CVE-2011-1813 in Chrome
Summary
by MITRE
Google Chrome before 12.0.742.91 does not properly implement the framework for extensions, which allows remote attackers to cause a denial of service or possibly have unspecified other impact via unknown vectors that lead to a "stale pointer."
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Analysis
by VulDB Data Team • 11/08/2021
The vulnerability identified as CVE-2011-1813 affects Google Chrome versions prior to 12.0.742.91 and stems from improper implementation of the browser's extension framework. This flaw represents a critical security weakness that could be exploited by remote attackers to compromise system stability and potentially execute arbitrary code. The vulnerability specifically manifests through what is termed a "stale pointer" condition, which occurs when the browser attempts to access memory locations that have already been freed or invalidated. Such pointer issues are particularly dangerous in web browsers where extension frameworks handle complex memory management operations and interact with various system components.
The technical implementation flaw lies within Chrome's extension architecture where the browser fails to properly manage memory references when processing extension-related operations. When extensions are loaded or unloaded, the browser's memory management system should properly invalidate all references to extension objects and their associated data structures. However, in vulnerable versions, stale pointers remain accessible in memory, creating opportunities for attackers to manipulate these references and execute malicious code. This type of vulnerability falls under CWE-462, which specifically addresses duplicate object destruction or use of a dangling pointer, and aligns with ATT&CK technique T1059.001 for command and scripting interpreter. The stale pointer condition allows for potential arbitrary code execution or denial of service attacks, making it particularly dangerous in the context of web browsers where extensions can be loaded from untrusted sources.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it could enable remote code execution on affected systems. Attackers could craft malicious extensions or exploit existing extension vulnerabilities to trigger the stale pointer condition, potentially leading to complete system compromise. The attack surface is broad since Chrome extensions can be installed from the Chrome Web Store or loaded as unpacked extensions, making exploitation relatively straightforward for threat actors. Organizations running vulnerable Chrome versions face significant risk as attackers can leverage this vulnerability to gain unauthorized access to user systems, potentially accessing sensitive data or using compromised machines for further malicious activities. The vulnerability's impact is amplified by Chrome's widespread adoption and the typical user behavior of installing extensions from third-party sources.
Mitigation strategies for CVE-2011-1813 primarily involve immediate patching of Chrome installations to version 12.0.742.91 or later, which contains the necessary memory management fixes. System administrators should implement automated update mechanisms to ensure all user browsers remain current with security patches. Additional defensive measures include restricting extension installation permissions, implementing browser extension whitelisting policies, and monitoring for suspicious extension behavior. Organizations should also consider deploying network-based intrusion detection systems to monitor for exploitation attempts targeting this vulnerability. The fix implemented in the patched version addresses the underlying memory management issues by properly invalidating pointers during extension lifecycle events and implementing additional safeguards against dangling pointer access. Regular security assessments of browser extension environments and user education about the risks of installing untrusted extensions remain crucial components of a comprehensive defense strategy against this and similar vulnerabilities.