Fri 25 Jan 2008
Another Firefox Flaw, in Its Extensions
Posted by Syd Tash under Alerts
A bug has been found in the Firefox browser, or more precisely, in its user interface, called Chrome. Using certain extensions or plugins, an attacker could scan your computer to see what applications and data you have available. A more serious attack might be mounted later, using this information.
The vulnerable extensions are those in a so-called flat file, not in a .jar or Java archive file. Download Statusbar and Greasemonkey are two such plugins that use the flat file structure, and both have been updated to prevent this exploit. Mozilla, the publisher of Firefox, is working on a fix to this problem, but it is not ready yet. The attack works by enticing you to visit a malicious Web site, from which your PC gets scanned.
I have never liked browser extensions, because they can compromise the security of the browser, as we see in this example. However, there is an extension for Firefox called NoScript. It blocks all Javascript, Java, Flash, etc. by default, from all Web sites you visit.
You choose which individual sites you trust enough to allow to run code on your computer, by simply clicking an icon. In other words, you create a whitelist, or safe list, of sites which are allowed to run code in your browser. Check it out here: http://noscript.net/
Syd Tash is a noted computer security consultant and author of How to Protect Your Computer Online. He has been keeping Internet surfers safe and secure since the last century. Find out how he does it; protect your own computer with five layers of protection right here:
= > http://MyPCSecuritySite.com
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