CVE-2004-2091 in Baseline Security Analyzer
Summary
by MITRE
Microsoft Baseline Security Analyzer (MBSA) 1.2 does not correctly identify systems that have been patched but remain vulnerable to exploit until the system is rebooted, possibly giving the administrator a false sense of security.
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Analysis
by VulDB Data Team • 07/05/2017
The Microsoft Baseline Security Analyzer version 1.2 presents a significant security gap in vulnerability assessment capabilities that directly impacts organizational security posture. This tool, designed to help administrators identify missing security updates and configuration issues across Windows systems, fails to properly detect when systems have applied patches but remain vulnerable due to pending reboots. The vulnerability stems from the tool's inability to recognize that certain security updates require system restarts to become fully effective, creating a false positive scenario where systems appear patched and secure when they are actually still vulnerable to exploitation. This limitation specifically affects the MBSA 1.2 version and represents a critical flaw in automated security assessment tools that organizations rely upon for compliance and risk management purposes.
The technical flaw manifests in how MBSA 1.2 evaluates system states during vulnerability scanning operations. When the tool encounters systems that have installed security patches but have not yet rebooted, it incorrectly reports these systems as properly patched and secure. This misidentification occurs because the scanner does not perform a comprehensive check of the actual runtime state of security components, instead relying on static file system or registry-based indicators that may not reflect the true operational status of patched security features. The vulnerability operates at the intersection of system state management and security assessment methodology, where the tool's heuristic approach fails to account for the temporal nature of certain security updates. This issue can be categorized under CWE-200 as it involves improper handling of information that leads to incorrect security assessments and potentially dangerous false confidence levels among administrators.
The operational impact of this vulnerability extends beyond simple misreporting, creating a dangerous false sense of security that can lead to significant security incidents. Administrators who rely on MBSA 1.2 for compliance verification and security monitoring may make incorrect decisions based on the tool's false positive results, potentially leaving vulnerable systems unprotected during critical attack windows. The vulnerability becomes particularly concerning when considering that many security exploits target systems that have recently received patches but have not yet been rebooted, making these systems prime targets for attackers who understand the temporal nature of patch effectiveness. This creates a window of opportunity where organizations believe their systems are secure while they remain vulnerable to exploitation, potentially resulting in data breaches, system compromises, or other security incidents that could have been prevented through accurate vulnerability assessment.
Organizations should implement immediate mitigations to address this vulnerability in their security assessment practices. The most critical approach involves supplementing MBSA 1.2 assessments with manual verification procedures that explicitly check for pending reboots and system state conditions before accepting patch status reports. Security teams should establish protocols that require confirmation of system reboot status for all reported patch installations, particularly for critical security updates that require restarts to become effective. Additionally, organizations should consider implementing more robust security assessment tools that properly handle the temporal aspects of patch management and system state evaluation. The remediation strategy should also include regular security awareness training for administrators to ensure they understand the limitations of automated tools and recognize when manual verification is necessary. From an att&ck framework perspective, this vulnerability maps to tactic TA0007 (Discovery) and technique T1069.001 (Permission Groups Discovery) as it affects the ability to accurately assess system security postures and can lead to missed detection of vulnerable systems that attackers might exploit. Organizations should also consider implementing continuous monitoring solutions that can detect pending reboots and automatically flag systems that require attention, thereby compensating for the limitations of the MBSA 1.2 tool itself.