According to an advance notice from the Redmond, Wash. software vendor, five of the 13 bulletins will be rated "critical" because of the risk of remote code execution attacks.
The majority of the vulnerabilities affect the company's flagship Windows operating system while the others will deal with security holes in the Microsoft Office productivity suite.
This chart details the affected OS versions and severity ratings for the bulletins, which will be released next Tuesday (February 9, 2010).
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While the details of the vulnerabilities will be kept a secret until Patch Tuesday, Microsoft says one of the bulletins will address a known privilege escalation flaw (see advisory) in the Windows kernel.
That vulnerability was publicly disclosed by a Google security researcher who code to demonstrate the risk of privilege escalation attacks that affect every release of the Windows NT kernel -- from Windows NT 3.1 (1993) up to and including Windows 7 (2009).
Microsoft has already warned that a malicious hacker could exploit this vulnerability to run arbitrary code in kernel mode. For an attack to be successful, the attacker must have valid logon credentials. The flaw does not affect Windows operating systems for x64-based and Itanium-based computers.
There are at least two open, publicly known vulnerabilities that will NOT be patched this month. They are the most recent Internet Explorer data leakage bug (see advisory) details at Black Hat DC and a denial-of-service vulnerability in the Server Message Block (SMB) protocol.
Exploit code for the SMB flaw was released by researcherFollowing the publication of stop responding until manually restarted.