CVE-2012-4009 in Live
Summary
by MITRE
The WebView class in the Cybozu Live application 1.0.4 and earlier for Android allows remote attackers to execute arbitrary JavaScript code, and obtain sensitive information, via a crafted application that places this code into a local file associated with a file: URL.
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Analysis
by VulDB Data Team • 02/20/2019
The vulnerability identified as CVE-2012-4009 resides within the WebView component of the Cybozu Live application version 1.0.4 and earlier for Android platforms. This flaw represents a critical security weakness that enables remote attackers to execute malicious JavaScript code through carefully crafted applications. The vulnerability specifically exploits how the WebView handles file:// URLs and local file associations, creating a pathway for unauthorized code execution and information disclosure. The issue stems from insufficient input validation and sanitization mechanisms within the application's web rendering capabilities, allowing attackers to manipulate the WebView's behavior through malicious file references.
The technical implementation of this vulnerability involves the manipulation of local file paths and URL schemes within the Android WebView component. When the Cybozu Live application processes a file:// URL that references a local file containing malicious JavaScript code, the WebView component fails to properly isolate or sanitize the content before execution. This allows the attacker-controlled JavaScript to run within the application's security context, potentially accessing sensitive user data, system resources, or other application components. The flaw operates under CWE-79 which specifically addresses cross-site scripting vulnerabilities, and more broadly relates to CWE-94 which covers improper control of generation of code. The vulnerability demonstrates a classic case of insufficient input sanitization where the application trusts local file content without proper validation.
The operational impact of CVE-2012-4009 extends beyond simple code execution to encompass comprehensive information disclosure and potential system compromise. Attackers can leverage this vulnerability to access user credentials, personal data, and other sensitive information stored within the application's context. The remote execution capability means that attackers do not need physical access to the device, enabling exploitation through malicious applications or compromised websites that trick users into interacting with the vulnerable Cybozu Live application. This vulnerability affects the principle of least privilege by allowing unauthorized code execution within the application's security boundaries, potentially leading to privilege escalation scenarios. The attack surface is particularly concerning given that WebView components often have access to device resources and user data, making this a significant threat vector in mobile security contexts.
Mitigation strategies for CVE-2012-4009 must address both the immediate vulnerability and broader security practices within the application architecture. The primary remediation involves implementing strict input validation and sanitization for all file:// URL references within the WebView component, ensuring that local file content is properly filtered before execution. Organizations should enforce proper URL scheme handling by implementing Content Security Policy headers and restricting the execution of JavaScript from local file sources. The application should implement proper sandboxing mechanisms to isolate WebView content execution and prevent access to sensitive system resources. Additionally, developers should follow ATT&CK framework tactics related to T1059.007 for command and script interpreter execution, ensuring that JavaScript execution is properly monitored and restricted. Updates to the Cybozu Live application to version 1.0.5 or later are essential, as this vulnerability was addressed through proper input validation and enhanced WebView security configurations that prevent the execution of malicious JavaScript code from local file references.