Microsoft Server Service fails to properly handle network messages

Overview

A vulnerability in the way Microsoft Server Service handles network messages may lead to execution of arbitrary code.

Description

Microsoft Server Service provides support for Remote Proceedure Call (RPC), resource sharing, and named pipe communication over the network. Microsoft Server Service may attempt to derefernce an invalid pointer when handling network messages. According to Microsoft Security Bulletin MS06-063:

An attacker could try to exploit the vulnerability by creating a specially crafted message and sending the message to an affected system.
In order to exploit this vulnerability an attacker must be authenticated on the affected network.

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Impact

An authenticated attacker may be able to execute arbitrary code or cause a denial of service condition.

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Solution

Update
Microsoft has released an update to address this issue. See Microsoft Security Bulletin MS06-063 for more details.

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Restrict Access

Block the following ports as discribed by Microsoft Security Bulletin MS06-063:

* UDP ports 135, 137, 138, and 445
* TCP ports 135, 139, 445, and 593   

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Vendor Information

820628

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Microsoft Corporation __ Affected

Updated: October 11, 2006

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

Refer to Microsoft Security Bulletin MS06-063.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23820628 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

<http://www.microsoft.com/technet/security/bulletin/ms06-063.mspx&gt;

Acknowledgements

This vulnerability was reported in Microsoft Security Bulletin MS06-063. Microsoft credits Fortinet and Matthew Amdur of VMWare for reporting this issue.

This document was written by Chris Taschner.

Other Information

CVE IDs:	CVE-2006-4696
Severity Metric:	12.66 Date Public: