CVE-2016-1672 in Chrome
Summary
by MITRE
The ModuleSystem::RequireForJsInner function in extensions/renderer/module_system.cc in the extension bindings in Google Chrome before 51.0.2704.63 mishandles properties, which allows remote attackers to conduct bindings-interception attacks and bypass the Same Origin Policy via unspecified vectors.
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Analysis
by VulDB Data Team • 08/22/2022
The vulnerability identified as CVE-2016-1672 resides within the ModuleSystem::RequireForJsInner function in Google Chrome's extension bindings implementation, specifically in the extensions/renderer/module_system.cc file. This flaw represents a critical security issue that affects Chrome versions prior to 51.0.2704.63, where the extension system fails to properly handle JavaScript properties during module loading operations. The vulnerability stems from inadequate validation and processing of module properties, creating a pathway for malicious actors to exploit the extension binding mechanism.
The technical exploitation of this vulnerability occurs through bindings-interception attacks that leverage the improper handling of JavaScript properties within the Chrome extension framework. When Chrome processes extension modules, the ModuleSystem::RequireForJsInner function does not adequately validate or sanitize property access patterns, allowing attackers to manipulate the binding process and intercept extension functionality. This mismanagement creates a scenario where remote attackers can craft malicious extensions or web pages that exploit the flawed property handling to gain unauthorized access to extension resources. The vulnerability specifically targets the Same Origin Policy enforcement mechanism, which is fundamental to web security by preventing scripts from different origins from accessing each other's resources.
The operational impact of CVE-2016-1672 extends beyond simple privilege escalation, as it enables attackers to bypass core web security protections that are essential for maintaining browser isolation. This weakness allows adversaries to execute unauthorized operations across extension boundaries, potentially accessing sensitive data, manipulating extension functionality, or conducting cross-origin attacks that would normally be prevented by Chrome's security model. The vulnerability's classification aligns with CWE-284 Access Control Issues, as it represents a failure in properly controlling access to extension resources and functionality. Additionally, this flaw can be categorized under ATT&CK technique T1059 Command and Scripting Interpreter, where attackers can leverage the compromised extension system to execute malicious code through JavaScript bindings.
Mitigation strategies for CVE-2016-1672 primarily focus on immediate browser updates to versions 51.0.2704.63 and later, where Google has implemented proper property validation and handling mechanisms within the ModuleSystem::RequireForJsInner function. Security administrators should also enforce strict extension review processes, particularly for extensions that require elevated privileges or access to sensitive browser functionality. Organizations can implement additional protective measures such as restricting extension installation permissions, monitoring extension behavior through security tools, and maintaining updated security policies that address extension-based vulnerabilities. The fix implemented by Google addresses the root cause by ensuring proper validation of JavaScript properties during module loading, thereby restoring the intended Same Origin Policy enforcement that prevents unauthorized cross-extension access and maintains the security boundaries between different extension contexts.