Szolgáltatóknak

Today we released eight security bulletins addressing 19 CVE’s. Three bulletins have a maximum severity rating of Critical while the other five have a maximum severity rating of Important. We hope that the table below helps you prioritize the deployment of the updates appropriately for your environment. Bulletin Most likely attack vector Max Bulletin Severity Max Exploit-ability Likely first 30 days impact Platform mitigations and key notes MS13-090(ActiveX killbit) Victim browses to a malicious webpage.

In June 2013, we released EMET 4.0 and customer response has been fantastic. Many customers across the world now include EMET as part of their defense-in-depth strategy and appreciate how EMET helps businesses prevent attackers from gaining access to computers systems. Today, we’re releasing a new version, EMET 4.1, with updates that simplify configuration and accelerate deployment.

In light of recent research into practical attacks on biases in the RC4 stream cipher, Microsoft is recommending that customers enable TLS1.2 in their services and take steps to retire and deprecate RC4 as used in their TLS implementations. Microsoft recommends TLS1.2 with AES-GCM as a more secure alternative which will provide similar performance.

Microsoft is recommending that customers and CA’s stop using SHA-1 for cryptographic applications, including use in SSL/TLS and code signing. Microsoft Security Advisory 2880823 has been released along with the policy announcement that Microsoft will stop recognizing the validity of SHA-1 based certificates after 2016. Background Secure Hashing Algorithm 1 (SHA-1) is a message digest algorithm published in 1995 as part of NIST’s Secure Hash Standard.

Over the weekend we became aware of an active attack relying on an unknown remote code execution vulnerability of a legacy ActiveX component used by Internet Explorer. We are releasing this blog to confirm one more time that the code execution vulnerability will be fixed in today’s UpdateTuesday release and to clarify some details about the second vulnerability reported.

Late last Friday, November 8, 2013, a vulnerability, CVE-2013-3918, affecting an Internet Explorer ActiveX Control was publically disclosed. We have confirmed that this vulnerability is an issue already scheduled to be addressed in “Bulletin 3”, which will be released as MS13-090, as listed in the November Advanced Notification Service (ANS). The security update will be distributed to customers tomorrow via Windows Update at approximately 10:00 AM PDT.

Today, we’re providing advance notification for the release of eight bulletins, three Critical and five Important, for November 2013. The Critical updates address vulnerabilities in Internet Explorer and Microsoft Windows, and the Important updates address issues in Windows and Office. While this release won’t include an update for the issue first described in Security Advisory 2896666, we’d like to tell you a bit more about it.

Object lifetime management vulnerabilities represent a very common class of memory safety vulnerability. These vulnerabilities come in many shapes and sizes, and are typically quite difficult to mitigate generically. Vulnerabilities of this type result commonly from incorrect accounting with respect to reference counts describing active users of an object, or improper handling of certain object states or error conditions.

Today we released Security Advisory 2896666 regarding an issue that affects customers using Microsoft Windows Vista and Windows Server 2008, Microsoft Office 2003 through 2010, and all supported versions of Microsoft Lync. We are aware of targeted attacks, largely in the Middle East and South Asia. The current versions of Microsoft Windows and Office are not affected by this issue.

Recently we become aware of a vulnerability of a Microsoft graphics component that is actively exploited in targeted attacks using crafted Word documents sent by email. Today we are releasing Security Advisory 2896666 which includes a proactive Fix it workaround for blocking this attack while we are working on the final update.