Microsoft released 8 security bulletins on Tuesday (April 14, 2009) to fix remote code execution and denial of service vulnerabilities.
It is not an overstatement to say; an unpatched Windows system is an invitation to disaster.
If you have updates enabled, patches will be downloaded routinely. Careful users will verify that patches, have, in fact, been applied.
If Windows Automatic Update is not enabled on your system, then you should logon to the MS update site and download and apply these patches immediately.
Vulnerability issues and the corresponding patches:
MS09-010/KB923561 – Important (XP, 2000, 2003): There are four bugs (two previously disclosed publically, two previously undisclosed) that affect a variety of word processing documents, that can allow remote code execution exploits to occur.
MS09-011/KB961373 – Critical (XP, 2000, 2003): This patch closes a hole that let attackers execute a remote code execution attack through MJPEG files; the bug is in DirectX 8.1 and 9.0x.
MS09-012/KB952004/KB956572 – Important (XP, Vista, 2000, 2003, 2008): This patch resolves four holes in Windows that have already been publically disclosed. The hole allows an attacker who is already logged onto the system to escalate their privileges and take full control of the system.
MS09-013/KB960803 – Critical (XP, Vista, 2000, 2003, 2008): This patch addresses three bugs in the Windows HTTP Services system; one of them allows remote code execution which allows an attacker to completely own a system. This is a “must patch” item for all Windows systems.
MS09-014/KB963027 – Critical (XP, Vista, 2000)/Important (2000, 2003): This is a cumulative security update for Internet Explorer 5, 6, and 7. Some of the fixes address already public bugs, some deal with privately disclosed exploits. You should install this patch immediately. Users with IE8 do not need this patch.
MS09-015/KB959426 – Moderate (XP, Vista, 2003, 2008)/Low (2000): This patch takes care of a problem with the Windows Search Path function that could enable an escalation of privileges.