CVE-2012-6636 in Reflection
Summary
by MITRE
The Android API before 17 does not properly restrict the WebView.addJavascriptInterface method, which allows remote attackers to execute arbitrary methods of Java objects by using the Java Reflection API within crafted JavaScript code that is loaded into the WebView component in an application targeted to API level 16 or earlier, a related issue to CVE-2013-4710.
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Analysis
by VulDB Data Team • 04/12/2025
The vulnerability described in CVE-2012-6636 represents a critical security flaw in Android's WebView component affecting versions prior to API level 17. This issue stems from insufficient restrictions within the WebView.addJavascriptInterface method, creating a dangerous attack vector that allows remote adversaries to execute arbitrary Java methods through malicious JavaScript code. The flaw specifically impacts applications designed for API levels 16 and earlier, making it particularly relevant to legacy Android applications that have not been updated to newer security standards.
The technical implementation of this vulnerability leverages Java Reflection API capabilities within JavaScript code executed inside the WebView component. When an Android application registers Java objects with the WebView using addJavascriptInterface, the system should enforce strict security boundaries between JavaScript execution context and native Java methods. However, the vulnerability allows attackers to bypass these security checks and directly invoke Java methods through reflection, effectively creating a bridge between the sandboxed JavaScript environment and the underlying Java application. This mechanism enables attackers to access sensitive Java objects and execute their methods remotely, potentially leading to complete system compromise.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it can enable attackers to perform sophisticated attacks such as data exfiltration, privilege escalation, and system manipulation. Attackers can exploit this flaw to access sensitive application data, execute unauthorized operations, and potentially gain administrative privileges on affected devices. The vulnerability is particularly dangerous because it operates at the application level rather than requiring device-level privileges, making it accessible to attackers who can only interact with the application through standard network channels. This characteristic aligns with ATT&CK technique T1059.007 for JavaScript and T1068 for exploit for privilege escalation, while also mapping to CWE-787 for out-of-bounds write vulnerabilities in the context of reflection-based attacks.
The vulnerability's relationship to CVE-2013-4710 demonstrates a pattern of similar weaknesses in Android's WebView security model, indicating that developers and security teams should consider broader architectural issues when implementing web-based components in mobile applications. Organizations should implement comprehensive security measures including regular security audits, proper input validation, and strict access controls for any Java objects exposed to JavaScript contexts. The recommended mitigations include upgrading to Android API level 17 or higher where the vulnerability is addressed, implementing proper sandboxing measures, and ensuring that no sensitive Java objects are exposed through addJavascriptInterface without proper security controls. Additionally, developers should adopt defensive programming practices such as using custom interfaces with restricted method exposure and implementing additional validation layers to prevent unauthorized access to native Java functionality through JavaScript execution environments.