CVE-2011-2980 in Firefox
Summary
by MITRE
Untrusted search path vulnerability in the ThinkPadSensor::Startup function in Mozilla Firefox before 3.6.20, Thunderbird 3.x before 3.1.12, allows local users to gain privileges by leveraging write access in an unspecified directory to place a Trojan horse DLL that is loaded into the running Firefox process.
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Analysis
by VulDB Data Team • 11/18/2021
The vulnerability identified as CVE-2011-2980 represents a critical untrusted search path issue affecting Mozilla Firefox versions prior to 3.6.20 and Thunderbird 3.x versions before 3.1.12. This flaw resides within the ThinkPadSensor::Startup function, which demonstrates a dangerous reliance on potentially compromised system paths during application initialization. The vulnerability exploits a fundamental security principle where applications fail to properly validate or sanitize the directories from which they load dynamic link libraries, creating an attack surface that malicious actors can leverage to execute arbitrary code with elevated privileges.
The technical implementation of this vulnerability stems from the application's improper handling of dynamic library loading mechanisms during startup processes. When Firefox or Thunderbird initializes, they attempt to load sensor-related DLLs from specific directories without adequate verification of the source or integrity of these components. This untrusted search path behavior allows local attackers with write permissions to a specific directory to place a malicious Trojan horse DLL that will be automatically loaded into the running application process. The flaw specifically manifests in the ThinkPadSensor::Startup function, which is responsible for initializing sensor detection capabilities on ThinkPad laptops, but the improper path resolution affects the entire application execution environment.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise potential. Local users who can write to the targeted directory gain the ability to inject malicious code that executes with the privileges of the running browser process, which typically includes full user-level access to system resources. This creates a significant risk for users who may be running applications with elevated permissions or who are browsing untrusted content. The vulnerability is particularly concerning because it operates at the system level where DLL loading occurs, making it difficult to detect through traditional application-level security measures and potentially bypassing many standard security controls that operate at higher abstraction layers.
Mitigation strategies for this vulnerability require immediate patching of affected applications to version 3.6.20 or later for Firefox and 3.1.12 or later for Thunderbird, as these releases contain the necessary code modifications to address the untrusted search path issue. Additionally, system administrators should implement proper directory permissions to prevent unauthorized write access to application installation directories and related system folders. The vulnerability aligns with CWE-427 Uncontrolled Search Path Element, which specifically addresses the issue of applications not properly sanitizing search paths for dynamic libraries. From an ATT&CK framework perspective, this vulnerability maps to T1068 Valid Accounts and T1546 Persistence, as it enables attackers to establish persistent access through privilege escalation. Organizations should also consider implementing application whitelisting policies and monitoring for suspicious DLL loading activities to detect potential exploitation attempts. The remediation process must include comprehensive testing to ensure that patched versions maintain full functionality while eliminating the security risk associated with untrusted search path resolution.