CVE-2006-6698 in GConf
Summary
by MITRE
The GConf daemon (gconfd) in GConf 2.14.0 creates temporary files under directories with names based on the username, even when GCONF_GLOBAL_LOCKS is not set, which allows local users to cause a denial of service by creating the directories ahead of time, which prevents other users from using Gnome.
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Analysis
by VulDB Data Team • 06/14/2025
The vulnerability identified as CVE-2006-6698 resides within the GConf daemon implementation in GConf version 2.14.0, representing a significant security flaw that affects the GNOME desktop environment. This issue stems from improper handling of temporary file creation mechanisms within the configuration management system that governs desktop application settings and preferences. The GConf daemon operates as a central configuration system that manages user and system preferences for GNOME applications, making it a critical component of the desktop environment's functionality.
The technical flaw manifests in the daemon's approach to temporary file management where it creates temporary directories using username-based naming conventions without proper verification of directory existence or permissions. This behavior violates fundamental security principles by allowing predictable temporary file creation patterns that can be exploited by malicious local users. When GCONF_GLOBAL_LOCKS is not explicitly enabled, the daemon continues to create these temporary directories with specific naming schemes that correspond to user accounts, creating a race condition vulnerability that can be manipulated by attackers.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables local users to execute a denial of service attack against the entire GNOME desktop environment. An attacker can pre-create directories with the same names that the GConf daemon would normally use for temporary files, effectively blocking legitimate users from accessing the configuration system. This disruption affects all GNOME applications that rely on GConf for their configuration management, rendering the desktop environment unusable for affected users. The attack vector is particularly concerning because it requires minimal privileges and can be executed by any local user, making it an attractive target for system administrators and malicious actors alike.
This vulnerability aligns with CWE-367, which addresses Time-of-Check to Time-of-Use (TOCTOU) race conditions, and represents a classic example of improper temporary file handling in Unix-like systems. The flaw demonstrates poor security design principles where the system fails to implement proper atomic operations or directory permission checks before creating temporary resources. From an ATT&CK framework perspective, this vulnerability maps to T1499.004 which covers network denial of service, though in this case the attack is local rather than network-based. The attack chain involves reconnaissance of the target system's temporary file structure, creation of conflicting directories, and subsequent exploitation of the resulting denial of service condition.
Mitigation strategies for this vulnerability require immediate patching of the GConf daemon to implement proper directory existence checks and atomic creation mechanisms. System administrators should ensure that GConf is updated to versions that address this race condition by implementing proper locking mechanisms or by using more secure temporary file creation methods. Additionally, implementing proper file system permissions and access controls can help limit the impact of such attacks. Organizations should also consider implementing monitoring solutions that can detect unusual directory creation patterns that might indicate exploitation attempts. The vulnerability underscores the importance of secure coding practices in system-level components and highlights the need for thorough security testing of configuration management systems that handle user preferences and application settings.