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Internet Explorer bug patched only a week ago now being exploited

Patch Tuesday - Malware Wednesday

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Hackers have latched onto a vulnerability in Internet Explorer patched by Microsoft last week as a useful way to spread malware.

The vulnerability is CVE-2012-1875 – which was patched in MS12-037 as part of the June edition of Microsoft's Patch Tuesday – and it is being exploited in the wild. Attacks are typically delivered by JavaScript code embedded in websites, some of which are actually legitimate. Windows users who visit these sites using unpatched boxes become infected thanks to the JavaScript code, in what industry insiders commonly describe as a drive-by download attack.

The security bug stems from memory mismanagement in Internet Explorer, or more particularly a use-after-free bug. Technologies built into the latest versions of Windows – including DEP (data execution prevention) and ASLR (address-space layout randomisation) – are meant to make this sort of attack harder but have both come up short in this instance.

'Net users are advised to patch Windows systems to defend against the exploit, if they haven't done so already. A good write-up of the vulnerability can be found in a blog post by Sophos here.

The flaw in IE is unrelated to the a browser bug associated with news of "state-sponsored attackers" and Google that made the news last week. ®

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