CVE-2012-3974 in Firefox
Summary
by MITRE
Untrusted search path vulnerability in the installer in Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, and Thunderbird ESR 10.x before 10.0.7 on Windows allows local users to gain privileges via a Trojan horse executable file in a root directory.
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Analysis
by VulDB Data Team • 12/31/2024
The vulnerability identified as CVE-2012-3974 represents a critical untrusted search path issue within the installation components of Mozilla Firefox and Thunderbird applications across multiple versions. This flaw exists specifically on Windows operating systems where the installer process fails to properly validate file paths during the installation sequence, creating an exploitable condition that adversaries can leverage for privilege escalation. The vulnerability stems from the installer's improper handling of executable file locations, particularly when files are placed in root directories where the installer may inadvertently execute malicious code alongside legitimate installation components.
This security weakness falls under the category of CWE-428, which describes an untrusted search path vulnerability where the system searches for executables in directories that are not properly validated or secured. The flaw allows local attackers to place malicious executable files in the root directory of the installation drive, which the installer will then execute with elevated privileges during the installation process. This creates a privilege escalation vector where a low-privileged user can potentially execute arbitrary code with system-level permissions, effectively bypassing standard security controls and access restrictions.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass potential system compromise and persistent access. Attackers can exploit this condition by placing a Trojan horse executable with the same name as a legitimate installer component in the root directory, causing the installer to execute the malicious file instead of the intended legitimate component. This behavior aligns with ATT&CK technique T1068, which covers privilege escalation through local exploit techniques, and specifically demonstrates how installer-based vulnerabilities can be leveraged for system compromise. The vulnerability affects not only the targeted applications but also creates a broader security risk within the Windows environment where the installer executes.
Mitigation strategies for CVE-2012-3974 require immediate application of vendor security patches and updates to the affected software versions. Organizations should ensure all instances of Firefox and Thunderbird are updated to versions 15.0 or later for Firefox and 10.0.7 or later for Thunderbird ESR, as these releases contain fixes that properly validate installation paths and prevent execution of unauthorized executables. System administrators should implement additional protective measures including restricting write access to installation root directories, implementing proper file integrity monitoring, and conducting regular security audits of installation components. The vulnerability also underscores the importance of secure coding practices and proper input validation in installer components, as highlighted by security frameworks that emphasize the need for robust path validation and privilege separation mechanisms to prevent similar issues in future software development cycles.