Technical Information

Brief overview of the risk:
This security update resolves one publicly disclosed vulnerability and two privately reported vulnerabilities in Microsoft DirectShow. The vulnerabilities could allow remote code execution if a user opened a specially crafted QuickTime media file.
Detailed Information on the risk:

A remote code execution vulnerability exists in the way that Microsoft DirectShow parses QuickTime media files. This vulnerability could allow code execution if a user opened a specially crafted QuickTime file. If a user is logged on with administrative user rights, an attacker who successfully exploited this vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.

Further information on this exploit is available at : MS09-028