CVE-2011-2856 in Chrome
Summary
by MITRE
Google V8, as used in Google Chrome before 14.0.835.163, allows remote attackers to bypass the Same Origin Policy via unspecified vectors.
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Analysis
by VulDB Data Team • 01/11/2025
The vulnerability identified as CVE-2011-2856 represents a critical security flaw in Google V8 JavaScript engine that powers Google Chrome browser functionality. This vulnerability specifically targets the Same Origin Policy implementation, which serves as a fundamental security mechanism in web browsers designed to prevent unauthorized access to resources across different domains. The V8 engine's failure to properly enforce this policy creates a significant attack surface that could be exploited by remote threat actors to circumvent essential web security boundaries. The vulnerability affects Chrome versions prior to 14.0.835.163, indicating that this flaw existed for several years before the patch was released, potentially exposing millions of users to coordinated attacks.
The technical nature of this vulnerability lies in the improper handling of cross-origin resource access within the V8 JavaScript engine's execution environment. When Chrome processes JavaScript code, the V8 engine interprets and executes scripts that may attempt to access resources from different origins. The flaw manifests in the engine's inability to correctly validate or restrict these cross-origin access attempts, allowing malicious code to bypass the browser's security restrictions. This could enable attackers to access sensitive data, cookies, or other resources that should be restricted to the same origin domain. The unspecified vectors suggest that multiple attack paths may exist within the engine's implementation, making the vulnerability particularly concerning as it could be exploited through various JavaScript operations or API calls.
The operational impact of this vulnerability extends far beyond simple privilege escalation, as it fundamentally undermines the browser's security model that web developers and users rely upon for protection. Attackers could exploit this vulnerability to perform cross-site scripting attacks, steal session cookies, access user data from other websites, or manipulate web applications in ways that violate security boundaries. The implications are particularly severe because V8 is used across multiple Google products and web applications, meaning that a successful exploitation could potentially affect numerous services beyond just the Chrome browser itself. This vulnerability could enable sophisticated attacks such as credential theft, data exfiltration, or the execution of malicious code in contexts where it would normally be restricted.
Security mitigations for CVE-2011-2856 primarily focus on updating to patched versions of Google Chrome, specifically versions 14.0.835.163 and later. Organizations should implement comprehensive patch management procedures to ensure all affected systems are updated promptly. Network administrators should monitor for suspicious activities that might indicate exploitation attempts, particularly unusual cross-origin resource requests or JavaScript execution patterns. The vulnerability aligns with CWE-284 access control weaknesses and could be categorized under ATT&CK techniques involving privilege escalation and credential access. Additionally, browser hardening measures such as disabling unnecessary JavaScript features, implementing content security policies, and using security extensions can provide additional defense layers. Security teams should also consider implementing web application firewalls to detect and block malicious JavaScript patterns that might attempt to exploit this vulnerability.