Vulnerability Note VU#820628

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.

I. 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.

II. Impact

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

III. Solution

Update

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

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
Systems Affected

Vendor Status Date Notified Date Updated

Microsoft Corporation Vulnerable 11-Oct-2006

References

http://www.microsoft.com/technet/security/bulletin/ms06-063.mspx

Credit

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

Date Public:	2006-10-10
Date First Published:	2006-10-11
Date Last Updated:	2006-10-11
CERT Advisory:
CVE-ID(s):	CVE-2006-4696
NVD-ID(s):	CVE-2006-4696
US-CERT Technical Alerts:
Metric:	12.66
Document Revision:	6

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Produced 2006 by US-CERT, a government organization
Disclaimers and copyright information

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