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Vulnerability Alert

Microsoft Windows Workstation Service Privilege Escalation Vulnerability

 
Threat Type:CWE-264: Permissions, Privileges, and Access Control
IntelliShield ID:18773
Version:1
First Published:2009 August 11 18:52 GMT
Last Published:2009 August 11 18:52 GMT
Port: Not available
CVE:CVE-2009-1544
Urgency:Unlikely Use
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:6.8 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:5.0
 
Version Summary:

Microsoft Windows contains a vulnerability that could allow a local attacker to gain escalated privileges or cause a denial of service condition.  Updates are available.

 
 
Description

Microsoft Windows contains a vulnerability that could allow a local attacker to gain escalated privileges or cause a denial of service (DoS) condition.

This vulnerability exists due to errors when handling malformed Remote Procedure Call (RPC) messages.  A local attacker could exploit this vulnerability by sending malicious RPC requests to the vulnerable system.  If successful, the attacker could execute arbitrary code with elevated privileges.

Microsoft has confirmed this vulnerability in a security bulletin and released software updates that correct it.

 
Warning Indicators

The following Microsoft systems are affected:

  • Windows XP SP3 and prior
  • Windows XP Professional x64 Edition SP2 and prior
  • Windows Server 2003 SP2 and prior
  • Windows Server 2003 x64 Edition SP2 and prior
  • Windows Server 2003 Itanium-based Systems with SP2 and prior
  • Windows Vista SP2 and prior
  • Windows Vista x64 Edition SP2 and prior
  • Windows Server 2008 for 32-bit Systems SP2 and prior
  • Windows Server 2008 for x64-based Systems SP2 and prior
  • Windows Server 2008 for Itanium-based Systems SP2 and prior
 
IntelliShield Analysis

An attacker must possess credentials sufficient to log on locally to the system in order to exploit this vulnerability.  The attacker must send malicious RPC requests to the Workstation service in order to accomplish an exploit.  If an exploit is successful, the attacker could execute code resulting in a complete system compromise.  However, because of the technical challenges in developing an exploit, it may be difficult to create exploits for different system platforms.  Additionally, code execution may only be possible on Windows XP and Windows Server 2003 platforms.  An attacker may only be able to accomplish a DoS condition on Windows Vista or Windows Server 2008 systems.

If an attacker holds credentials sufficient for local authentication, the attacker could exploit this vulnerability remotely in some circumstances.  If the system allows remote File and Printer Sharing, an authenticated, remote attacker could exploit the vulnerability over the network.

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the August 2009 security bulletin release.  This Cisco bulletin, which assists administrators in identifying or mitigating these vulnerabilities using Cisco devices, is available at the following link: Cisco Applied Mitigation Bulletin: Microsoft Security Bulletin Release for August 2009

The update available from Microsoft corrects this vulnerability by improving memory allocation.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-041

 
Impact

A local attacker could exploit this vulnerability to execute arbitrary code with elevated privileges, possibly resulting in a complete system compromise.  On some systems, the attacker could trigger a DoS condition.

 
Technical Information

This vulnerability exists due to errors when handling malformed RPC messages.  The processing of a malicious RPC message could cause the affected system to free previously deallocated memory objects, resulting in a double-free error that could trigger memory corruption.  A local attacker could exploit this vulnerability by submitting a malicious RPC request to the vulnerable system.  When processed, the request could trigger a double-free error that could corrupt memory and allow the attacker to execute arbitrary code with the privileges of the Workstation service, typically LocalSystem.

 
Safeguards

Administrators are advised to apply the appropriate software updates.

Administrators are advised to restrict network access to affected systems on TCP ports 139 and 445.

Administrators are advised to restrict system access to trusted users.

Administrators are advised to monitor critical systems.

Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.

 
Patches/Software

Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Windows Update website. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
20220/0Workstation Service Memory Corruption VulnerabilityS4492009 Nov 19 
 
Alert History
 

Initial Release



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
Microsoft, Inc.Windows Server 2003 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit (Itanium) Base, SP1, SP2 | Datacenter Edition x64 (AMD/EM64T) Base, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit (Itanium) Base, SP1, SP2 | Enterprise Edition x64 (AMD/EM64T) Base, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit (Itanium) Base, SP1, SP2 | Standard Edition x64 (AMD/EM64T) Base, SP2 | Web Edition Base, SP1, SP2
Microsoft, Inc.Windows Server 2008 Datacenter Edition Base, SP1, SP2 | Datacenter Edition, 64-bit Base, SP1, SP2 | Itanium-Based Systems Edition Base, SP1, SP2 | Enterprise Edition Base, SP1, SP2 | Enterprise Edition, 64-bit Base, SP1, SP2 | Essential Business Server Standard Base, SP1, SP2 | Essential Business Server Premium Base, SP1, SP2 | Essential Business Server Premium, 64-bit Base, SP1, SP2 | Standard Edition Base, SP1, SP2 | Standard Edition, 64-bit Base, SP1, SP2 | Web Server Base, SP1, SP2 | Web Server, 64-bit Base, SP1, SP2
Microsoft, Inc.Windows Vista Home Basic Base, SP1, SP2 | Home Premium Base, SP1, SP2 | Business Base, SP1, SP2 | Enterprise Base, SP1, SP2 | Ultimate Base, SP1, SP2 | Home Basic x64 Edition Base, SP1, SP2 | Home Premium x64 Edition Base, SP1, SP2 | Business x64 Edition Base, SP1, SP2 | Enterprise x64 Edition Base, SP1, SP2 | Ultimate x64 Edition Base, SP1, SP2
Microsoft, Inc.Windows XP Home Edition Base, SP1, SP2, SP3 | Professional Edition Base, SP1, SP2, SP3 | Professional x64 (AMD/EM64T) Base, SP2

Associated Products:
N/A




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