CVE-2008-3699 in Amarok
Summary
by MITRE
The MagnatuneBrowser::listDownloadComplete function in magnatunebrowser/magnatunebrowser.cpp in Amarok before 1.4.10 allows local users to overwrite arbitrary files via a symlink attack on the album_info.xml temporary file.
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Analysis
by VulDB Data Team • 08/16/2019
The vulnerability described in CVE-2008-3699 represents a classic file system race condition and symlink attack scenario that affects the Amarok media player software. This issue exists within the MagnatuneBrowser::listDownloadComplete function located in the magnatunebrowser/magnatunebrowser.cpp source file. The vulnerability specifically targets versions of Amarok prior to 1.4.10, indicating this was a known weakness that was subsequently addressed in the software update cycle. The flaw enables local attackers to exploit a temporary file creation process that lacks proper security checks, creating an opportunity for privilege escalation and arbitrary file modification.
The technical implementation of this vulnerability stems from improper handling of temporary files during the download process of album information from the Magnatune music service. When the listDownloadComplete function executes, it creates a temporary file named album_info.xml without sufficient validation or security measures to prevent symbolic link attacks. This temporary file creation process occurs in a location where local users can manipulate the file system structure, allowing them to establish symbolic links that point to sensitive system files or configuration files. The vulnerability manifests because the application does not verify that the temporary file is created with proper permissions and ownership, nor does it validate that the file path does not contain symbolic links that could be exploited by an attacker.
From an operational impact perspective, this vulnerability presents a significant security risk to local users of the Amarok media player. An attacker with local access can leverage this weakness to overwrite critical system files, configuration files, or even files owned by other users or system processes. The attack vector requires local system access but does not require elevated privileges beyond what the user already possesses, making it particularly concerning for environments where multiple users share a single system. The potential for arbitrary file overwrites could lead to system instability, privilege escalation, or even complete system compromise depending on the target files and the user context in which the application runs.
The vulnerability aligns with CWE-367, which describes the Time-of-Check to Time-of-Use (TOCTOU) race condition, and demonstrates a classic example of insecure temporary file handling in software applications. From an ATT&CK framework perspective, this vulnerability maps to T1059 for execution through command-line interfaces and potentially T1548 for privilege escalation. The attack requires minimal skill and can be executed by any local user who has the ability to create symbolic links, making it a particularly dangerous weakness in user-facing applications. The vulnerability also reflects poor security practices in temporary file management, which is a common pattern in applications that fail to implement proper file system access controls and validation mechanisms.
Mitigation strategies for this vulnerability involve several approaches that address the root cause of the issue. The primary solution requires updating to Amarok version 1.4.10 or later, where the developers implemented proper temporary file handling mechanisms that prevent symbolic link attacks. Organizations should also implement proper file system permissions and access controls to limit the ability of local users to manipulate symbolic links in directories where temporary files are created. Additionally, system administrators should consider implementing monitoring solutions to detect suspicious file system activities and symbolic link creation patterns. The fix typically involves using secure temporary file creation methods that ensure atomic file creation with appropriate permissions, preventing the race condition that enables the symlink attack. Security best practices recommend that all applications implementing temporary file creation should follow secure coding guidelines that prevent TOCTOU vulnerabilities and ensure proper file system access controls.