Vulnerability: MS10-006 - Vulnerabilities in SMB Client Could Allow Remote Code Execution (978251)

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	Details
Vulnerability name/brief description	MS10-006 - Vulnerabilities in SMB Client Could Allow Remote Code Execution (978251)
CVE/CAN name	CVE-2010-0016 CVE-2010-0017
Vendor threat level	Critical
SophosLabs threat level	Medium
Solution	MS10-006
Vendor description	This security update resolves two privately reported vulnerabilities in Microsoft Windows. The vulnerabilities could allow remote code execution if an attacker sent a specially crafted SMB response to a client-initiated SMB request. To exploit these vulnerabilities, an attacker must convince the user to initiate an SMB connection to a malicious SMB server.
SophosLabs comments	This is a dangerous security flaw that has the potential for, at worst, remote code execution yet is potentially quite difficult to execute due to the actions required by the victim. A more likely attack vector is that of a man-in-the middle attack that intercepts legitimate SMB connections and returns a malicious response. However this would require local access to the victims network. SophosLabs have rated this vulnerability a medium level threat.
SophosLabs testing result	N/A
Currently known exploits	At the time of writing SophosLabs have not observed any malware attempting to exploit this vulnerability. Should this situation change samples will be analyzed and we will take action as necessary.
First sample seen	N/A
Discovery date	9 February 2010
Affected software	Microsoft Windows 2000 Service Pack 4 Windows XP Service Pack 2 Windows XP Service Pack 3 Windows XP Professional x64 Edition Service Pack 2 Windows Server 2003 Service Pack 2 Windows Server 2003 x64 Edition Service Pack 2 Windows Server 2003 with SP2 for Itanium-based Systems Windows Vista Windows Vista Service Pack 1 Windows Vista Service Pack 2 Windows Vista x64 Edition Windows Vista x64 Edition Service Pack 1 Windows Vista x64 Edition Service Pack 2 Windows Server 2008 for 32-bit Systems* Windows Server 2008 for 32-bit Systems Service Pack 2* Windows Server 2008 for x64-based Systems* Windows Server 2008 for x64-based Systems Service Pack 2* Windows Server 2008 for Itanium-based Systems Windows Server 2008 for Itanium-based Systems Service Pack 2 Windows 7 for 32-bit Systems Windows 7 for x64-based Systems Windows Server 2008 R2 for x64-based Systems* Windows Server 2008 R2 for Itanium-based Systems *Server Core installation affected.
References	http://www.microsoft.com/technet/security/bulletin/MS10-006.mspx http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0016 http://cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2010-0017
Credits	MAPP
Revisions	9 February 2010 - Initial analysis written

Explanation of terms

Vulnerability Name/Brief Description:
Vendor identifier plus a brief description of the type of attack.

CVE/CAN Name:
Currently assigned CVE name. If a CVE name doesn't exist the CAN name will be used until a CVE has been assigned.

Vendor Threat Level:
Threat level assigned by the vendor

SophosLabs Threat Level:
Threat level assigned by SophosLabs

• LOW RISK - There is little chance of this vulnerability being actively exploited by malware.
• MEDIUM RISK - There is a possibility of this vulnerability being actively exploited by malware.
• HIGH RISK - There is a strong possibility of this vulnerability being actively exploited by malware.
• CRITICAL RISK - This vulnerability will almost certainly be actively exploited by malware.

Solution:
Vendor-supplied Patch identifier and recommended solution, or workaround if applicable.

Vendor Description:
Summary of the cause and potential effect of the vulnerability provided by the vendor.

SophosLabs Comments:
SophosLabs' opinions and observations of the vulnerability in question.

SophosLabs Testing Result:
Details of completed lab testing, if applicable. Please note that the lab test environment may differ significantly from user environments.

Currently Known Exploits:
List of identities for known exploits, if applicable.

First Sample Seen:
Date of the first sample seen by SophosLabs.

Discovery Date:
Date of the earliest known publically disclosed advisory.

Affected Software:
Vulnerable platforms and software versions.