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Which is more secure - Internet Explorer or Firefox?

I recently had an interesting inquiry from a Twitter follower asking the question "Which would you say is safest, Firefox or IE?". Not a question that hasn’t been asked before, but in light of the happenings of the past few days a far deeper question than it may seem on the surface.

I recently had an interesting inquiry from a Twitter follower asking the question Which would you say is safest, Firefox or IE?Not a question that hasnt been asked before, but in light of the happenings of the past few days a far deeper question than it may seem on the surface.I work with (and play with for that matter) many people who are fans of alternative operating systems, whose natural response to any question that includes choosing between Microsoft and anything else is always to not choose MicrosoftWe need to more carefully consider this based on merit and not brandMicrosofts Internet Explorer has been the king of browsers on the internet for 10 or more years nowAlthough its market dominance has been diminishing somewhat as of late, it still holds a commanding lead.Microsoft also had a rocky start when it comes to the security of IE, but has worked hard to improve it and made lots of progressOne benefit IE brings to the corporate IT table is the ability to centrally manage it through Group Policy Objects, and centrally update through Windows Update and WSUS.The now famous patch Tuesday can be considered another benefit to receiving predictable updates that processes and scheduling can be designed aroundThe other side of this is that you sometimes must wait a month or more for a fix (Like the current IE exploit being targeted as noted by  SophosLabs).ActiveX has also been a large worry for administrators as many controls are needed in a business workplace, yet allowing users to install and update ActiveX controls gives 3rd parties the ability to run malicious code on users PCs.The final story for Microsoft is the introduction of Internet Explorer 8While IE8 is more compliant than any previous version, it still trails behind Firefox, Chrome, and SafariInternet Explorer 8 makes large improvements toward secure design and awareness of interoperability.Mozilla Firefox on the other hand has a different set of issues to contend withIt is more difficult to centrally manage than IE, and has no predictable update release pattern.By default Firefox will check with Mozilla for updates, but does require that the user accept the updateThey must have enough privilege to apply the update, and cannot be behind an SSL proxy that may interfere with its signing certificate.Firefox being open source means that flaws are often discovered by the public and developers, and patches are quick on the heels of new vulnerabilitiesFirefoxs open nature also means it has a large suite of available security extensions like NoScript that are able to protect against JavaScript attacks, as well as click-jacking and other techniques to exploit browsers.Recently Firefox has faced new challenges from Google, Microsoft, and others in the browser security arena, and the Mozilla team seem up to the challenge of maintaining Firefoxs security respect.Searching on the National Vulnerability Database for Firefox bugs rated medium or higher since January 2009 results in 56 separate disclosures (Some of which have more than one flaw).Microsoft has reported 34 for the same period, with the same statistical note as to many having multiple issues in a single advisory.The more interesting part that seems to divide the commercial software giant from the open source driven Firefox is the methods they choose to use to inform the public.The Firefox vulnerability in its JIT compiler was discovered by a Firefox developer and resulted from a public bug that was filed last Thursday (July 10th, 2009)The Firefox community has debated whether it was appropriate for the bug to be disclosed publicly which led to its exploitation the following Monday.On the other hand, The Register has published an article suggesting Microsoft knew of the most recent IE flaw for more than a year before making a disclosure and patching the flaw.There is no clear answer to which browser is more secureFind Article, the only conclusion a security expert can come to is that surfing the web is always a potentially risky activityHopefully this information provides you with more facts to help you make an informed decision.

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This article was written by Chester Wisniewski of Sophos and is published here with their full permission. Sophos provides full data protection services including:security softwareencryption softwareantivirus, and malware protection.

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