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.
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.
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.
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 has corrected this vulnerability by validating string lengths in RPC calls to the service.
Microsoft has released a security bulletin at the following link: MS09-064
An unauthenticated, remote attacker could exploit this vulnerability to execute arbitrary code with SYSTEM privileges.
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.
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.
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.
The security vulnerability applies to the following combinations of products.
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
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the
Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service.
This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.