CVE-2012-0960 in Linux
Summary
by MITRE
Unity integration extension (unity-firefox-extension) before 2.4.1 for Firefox does not properly handle callbacks, which allows remote attackers to cause a denial of service (Firefox crash) and possibly execute arbitrary code via a crafted request.
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Analysis
by VulDB Data Team • 04/19/2021
The vulnerability identified as CVE-2012-0960 affects the Unity integration extension for Firefox, specifically versions prior to 2.4.1. This extension enables seamless integration between Firefox and Ubuntu's Unity desktop environment, providing features such as desktop notifications and system integration. The flaw resides in how the extension processes callback mechanisms within the browser environment, creating a critical security gap that can be exploited by remote attackers through maliciously crafted web requests.
The technical implementation of this vulnerability stems from improper handling of callback functions within the Firefox extension's codebase. When the extension receives certain HTTP requests or web content, it fails to properly validate or sanitize the callback parameters before executing them. This improper input handling creates a condition where attacker-controlled data can influence the extension's execution flow, potentially leading to stack corruption or arbitrary code execution. The flaw represents a classic example of a callback injection vulnerability that can be classified under CWE-94, which deals with the execution of arbitrary code due to improper handling of untrusted data.
The operational impact of this vulnerability is significant as it can result in both denial of service conditions and potential remote code execution. When exploited, the vulnerability causes Firefox to crash and terminate unexpectedly, disrupting user productivity and potentially providing attackers with a means to gain control over the victim's system. The remote nature of the attack means that users can be compromised simply by visiting malicious websites or clicking on crafted links without requiring any additional user interaction. This makes the vulnerability particularly dangerous in phishing campaigns or when deployed in targeted attacks against specific user groups.
Security practitioners should implement immediate mitigations including updating to Unity integration extension version 2.4.1 or later, which contains proper callback validation and sanitization mechanisms. Organizations should also consider implementing browser security policies that restrict the execution of potentially malicious extensions or content. The vulnerability demonstrates the importance of proper input validation in browser extensions and aligns with ATT&CK technique T1059.007 for execution through web shells and T1498 for denial of service attacks. Network administrators should monitor for suspicious traffic patterns and consider implementing web application firewalls to detect and block malicious requests targeting this specific vulnerability. The incident highlights the critical need for thorough security testing of desktop integration components and proper handling of callback mechanisms in cross-platform applications.