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Vulnerability:Win/SMBv2.Command.RCE!CVE-2009-2532

Severity rating
Critical

Class/Type
Vulnerability

Discovered date
2009-10-13T00:00:00

Attack vector
Remote

Authentication required
No

Public exploits available
Yes

Signature detection
Medium



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Description

An unauthenticated remote code execution vulnerability exists in the way that Microsoft Server Message Block (SMB) Protocol software handles specially crafted SMB packets. An attempt to exploit the vulnerability would not require authentication, allowing an attacker to exploit the vulnerability by sending a specially crafted network message to a computer running the Server service. An attacker who successfully exploited this vulnerability could take complete control of the system.



Impact

An attacker who successfully exploited this vulnerability could take complete control of an affected system.



Technical details (analysis)

Server Message Block (SMB) is the file sharing protocol used by default on Windows-based computers. SMB Version 2.0 (SMBv2) is an update to this protocol, and is only supported on computers running Windows Server 2008, Windows 7, and Windows Vista. SMBv2 can only be used if both client and server support it. If either client or server cannot support SMBv2, the SMB 1.0 protocol will be used instead. The SMB protocol version to be used for file operations is decided during the negotiation phase. During the negotiation phase, a Windows Vista client advertises to the server that it can understand the new SMBv2 protocol. This is a remote code execution vulnerability. 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.



Affected software

Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for Itanium-based Systems Service Pack 2



Non-affected software

Microsoft Windows 2000 Service Pack 4
Windows XP Service Pack 2 and Windows XP Service Pack 3.
Windows Server 2003 Service Pack 2.
Windows Server 2003 x64 Edition 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.



References




Solutions




NIS signature

Name: Vulnerability:Win/SMBv2.Command.RCE!CVE-2009-2532
Release Date: 2009-10-13T00:00:00



Known false positives

No known false positives at this time.



Work-arounds

Disable SMB v2.