CVE-2007-4569 in KDE
Summary
by MITRE
backend/session.c in KDM in KDE 3.3.0 through 3.5.7, when autologin is configured and "shutdown with password" is enabled, allows remote attackers to bypass the password requirement and login to arbitrary accounts via unspecified vectors.
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Analysis
by VulDB Data Team • 07/26/2019
The vulnerability identified as CVE-2007-4569 represents a critical authentication bypass flaw within the KDM (KDE Display Manager) component of the KDE desktop environment. This issue affects versions 3.3.0 through 3.5.7 and specifically manifests when two security configurations are simultaneously enabled: autologin functionality and the "shutdown with password" setting. The flaw allows remote attackers to circumvent the intended password protection mechanisms and gain unauthorized access to arbitrary user accounts. The vulnerability exists in the backend/session.c file, which handles session management and authentication processes within the display manager. This represents a fundamental breakdown in the security model where the system fails to properly validate authentication credentials when transitioning between different operational states.
The technical implementation of this vulnerability stems from improper handling of session state transitions within the KDM architecture. When autologin is configured alongside the shutdown password requirement, the system does not adequately verify that the user attempting to access a session has proper authorization. The unspecified vectors that enable this attack suggest that the flaw may involve manipulation of session identifiers, authentication tokens, or state variables that control access permissions. This type of vulnerability falls under the category of improper authentication handling as defined by CWE-287, which addresses situations where systems fail to properly authenticate users or validate their access rights. The attack vector likely exploits weaknesses in the session management logic that should prevent unauthorized access to accounts while maintaining the security controls necessary for shutdown operations.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially compromising entire user environments. Attackers who successfully exploit this flaw can gain access to any account configured within the KDM system, potentially accessing sensitive user data, personal files, and system resources. The implications are particularly severe because the vulnerability operates at the display manager level, which serves as the primary interface between users and the operating system's authentication mechanisms. This allows attackers to bypass not just individual account protections but also the broader security framework that should protect against unauthorized system access. The vulnerability essentially creates a backdoor that undermines the fundamental security assumptions of the KDE desktop environment's authentication model, making it particularly dangerous in multi-user or enterprise environments where proper access controls are essential.
Mitigation strategies for this vulnerability require immediate system updates to patched versions of KDE that address the session management flaw. Organizations should disable autologin functionality when shutdown password protection is enabled, as this combination creates the exploitable condition. The recommended approach involves implementing proper session validation procedures that ensure all access attempts are properly authenticated regardless of the system's operational state. Security administrators should also consider implementing additional monitoring mechanisms to detect unauthorized access attempts and ensure that session management configurations follow security best practices. This vulnerability highlights the importance of proper state management in authentication systems and aligns with ATT&CK technique T1078 which covers valid accounts and legitimate credentials as a means of gaining access to systems. Organizations should conduct thorough security assessments of their display manager configurations and ensure that all authentication mechanisms are properly validated and that security controls are not inadvertently weakened by configuration combinations. The vulnerability demonstrates how seemingly benign configuration options can create security risks when combined inappropriately, emphasizing the need for comprehensive security testing of system integration points.