Microsoft recently posted a security bulletin with critical information regarding a potential Exchange Server vulnerability.
This security update resolves publicly disclosed vulnerabilities and one privately reported vulnerability in Microsoft Exchange Server. The most severe vulnerabilities are in Microsoft Exchange Server WebReady Document Viewing and could allow remote code execution in the security context of the transcoding service on the Exchange server if a user previews a specially crafted file using Outlook Web App (OWA). The transcoding service in Exchange that is used for WebReady Document Viewing is running in the LocalService account. The LocalService account has minimum privileges on the local computer and presents anonymous credentials on the network.
This security update is rated Critical for all supported editions of Microsoft Exchange Server 2007 and Microsoft Exchange Server 2010. For more information, see the subsection, Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by updating the affected Oracle Outside In libraries to a non-vulnerable version. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerabilities entry under the next section, Vulnerability Information.