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HomeHomeDNN Open Source...DNN Open Source...Module ForumsModule ForumsBlogBlogURGENT! Javascript injection brakes the public viewURGENT! Javascript injection brakes the public view
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7/28/2008 10:50 PM
 
ch3nyong

Joined: 4/14/2008
Posts: 17

Hi all, I have a critical issue with blog module!

My site allows registered users to post comments, and moderation is disabled.

When someone posted such comment:

<script>

 
New Post
7/29/2008 2:37 AM
 
Dario Rossa

www.dariorossa.it
Joined: 11/4/2006
Posts: 799

Hi ch3nyong,

the module team has been discussing long time about this weakness. This issue has been taken into account during the development of version 03.05.00, and script injection has been disabled along with most HTML tags. Version 03.05.00 has already been submitted to the release tracker, so you will not have to wait long to see this enhancement in action. 

In the meanwhile I suggest you to use moderation even on registered users to avoid malicious injections. I also remind you that you can easily check which registered user added the malicious script and eventually block him.

Best regards,
Dario Rossa
 
New Post
7/29/2008 9:12 AM
 
ch3nyong

Joined: 4/14/2008
Posts: 17

Hi Dario Rossa,

I appreciate alot on your response, and thank you for the indept explanation!

However, I still find it not tolerable when it comes to this kind of simple injection.

I have been an PHP guy until recently when I was assigned to work on a .NET CMS, and DNN was selected based on a few strengths.

Now that the site is in its final week before it goes live, and we are failed on the security due to this minor issue.

What we need is simply a javascript validation checking (e.g. halt submission if <script> tag is found, or sth similar) before postback is done.

Do you have any idea on how we can have quick fix on this?

Thank you!!
 
New Post
7/29/2008 11:30 AM
 
Dario Rossa

www.dariorossa.it
Joined: 11/4/2006
Posts: 799

Hi ch3nyong,

you're right, this weakness to malicious script injection should had been taken into account earlier. However the next version will include a powerful filter to avoid any issues. To fix it in the current version you will need to open the actual module project, modify it and recompile. A good place to put the filter would be just before the comment is added to the database. I would suggest you to filter out also the HTML tags other than <img>, <b>, <u>, etc. because I experimented that also these ones can break up the page layout.

Best regards,
Dario Rossa
 
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HomeHomeDNN Open Source...DNN Open Source...Module ForumsModule ForumsBlogBlogURGENT! Javascript injection brakes the public viewURGENT! Javascript injection brakes the public view


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