CVE-2012-1945 in Firefox
Summary
by MITRE
Mozilla Firefox 4.x through 12.0, Firefox ESR 10.x before 10.0.5, Thunderbird 5.0 through 12.0, Thunderbird ESR 10.x before 10.0.5, and SeaMonkey before 2.10 allow local users to obtain sensitive information via an HTML document that loads a shortcut (aka .lnk) file for display within an IFRAME element, as demonstrated by a network share implemented by (1) Microsoft Windows or (2) Samba.
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Analysis
by VulDB Data Team • 10/21/2024
This vulnerability represents a critical information disclosure flaw affecting multiple Mozilla products including Firefox, Thunderbird, and SeaMonkey across several version ranges. The vulnerability stems from improper handling of shortcut files within HTML documents, specifically when these files are loaded through iframe elements. Attackers can exploit this by crafting malicious HTML content that references shortcut files from network shares, potentially exposing sensitive system information to local users who access such documents.
The technical mechanism involves the browser's rendering engine failing to properly sanitize or isolate shortcut file references when displayed within iframe contexts. When a web page loads a shortcut file through an iframe, the browser may inadvertently expose file system paths, network share details, or other sensitive metadata that would normally be protected from web content access. This occurs particularly when the shortcut file points to resources on Windows network shares or Samba implementations, where the browser's security model does not adequately separate the web content context from the underlying operating system file access mechanisms.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can potentially enable attackers to map network shares, discover system paths, or gather other sensitive data that could facilitate further attacks. The vulnerability affects not only the targeted browsers but also creates a vector for reconnaissance activities against systems where these browsers are used. Security researchers have classified this under CWE-200, which deals with information exposure, and the attack pattern aligns with techniques described in the ATT&CK framework under credential access and reconnaissance phases.
Mitigation strategies should focus on immediate patching of affected versions, implementing strict content security policies, and configuring browser security settings to prevent automatic loading of external resources through iframe elements. Organizations should also consider network-level restrictions to prevent access to potentially malicious shortcut files and implement monitoring for unusual network share access patterns. The vulnerability highlights the importance of proper sandboxing mechanisms in web browsers and demonstrates how seemingly innocuous file reference handling can create significant security risks when combined with network share access patterns.