CVE-2008-4959 in gpsdrive-scripts
Summary
by MITRE
geo-code in gpsdrive-scripts 2.10~pre4 allows local users to overwrite arbitrary files via a symlink attack on (1) /tmp/geo.google, (2) /tmp/geo.yahoo, (3) /tmp/geo.coords, and (4) /tmp/geo#####.coords temporary files.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 08/26/2019
The vulnerability described in CVE-2008-4959 represents a classic symlink attack scenario within the gpsdrive-scripts 2.10~pre4 software suite. This issue arises from improper handling of temporary files during geocoding operations, specifically affecting the geo-code functionality that processes location data from various sources including google, yahoo, and coordinate-based inputs. The flaw enables local attackers to manipulate the system by creating symbolic links that redirect the geo-code script to overwrite arbitrary files on the system, rather than writing to the intended temporary locations.
The technical implementation of this vulnerability stems from the insecure creation of temporary files without proper validation or atomic operations. When gpsdrive-scripts executes geocoding operations, it creates temporary files in the /tmp directory with predictable names such as geo.google, geo.yahoo, geo.coords, and geo#####.coords. The vulnerability occurs because the application does not verify whether these temporary files already exist or are symbolic links before writing to them. This behavior creates a window of opportunity where a local attacker can establish malicious symbolic links with the same names in the /tmp directory, causing the geo-code script to write data to locations controlled by the attacker rather than the intended temporary files.
From an operational perspective, this vulnerability presents a significant risk to systems running gpsdrive-scripts, particularly in multi-user environments where local privilege escalation could occur. The attack requires local access to the system but does not necessitate network connectivity or specialized privileges beyond basic user accounts. The impact extends beyond simple file overwriting, as attackers could potentially overwrite critical system files, configuration data, or even executable components that might be loaded by the application. This vulnerability aligns with CWE-377: Insecure Temporary File and CWE-378: Creation of Temporary File With Insecure Permissions, both of which are categorized under insecure handling of temporary resources in software applications.
The attack vector can be exploited through various methods including privilege escalation scenarios where a local user might gain access to system files, or through malicious file replacement that could lead to code execution if the overwritten files are subsequently executed by the system. The vulnerability also demonstrates weaknesses in the application's security design, particularly regarding the lack of proper file permission checks and atomic file creation mechanisms. This issue is particularly concerning in environments where gpsdrive-scripts might be used with elevated privileges or where temporary files might be processed by other system components.
Mitigation strategies should focus on implementing secure temporary file handling practices that align with industry standards and best practices. The most effective approach involves using atomic file creation methods that ensure files are created with exclusive access permissions and proper ownership. Systems administrators should implement proper file permissions and utilize secure temporary file creation functions that prevent symlink attacks. Additionally, the application should be updated to use non-predictable temporary file names or implement proper validation of temporary file existence before writing. The vulnerability also highlights the importance of regular security audits and proper input validation in software development processes, particularly for applications that handle sensitive geolocation data. Organizations should consider implementing monitoring for suspicious temporary file creation patterns and ensure that all software components undergo proper security testing including static code analysis and dynamic vulnerability scanning to identify similar issues in other applications.