The DRM technology is bundled with Windows Server 2003, Windows XP and Windows Vista, but does not affect Windows Vista.
Danish security website Secunia rates the vulnerability as 'less critical', the second step on a five step severity scale. The risk to end users is limited because a successful exploit requires attackers to have an account on the targeted system.
Symantec first disclosed the issue on a company blog 20 days ago. Microsoft told the firm at the time that it was aware of the issue and was working on a fix.
Microsoft issued a security advisory on Monday in which it disclosed the ongoing attacks.
The company also linked to a patch that Macrovision has since issued, and said that Windows systems will be updated as part of the next Patch Tuesday update scheduled for 13 November.
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iTnews Executive Retreat - Security Leaders Edition
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