CVE-2007-0351 in Windows
Summary
by MITRE
Microsoft Windows XP and Windows Server 2003 do not properly handle user logoff, which might allow local users to gain the privileges of a previous system user, possibly related to user profile unload failure. NOTE: it is not clear whether this is an issue in Windows itself, or an interaction with another product. The issue might involve ZoneAlarm not being able to terminate processes when it cannot prompt the user.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 04/07/2017
This vulnerability affects Microsoft Windows XP and Windows Server 2003 operating systems where the user logoff process fails to properly handle user profile unloading. The flaw occurs during the logout sequence when the system does not correctly terminate or release resources associated with the previous user session, potentially allowing local attackers to escalate privileges by accessing the credentials or system resources of the previously logged-in user. This represents a privilege escalation vulnerability that could be exploited by malicious users with local access to the system, as the operating system fails to properly isolate user sessions during the transition from one user to another. The vulnerability is categorized under CWE-284 Access Control, which deals with insufficient access control mechanisms that allow unauthorized users to access system resources or elevate their privileges.
The technical implementation of this flaw involves the failure of the Windows session management subsystem to properly clean up user profile data and process handles during the logoff sequence. When a user logs off from the system, the operating system should unload the user profile and terminate all associated processes that were running under that user context. However, in vulnerable versions of Windows, this cleanup process can fail, leaving behind process handles or profile data that can be accessed by subsequent users who log into the system. This creates a scenario where the system state from one user session can persist and potentially be exploited by another user who has not yet logged in, or by an attacker who has already established a foothold on the system.
The operational impact of this vulnerability is significant for organizations running Windows XP or Windows Server 2003 systems, as it creates a persistent security risk that can be exploited by local attackers to gain unauthorized access to system resources and potentially escalate privileges to higher-level accounts. The vulnerability is particularly concerning in multi-user environments where multiple individuals share the same physical system, as it could allow one user to access another user's session data, files, or applications. The attack vector requires local system access, but once exploited, it can provide an attacker with elevated privileges and access to sensitive information that was previously protected by the operating system's user isolation mechanisms.
The vulnerability may be related to third-party security software interactions, particularly with products like ZoneAlarm that can interfere with normal process termination sequences. This interaction suggests that the issue might not be purely within Windows itself but could involve conflicts with security applications that attempt to monitor or control process execution. The described scenario indicates that ZoneAlarm's inability to properly terminate processes when it cannot prompt the user could be contributing to the profile unload failure, making this a complex issue that involves both the operating system's session management and third-party security applications. Organizations should consider this interaction when implementing security solutions on affected systems.
Mitigation strategies for this vulnerability should include applying the appropriate Microsoft security patches that address the user profile unload handling in Windows XP and Windows Server 2003. System administrators should also review and update third-party security software configurations to ensure compatibility with the operating system's session management processes. Network segmentation and access controls should be implemented to limit local access to affected systems, while regular monitoring should be conducted to detect any unauthorized access attempts. Additionally, organizations should consider implementing user account management policies that minimize the risk of privilege escalation and ensure that users log off completely from systems when not in use. The vulnerability demonstrates the importance of maintaining updated security patches and the potential risks that can arise from interactions between operating system components and third-party security applications. This issue highlights the need for comprehensive testing of security solutions in enterprise environments to prevent unexpected interactions that could create security vulnerabilities.