny to it. Please post as many times as you want (can). I would like to make sure the backend is working properly.

 

Thank you.

 

P.S. I am really impressed by awardspace.com's free web hosting.

[Gath]

No spam control.

 

Sql injection possible.

 

http://meisnermusic.awardspace.com/index.php?s=%3Cmarquee%3E

 

 

 

(Have to run, i'm late, cant check more -.-)

[lemmin]

Haha, I love the entire div post scrolling across the screen. I guess I shouldn't allow html.

[php_tom]

There, I broke it by making a new topic called '<textarea>'. Maybe you should 'striptags()' before you accept a thread, etc. And I'd make people sign in to post anyway.

[lemmin]

Ok, I fixed the tags. I am planning to implement the login feature, but I figured it would be easier for people to test this with out it, for now.

 

EDIT: I also fixed the injection, now. (probably)

[php_tom]

Hehe... either somebody totally wrecked your site, or too many people are testing...

Too many connections

It looks much better, although I haven't finished testing it completely. I'll try again later.

[php_tom]

Here's a funny one (although not really a vulnerability):

http://meisnermusic.awardspace.com/index.php?s=-10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000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000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

 

Request-URI Too Large

The requested URL's length exceeds the capacity limit for this server.

 

Now I'm just playing... its not easy to get a 414 error!

[akitchin]

chokes on single quotes:

 

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'this is \" some stuff that <marquee>might trip you up</

 

that portion started with a single quote.

[agentsteal]

Cross Site Scripting:

http://meisnermusic.awardspace.com/?a=n&s="><marquee><h1>vulnerable</marquee>

[lemmin]

Thanks for all the input, guys.

I am pretty sure that I found a blind sql injection vulnerability that allows users to query the database:

If there something after the digit, it just directs you to the home page and it isn't even querying from the URI that you put in. The weird times I would guess are because of the free server.

 

chokes on single quotes:

 

Wow, I swear I work around that, I must have changed something on accident.

 

Cross Site Scripting:

That is pretty cool, I will see what I can do about that.

[phpSensei]

maybe you should make the new topic message field to a text area....

 

 

[lemmin]

It seems that escaping apostraphes with a slash "\'" works on my end, but not when I upload to awardspace. I fixed the cross site scripting, though. Is this a mysql version thing?

maybe you should make the new topic message field to a text area....

 

It is! It's a "<input type=textarea>" which isn't a valid type, but it defaults to text. I'm not really working on cosmetics, yet. I will definately have a bigger box for the message field, as well as labels for the fields.

[akitchin]

a textarea is its own tag, not a type of input.

[lemmin]

Yeah, I was just joking about that.

 

I switched to mysql_real_escape_string() and it doesn't choke anymore; however, it prints a littler backslash before it, on output. I am assuming this is mysql settings so I am not too concerned that it does that on a free host. Am I right about that?

 

Can anyone else make this site do anything weird, after the changes?

[php_tom]

Not really a vulnerability, but I can reply to a non-existent post, e.g.,

  http://meisnermusic.awardspace.com/index.php?s=2&t=1234567890&a=n

Nobody will see this, but it probably populates your DB with extra stuff.

 

So maybe check that a post/topic exists before letting someone reply...

[Guardian-Mage]

You really meant basic didn't you.Anyway, you should use bbcode, not HTML, and limit bbcode so javascript won't work.

[lemmin]

Somone claims to have overwritten a previous topic on the site. The only way I can think of this happening is by sending a custom POST variable to my site. I assume that is possible, is that likely how it was done? The code uses only POST variables when creating a topic.

 

If this IS what has happened, what is the best way to prevent against such a thing? If not, any ideas on how this was possible?