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Vulnerability Alert

Microsoft Windows License Logging Service Heap Overflow Vulnerability

 
Threat Type:CWE-119: Buffer Errors
IntelliShield ID:19309
Version:2
First Published:2009 November 10 19:35 GMT
Last Published:2009 November 11 16:13 GMT
Port: 139, 445
CVE:CVE-2009-2523
BugTraq ID:36921
Urgency:Weakness Found
Credibility:Confirmed
Severity:Moderate Damage
CVSS Base:9.3 CVSS Calculator
CVSS Version 2.0
CVSS Temporal:6.9
Related Resources:
View related IPS Signature
 
 
Version Summary:

Additional technical information is available to describe the Microsoft Windows License Logging Service heap overflow vulnerability.? New technical details suggest that a successful exploit may be unlikely.

 
 
Description

Microsoft Windows 2000 contains a vulnerability in the License Logging Service that could allow an unauthenticated, remote attacker to execute arbitrary code.

The vulnerability exists because affected systems do not properly handle malformed RPC requests that are?submitted to the service.? An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with SYSTEM privileges.

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

 
Warning Indicators

Microsoft Windows 2000 systems with SP4 or prior are affected by this vulnerability.? The vulnerability only affects server operating systems; Windows 2000 Professional does not contain the vulnerable service.

The License Logging Service is enabled by default on Windows Server 2000.

 
IntelliShield Analysis

This vulnerability affects systems running the License Logging Service, which is used to manage licenses under a Client Access License (CAL) licensing model.? As a result, it does not run on workstation operating systems.? Further, domains that are not licensed under a CAL model, or servers in?a domain that are not running the service, are not affected.

Microsoft engineers blogging on the Microsoft Security Research and Defense blog have suggested that reliable exploitation of this vulnerability for remote code execution will be difficult to achieve: Details on the License Logging Service Vulnerability

The Cisco Applied Intelligence team has created an Applied Mitigation Bulletin to address vulnerabilities that Microsoft disclosed in the November 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 November 2009

Microsoft has corrected this vulnerability by validating string lengths in RPC calls to the service.

 
Vendor Announcements

Microsoft has released a security bulletin at the following link: MS09-064

 
Impact

An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with SYSTEM privileges.

 
Technical Information

The vulnerability exists because the system incorrectly handles Remote Procedure Calls (RPC) to the llsrv.exe License Logging Service of Microsoft Windows.? Arguments that are supplied to the LlsrLicenseRequestW method are not sufficiently checked for NULL byte termination.?

An unauthenticated, remote attacker could exploit this lack of validation?of?NULL byte termination to concatenate a call to the lstrcatW method within the arguments that are?supplied to the LlsrLicenseRequestW method.? An exploit could?lead to?a heap-based overflow, to allow the attacker?to execute arbitrary code with SYSTEM privileges.

 
Safeguards

Administrators are advised to apply the appropriate updates.

Administrators are advised to disable the License Logging Service on systems that do not require it for maintaining licensing compliance.

Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.

Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.

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
22059/0License Logging Server Heap OverflowS4472009 Nov 10 
22059/1License Logging Server Heap OverflowS6102011 Nov 30 
22059/2License Logging Server Heap OverflowS6892013 Jan 15 
 
Alert History
 

Version 1, November 10, 2009, 2:35 PM: Microsoft Windows 2000 contains a vulnerability that could allow an unauthenticated, remote attacker to execute arbitrary code.? Updates are available.



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

Primary Products:
Microsoft, Inc.Windows 2000 Advanced Server Base, rev.2031, rev.2072, rev.2195, SP1, SP2, SP3, SP4 | Datacenter Server Base, SP1, SP2, SP3, SP4 | Server Base, SP1, SP2, SP3, SP4

Associated Products:
N/A




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