This morning we released six security bulletins, three Critical and three Important, addressing 12 CVE’s. Please apply the Internet Explorer update right away as it poses the most risk of all the bulletins due to severity and exploitability.The Internet Explorer update addresses the vulnerability described by Security Advisory 977981. We hope that the table and commentary below will help you prioritize the deployment of the other updates appropriately.
This month, we’ve also released an advisory and non-security updates changing Windows behavior around credential forwarding. Maarten Van Horenbeeck explains the current protections against credential reflection and credential forwarding in a blog post at http://blogs.technet.com/srd/archive/2009/12/08/extended-protection-for-authentication.aspx. Definitely take a look if you are concerned about safeguarding credentials against these types of attacks.
Also, we have also released an advisory describing a security mitigation offered to all customers through Windows Update. The Indeo Codec is an older codec that is known to have several security vulnerabilities. Instead of fixing one-off vulnerabilities in this older codec, we’ve released an update that blocks this codec from running in common attack scenarios, such as watching videos or browsing the internet. See Security Advisory 954157 for more information.
We hope that helps you understand this month’s security updates. We recommend that you apply all security updates but especially please prioritize and deploy MS09-072 as it has a Critical severity rating, an Exploitability Index rate of 1 (“Consistent Exploit Code Likely”), and public Proof of Concept (PoC) code is available.
Have a safe holiday season and let us know if you have any questions.
Special thanks to the entire MSRC Engineering team for their work on this month’s security bulletins! Thanks Andrew Roths for the help with this blog post.
- Jonathan Ness, MSRC Engineering
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