How to protect a website from malware redirects

Not long ago, hackers took over Oracle's and installed a JavaScript code on the site that redirected visitors and attacked their systems with a BlackHole exploit kit. Is there any way to prevent websites from automatically redirecting, aside from (in this case) turning off JavaScript?

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There are ways to control JavaScript or block JavaScript redirects on the client side by using browser plug-ins like NoScript. Potentially, a more general browser security tool may be used that might be included in a host intrusion prevention system (HIPS) or antimalware suite to block JavaScript redirects. A Web proxy is another good way to block redirects from a network.

Regardless of these tactics, there are many different redirect methods, that don’t use JavaScript, that can be used by attackers. A Web server can be configured to redirect webpages by issuing a HTTP 3xx redirect command, sending a browser to a different website. There is even an HTML tag for meta-refreshes that could generate a redirect. Many popular websites now perform URL shortening, which is a form of redirection, so you may want to evaluate if blocking redirection is worth the effort given the decrease in functionality.

If a network's endpoints have been hardened from malware attacks, the minimal security risk from redirection should not significantly increase the number of malware infections.

This was first published in April 2012

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