Microsoft has released a much smaller Patch Tuesday update this month, one month after breaking its record for the largest Patch Tuesday update in history.
The three bulletins cover a total of 11 vulnerabilities across Microsoft Office and Forefront Unified Access Gateway (UAG). Just one of the bulletins is rated “Critical” – MS10-087, which addresses five vulnerabilities in Microsoft Office.
Among those five is a rich text format stack buffer overflow vulnerability Microsoft considers likely to be exploited.
“The bulletin is rated Critical for Office 2007 and Office 2010 due to a preview pane vector in Outlook that could trigger the vulnerability when a customer views a specially crafted malicious RTF (Rich Text Format) file,” explained Jerry Bryant, group manager of response communications for Microsoft Security Response Center, in a blog post. “The update also addresses an Office vector for the vulnerability described in Security Advisory 2269637, which has been referred to as ‘DLL Preloading’ and ‘Binary planting’.”
The final bulletin, also rated Important, plugs four vulnerabilities in UAG, which is part of Microsoft Forefront. The most significant of these bugs could allow elevation of privilege if a user clicks on a malicious link on a website, Bryant noted, adding the update is only being offered through the Microsoft Download Center at the moment.
Josh Abraham, security researcher from Rapid7, said the critical bulletin should be at the top of enterprise patch lists this month.
“Based on the huge amount of patches from last month, some customers might be up to speed while others are still struggling to catch up – this would depend on the unique customer and the strength of their vulnerability management program,” Abraham said. “Another thing that is interesting is that Microsoft has been breaking their own records with the number of bulletins they are releasing in a given month. To help everyone overall, a better approach would be to keep a semi-constant rate of patches every month so that system administrators are not over burdened during specific months.”
He added that administrators should also remain vigilant for attacks targeting the recently disclosed zero-day in Internet Explorer as well. That vulnerability has not been patched.
So far, Microsoft said, none of the vulnerabilities addressed in today’s update have been targeted by attackers.
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