Microsoft recently issued an out-of-band security advisory for a vulnerability in the server service that could allow remote code execution (MS08-067). Due to the criticality of the vulnerability, Microsoft has released a fix out-of-band (i.e., not on the regular Patch Tuesday).
It is strongly recommended that patches be tested and applied to all vulnerable systems you administrate as soon as possible. According to one source, targeted attacks using this vulnerability to compromise fully-patched Windows XP and Windows Server 2003 systems have been seen.
Advisories
Additional Information
Steve
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