Microsoft issued seven patches on Tuesday - one more than expected - as part of its monthly Patch Tuesday update cycle. Three of the updates earn the dreaded rating of critical.

As expected, Redmond is yet to address two critical bugs in its Word office application that have become the subject of Trojan attacks over the last week or so.

Another critical flaw involves a vulnerability in Windows Media Player. The flaw stems from an unchecked buffer in Windows Media Player code involved in handling Advanced Streaming Format (ASF) files. The vulnerability might be exploited by malicious Web-based Windows Media Player content or if an infected file is opened through affected Windows Media Player versions. The flaw affects all versions of Windows Media Player 6.4, 7.1, 9 and 10.

The third critical flaw for December involves a Vulnerability in Visual Studio 2005 which, once again, lends itself to remote code execution. Developers are urged to apply patches to defend their systems from attack.

Microsoft's four other bulletins this month address flaws rated as "important" involving Outlook Express, the SNMP network management protocol, a privilege elevation flaw in Windows and a bug in remote installation services. A full run down of Microsoft's updates this month - critical or otherwise can be found here. ®

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• MS plans 'dirty dozen' patch release (9 February 2007)
• MS January patch update omits critical Word fix (10 January 2007)
• MS culls Patch Tuesday litter (8 January 2007)
• Trojan targets unpatched Word flaw (again) (11 December 2006)
• Unpatched Word flaw menaces civilisation (6 December 2006)
• Five critical vulns mark November Patch Tuesday (15 November 2006)
• Windows Update glitches derail Patch Tuesday (11 October 2006)
• Industry comment Patch Tuesday - and other days of the week (11 October 2006)
• Unofficial patches defend against further IE flaw (3 October 2006)
• Vista joins MS patch treadmill (18 August 2006)