CVE-2012-2889 in iOS
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Google Chrome before 22.0.1229.79 allows remote attackers to inject arbitrary web script or HTML via vectors involving frames, aka "Universal XSS (UXSS)."
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Analysis
by VulDB Data Team • 04/18/2017
The CVE-2012-2889 vulnerability represents a critical cross-site scripting flaw in Google Chrome browsers prior to version 22.0.1229.79, classified as a Universal XSS (UXSS) vulnerability that exploited frame-based attack vectors to enable remote code execution. This vulnerability emerged from a fundamental flaw in Chrome's security model where the browser failed to properly validate and sanitize frame content, creating a persistent security gap that allowed attackers to inject malicious scripts into web pages through frame manipulation techniques. The vulnerability specifically targeted the browser's handling of frame elements and their associated security contexts, enabling attackers to bypass existing XSS protections by leveraging the complex interaction between nested frames and the browser's rendering engine. The flaw was particularly dangerous because it could be exploited across different security boundaries, making it a universal threat that affected multiple web applications and services.
Technical exploitation of CVE-2012-2889 occurred through carefully crafted frame structures that manipulated the browser's security policies and frame hierarchies. Attackers could create malicious frames that would execute in contexts where normal XSS filters would not apply, effectively bypassing the browser's built-in security mechanisms. The vulnerability exploited a race condition in Chrome's frame processing pipeline where the browser would sometimes fail to properly isolate frame content, allowing malicious scripts to escape their intended frame boundaries and execute in higher privileged contexts. This technical flaw was rooted in the browser's implementation of the same-origin policy enforcement within frame environments, where frame content was not consistently validated against the security context of the parent document. The vulnerability's classification as a CWE-79 (Cross-site Scripting) issue demonstrates its fundamental nature as an input validation flaw, while its universal characteristics align with ATT&CK technique T1059.001 (Command and Scripting Interpreter) through the execution of malicious scripts in web environments.
The operational impact of CVE-2012-2889 was substantial, affecting millions of Chrome users globally who were exposed to persistent XSS attacks that could compromise their browsing sessions and personal data. Attackers could leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of users, redirect them to malicious sites, or inject persistent backdoors into web applications. The vulnerability's exploitation required minimal user interaction beyond visiting a compromised website, making it particularly dangerous for phishing campaigns and targeted attacks. Organizations relying on Chrome-based applications faced significant security risks as the vulnerability could be used to escalate privileges, access sensitive information, or perform unauthorized transactions within web applications. The attack surface was particularly broad due to the widespread use of Chrome and the prevalence of frame-based web applications, creating numerous potential entry points for threat actors. Security professionals noted that the vulnerability's persistence across different web environments made it particularly challenging to defend against, as traditional XSS filters and content security policies were insufficient to prevent the attack.
Mitigation strategies for CVE-2012-2889 focused primarily on immediate browser updates to version 22.0.1229.79 or later, which contained critical patches addressing the frame processing race condition. Organizations were advised to implement comprehensive browser update policies and deploy automated patch management systems to ensure all Chrome installations remained current. Additional defensive measures included implementing strict content security policies, enabling sandboxing features, and deploying web application firewalls to monitor and filter frame-based content. Network administrators were recommended to configure browser security settings to restrict frame loading and implement security headers that would prevent malicious frame injection. The vulnerability highlighted the importance of maintaining current browser versions and implementing layered security approaches, as the flaw demonstrated how seemingly minor implementation details could create significant security risks. Security teams were encouraged to conduct regular vulnerability assessments targeting frame-based web applications and implement monitoring systems to detect suspicious frame behavior, particularly in environments where users interacted with untrusted web content.