Microsoft has just released its official patch for the WMF 0-Day. In the Microsoft Security Bulletin MS06-001, Microsoft states in its executive summary:
This update resolves a newly-discovered, public vulnerability. The vulnerability is documented in the “Vulnerability Details” section of this bulletin.
Note This vulnerability is currently being exploited and was previously discussed by Microsoft in Microsoft Security Advisory 912840.
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.
We recommend that customers apply the update immediately.