CVE-2009-1253 in Tunapie
Summary
by MITRE
James Stone Tunapie 2.1 allows local users to overwrite arbitrary files via a symlink attack on an unspecified temporary file.
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Analysis
by VulDB Data Team • 09/01/2019
The vulnerability identified as CVE-2009-1253 affects James Stone Tunapie version 2.1, a media player application that processes various audio and video formats. This security flaw represents a classic symlink attack scenario that exploits improper handling of temporary files during the application's operation. The vulnerability specifically allows local attackers with access to the system to manipulate the application's behavior by creating symbolic links that point to sensitive system files or directories, enabling unauthorized file overwrites.
The technical implementation of this vulnerability stems from the application's failure to properly validate or sanitize temporary file paths during its execution. When Tunapie 2.1 creates temporary files, it does not adequately verify the existence or integrity of these files before writing data to them. This creates a window of opportunity for attackers who can establish symbolic links with the same names as the temporary files that the application expects to create. The flaw operates under CWE-377 which categorizes insecure temporary file handling, specifically addressing the risk of creating temporary files with predictable names or paths that can be manipulated by attackers.
The operational impact of this vulnerability extends beyond simple file overwrites as it provides attackers with potential persistence mechanisms within the system. Local users who can execute the application can leverage this vulnerability to overwrite critical system files, configuration files, or even files belonging to other users with appropriate privileges. This type of attack can lead to privilege escalation scenarios where attackers gain elevated system access through the manipulation of temporary files that the application creates during normal operation. The attack vector operates through the principle of time-of-check to time-of-use vulnerabilities where the application checks for file existence and then uses the file without revalidating the file's integrity.
This vulnerability aligns with several ATT&CK tactics including privilege escalation and persistence mechanisms. The attack pattern follows the methodology of exploiting weak file permissions and predictable temporary file naming conventions. The flaw demonstrates a fundamental security oversight in the application's design where proper file system access controls and temporary file handling procedures were not implemented. Security researchers have noted that this type of vulnerability is particularly dangerous because it requires minimal privileges to exploit and can be used to establish persistent backdoors or escalate privileges to system-level access.
The recommended mitigation strategies involve implementing proper temporary file handling procedures that include using secure temporary file creation functions, implementing proper file path validation, and ensuring that applications do not create predictable temporary file names. System administrators should also consider implementing file system permissions that prevent unauthorized symbolic link creation and monitor for suspicious file creation patterns. Additionally, the application should be updated to a patched version that properly handles temporary file creation and validation, ensuring that no symbolic links can be used to manipulate the application's file operations. Organizations should also implement regular security assessments to identify similar vulnerabilities in other applications that may be susceptible to the same class of attacks.