CVE-2021-39703 : Security Advisory and Response
Learn about CVE-2021-39703, a vulnerability in Android-12 that allows local escalation of privilege without additional execution privileges. Find mitigation steps and prevention measures.
This CVE article provides details about a vulnerability in Android-12 that could lead to local escalation of privilege without the need for additional execution privileges.
Understanding CVE-2021-39703
CVE-2021-39703 is related to an elevation of privilege vulnerability in Android-12.
What is CVE-2021-39703?
In the updateState of UsbDeviceManager.java in Android-12, there is a possibility of unauthorized access to files, leading to a confused deputy situation. This vulnerability may result in local escalation of privilege without requiring extra execution privileges, and user interaction is unnecessary for exploitation.
The Impact of CVE-2021-39703
The vulnerability could potentially allow an attacker to escalate their privileges on the local system without additional execution privileges.
Technical Details of CVE-2021-39703
This section delves into the technical aspects of the CVE.
Vulnerability Description
The vulnerability in updateState of UsbDeviceManager.java allows unauthorized file access, creating a confused deputy scenario and enabling local privilege escalation.
Affected Systems and Versions
- Product: Android
- Versions Affected: Android-12
Exploitation Mechanism
The exploitation involves unauthorized access to files in the UsbDeviceManager.java file, leading to a confused deputy scenario facilitating local privilege escalation.
Mitigation and Prevention
Mitigation strategies to address the CVE-2021-39703 vulnerability.
Immediate Steps to Take
- Apply security updates from the official Android Security Bulletin.
- Monitor for any unauthorized file access or privilege escalation attempts.
Long-Term Security Practices
- Conduct regular security audits and code reviews to identify and address vulnerabilities.
- Implement the principle of least privilege to restrict access to sensitive files and functions.
Patching and Updates
Regularly update the Android-12 system with the latest security patches to mitigate the risk of unauthorized file access and privilege escalation.