Microsoft SMBv2 signing vulnerability

Overview

A vulnerability in the way Microsoft Server Message Block Version 2 (SMBv2) implements digital signing of packets may allow a remote, unauthenticated attacker to gain local user privileges and execute arbitrary code.

Description

Microsoft Server Message Block (SMB) Protocol is a network file sharing protocol used by default on Windows based computers. SMBv2 is supported on computers running Windows Server 2008 and Windows Vista. SMBv2 packet signing - used over all SMB communications - is critical for enabling recipients to verify the source and authenticity of the packet. A flaw exists in the way SMBv2 implements packet signing which may allow an attacker to modify a packet in transit, gain local user access to the system and execute arbitrary code.

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Impact

A remote, unauthenticated attacker may be able to execute arbitrary code with local user privileges on an affected system.

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Solution

Microsoft has published Microsoft Security Bulletin MS07-063 in response to this issue. Users are strongly encouraged to review this bulletin and apply the referenced patches.

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In addition to the patches referenced above, Microsoft has published workarounds for this issue. Users who are unable to apply the patches are strongly encouraged to implement these workarounds as appropriate.

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Vendor Information

520465

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Updated: December 12, 2007

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Microsoft has published Microsoft Security Bulletin MS07-063 in response to this issue.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23520465 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.microsoft.com/technet/security/bulletin/ms07-063.mspx&gt;
• <http://secunia.com/advisories/27997/&gt;

Acknowledgements

This vulnerability was reported by the vendor.

This document was written by Joseph W. Pruszynski.

Other Information

CVE IDs:	CVE-2007-5351
Severity Metric:	9.05 Date Public: