CVE-2009-0848 in OpenSUSE
Summary
by MITRE
Untrusted search path vulnerability in GTK2 in OpenSUSE 11.0 and 11.1 allows local users to execute arbitrary code via a Trojan horse GTK module in an unspecified "relative search path."
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Analysis
by VulDB Data Team • 08/05/2021
The vulnerability identified as CVE-2009-0848 represents a critical untrusted search path issue within the GTK2 graphical toolkit implementation on OpenSUSE 11.0 and 11.1 systems. This flaw resides in the GTK2 library's module loading mechanism, where the system fails to properly validate or sanitize the search paths used to locate GTK modules. The vulnerability specifically manifests when the system processes relative paths during module loading, creating an opportunity for malicious actors to place compromised modules in directories that are searched before the legitimate system locations. This behavior directly aligns with CWE-426, which describes the insecure loading of dynamic libraries due to untrusted search paths, making it a classic example of path traversal and privilege escalation through library injection.
The technical exploitation of this vulnerability occurs through a Trojan horse module placement attack where a local user positions a malicious GTK module in a directory that appears earlier in the module search path than the legitimate system directories. When GTK applications attempt to load modules, they inadvertently execute the malicious code contained within the compromised module, thereby gaining execution privileges with the privileges of the application that loaded it. The relative search path aspect means that the system resolves module locations based on the current working directory or other relative paths, which can be manipulated by an attacker to place malicious code in a location that will be loaded before legitimate modules. This vulnerability type falls under the ATT&CK technique T1059.001 for command and scripting interpreter and T1548.002 for abuse of group privileges, as it leverages the trust placed in legitimate system components to achieve unauthorized code execution.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a persistent means of executing code within the context of GUI applications that utilize GTK2. Since many desktop applications rely on GTK2 for their user interfaces, an attacker who successfully places a malicious module could potentially compromise a wide range of applications and potentially gain access to user data, session information, or system resources. The vulnerability is particularly concerning in multi-user environments where local users might not have direct access to system directories but can manipulate relative paths in their working directories. This creates a vector for privilege escalation attacks where users can elevate their privileges to those of the applications they are executing, or even to system-level privileges if the applications run with elevated permissions. The vulnerability's classification under CWE-426 emphasizes its fundamental nature as a design flaw in how dynamic libraries are loaded and resolved within the system's module architecture.
Mitigation strategies for CVE-2009-0848 require both immediate patching and long-term architectural improvements to prevent similar vulnerabilities in future implementations. System administrators should immediately apply security patches provided by OpenSUSE that address the specific module loading behavior and ensure that all GTK2 components are updated to versions that properly validate search paths. The recommended approach includes implementing absolute path resolution for module loading rather than relying on relative paths, and ensuring that system directories are prioritized over user-controlled directories during the module search process. Additionally, implementing proper file permissions and access controls on GTK module directories can prevent unauthorized modification of legitimate modules. Organizations should also consider implementing application whitelisting policies that restrict which modules can be loaded by applications, and conduct regular security audits of system directories to detect any unauthorized module placements. The vulnerability serves as a reminder of the importance of secure coding practices in library loading mechanisms and the need for proper input validation and path resolution in system components.