Assessing the risk of the June security updates

Today we released 16 security bulletins. Nine have a maximum severity rating of Critical and seven have a maximum severity rating of Important. This release addresses several publicly disclosed vulnerabilities. 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…

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MS11-019 and MS11-020: April SMB Updates

This month we released updates for the SMB client and server components (MS11-019 and MS11-020 respectively). These bulletins address three externally-reported issues, but also include fixes for several issues that Microsoft identified internally. This blog post provides background on these issues and the work done internally at Microsoft to improve SMB security. Finding and issuing…

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Notes on exploitability of the recent Windows BROWSER protocol issue

Earlier this week a PoC exploit for a vulnerability in the BROWSER protocol was released on Full Disclosure. There has been some discussion regarding whether this issue can result in Remote Code Execution (RCE) or is only a Denial of Service (DoS). This blog post provides details on the exploitability based on our internal analysis….

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MS10-054: Exploitability Details for the SMB Server Update

This month Microsoft released an update for Windows to address three vulnerabilities in the SMB Server component. Two of the vulnerabilities are remote denial-of-service (DoS) attacks, while one (CVE-2010-2550) has the potential for remote code execution (RCE). This blog post provides more details on the exploitability of CVE-2010-2550, and outlines why the risk of reliable…

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MS10-020: SMB Client Update

Today Microsoft released MS10-020, which addresses several vulnerabilities in the Windows SMB client. This blog post provides additional details to help prioritize installation of the update, and understand the attack vectors and mitigations that apply. Client-side vulnerabilities The first thing to realize is that this update addresses vulnerabilities in the SMB client in Windows. Typically, machines…

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MS10-006 and MS10-012: SMB security bulletins

Today we released two bulletins to address vulnerabilities in SMB. MS10-006 addresses two vulnerabilities in the SMBv1 client implementation, and MS10-012 addresses four vulnerabilities in the SMB server implementation. In this blog entry, we want to help you understand the vulnerabilities and better prioritize the updates. What are the SMB server vulnerabilities and how could…

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MS09-050: Exploit timeline for the SMB2 RCE vulnerability

This month we are releasing update MS09-050 to address the SMBv2 RCE vulnerability (CVE-2009-3103). Due to the fact that public exploit code exists for this vulnerability, we felt it would be good to summarize the exploit landscape at the time of release, so customers can use this information to prioritize the deployment of the update….

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Update on the SMB vulnerability situation

We’d like to give everyone an update on the situation surrounding the new Microsoft Server Message Block Version 2 (SMBv2) vulnerability affecting Windows Vista and Windows Server 2008. Easy way to disable SMBv2 First exploit for code execution released to small number of companies Mitigations that help prevent attacks Status of fixes Easy way to…

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MS09-013 and MS09-014: NTLM Credential Reflection Updates for HTTP clients

This month we are taking another step towards blocking NTLM reflection attacks by releasing MS09-014 for Internet Explorer and MS09-013 for Windows. This is the third update related to NTLM credential reflection we have released, and I thought it would be good to go into a bit more detail on why this update was needed,…

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MS09-001: Prioritizing the deployment of the SMB bulletin

This month we released an update for SMB that addresses three vulnerabilities. This blog post provides additional information that might help prioritize the deployment of this update, and help explain the risk for code execution. In the bulletin you will see that the cumulative severity rating is Critical for Windows 2000, XP and Server 2003…

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