CVE-2012-4427 in GNOME
Summary
by MITRE
The gnome-shell plugin 3.4.1 in GNOME allows remote attackers to force the download and installation of arbitrary extensions from extensions.gnome.org via a crafted web page.
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Analysis
by VulDB Data Team • 05/01/2018
The vulnerability identified as CVE-2012-4427 represents a significant security flaw in the GNOME shell extension management system affecting version 3.4.1. This issue resides within the desktop environment's plugin architecture where users are presented with a trusted extension repository at extensions.gnome.org. The flaw manifests when malicious actors craft specially designed web pages that can manipulate the extension installation process, bypassing normal user consent mechanisms and security controls that should prevent arbitrary code execution from untrusted sources.
The technical implementation of this vulnerability stems from insufficient input validation and trust model weaknesses within the GNOME shell's extension handling code. When a user visits a malicious webpage containing crafted javascript or html elements, the system's extension installer can be tricked into automatically downloading and installing extensions without proper user interaction or security verification. This represents a classic case of insufficient validation of user-supplied data and a failure to properly isolate extension installation processes from web content execution environments.
The operational impact of this vulnerability extends beyond simple privilege escalation as it enables persistent malicious presence on affected systems. Attackers can deploy keyloggers, screen capture tools, or other surveillance software through these automatically installed extensions, potentially compromising user data and system integrity. The vulnerability affects desktop environments running GNOME shell 3.4.1, making it particularly concerning for organizations relying on GNOME-based systems for their desktop infrastructure.
From a cybersecurity perspective, this vulnerability aligns with CWE-170, which addresses improper input handling and the potential for malicious input to cause unintended behavior. The attack vector maps to ATT&CK technique T1176, representing the exploitation of a system to install malicious software through trusted application interfaces. Additionally, the vulnerability demonstrates characteristics of privilege escalation through application misuse, though it primarily functions as a persistence mechanism rather than direct privilege elevation.
Mitigation strategies should focus on immediate patching of affected GNOME shell installations to version 3.4.2 or later where this vulnerability has been resolved. Organizations should implement network-level controls to restrict access to the extensions.gnome.org domain when possible, though this may impact legitimate extension updates. Users should be educated about the risks of visiting untrusted websites and the importance of verifying extension sources before installation. System administrators should monitor for unauthorized extension installations through log analysis and implement application whitelisting policies where appropriate. The vulnerability highlights the importance of maintaining up-to-date desktop environments and implementing proper security controls for user-facing applications that handle external content and extension management.