CVE-2006-2449 in KDM
Summary
by MITRE
KDE Display Manager (KDM) in KDE 3.2.0 up to 3.5.3 allows local users to read arbitrary files via a symlink attack related to the session type for login.
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Analysis
by VulDB Data Team • 06/22/2025
The vulnerability identified as CVE-2006-2449 affects the KDE Display Manager (KDM) component within KDE desktop environments version 3.2.0 through 3.5.3. This represents a critical security flaw that exploits a weakness in how KDM handles session type specifications during the login process, creating an avenue for local privilege escalation through file system manipulation. The issue specifically targets the session management functionality that determines how user sessions are established and maintained within the KDE graphical environment.
The technical exploitation mechanism involves a symbolic link attack that leverages the way KDM processes session type specifications. When a user attempts to log in, KDM creates temporary files or directories to manage the session state, but due to insufficient validation of symbolic link references, an attacker can manipulate these references to point to arbitrary files on the system. This allows local users to bypass normal file access controls and read sensitive information that should otherwise be restricted. The vulnerability stems from improper handling of file paths and symbolic link resolution within the session management subsystem, creating a path traversal condition that can be exploited by malicious local users.
The operational impact of this vulnerability extends beyond simple information disclosure, as it enables local users to access files that may contain sensitive authentication data, configuration settings, or other privileged information. Attackers can exploit this weakness to gain insights into system configurations, potentially leading to further exploitation opportunities or privilege escalation within the KDE environment. The vulnerability affects all local users on systems running affected KDE versions, making it particularly dangerous in multi-user environments where users may have varying levels of access rights. This weakness can be particularly problematic in enterprise environments where desktop security is paramount.
Mitigation strategies for CVE-2006-2449 involve immediate patching of affected KDE installations to the latest available versions that address the symbolic link handling issue. System administrators should also implement proper file system permissions and access controls to limit what local users can manipulate within the KDM session management directories. The vulnerability aligns with CWE-367, which describes the improper handling of symbolic links, and can be categorized under ATT&CK technique T1068, which involves exploiting local system privileges. Organizations should also consider implementing monitoring for suspicious file access patterns and ensuring that all KDE components are kept up to date with security patches to prevent exploitation of similar weaknesses in the display manager subsystem.