CVE-2021-39668 : Security Advisory and Response
Learn about CVE-2021-39668, a vulnerability in Android 11 and 12 that allows local privilege escalation. Find out the impact, technical details, and mitigation steps here.
CVE-2021-39668 involves a security issue in Android versions 11 and 12 that could lead to an elevation of privilege. Learn about the impact, technical details, and mitigation steps.
Understanding CVE-2021-39668
CVE-2021-39668 is a vulnerability in Android versions 11 and 12 that allows local privilege escalation through a confused deputy attack.
What is CVE-2021-39668?
The vulnerability exists in the onActivityViewReady function of DetailDialog.kt, potentially leading to an Intent Redirect. This redirection could escalate privileges locally, enabling actions as the System UI without additional execution privileges.
The Impact of CVE-2021-39668
The vulnerability could be exploited by a local attacker to gain elevated privileges on the affected Android device, requiring user interaction for exploitation.
Technical Details of CVE-2021-39668
The technical details of CVE-2021-39668 highlight how the vulnerability can be exploited.
Vulnerability Description
In DetailDialog.kt's onActivityViewReady, a confused deputy scenario allows for the redirection of intents, leading to unauthorized actions as the System UI.
Affected Systems and Versions
- Product: Android
- Versions: Android-11, Android-12
Exploitation Mechanism
The exploitation involves triggering the vulnerable code within DetailDialog.kt, leading to unauthorized privilege escalation.
Mitigation and Prevention
Understanding the mitigation steps is crucial to securing affected systems.
Immediate Steps to Take
- Apply the security patch provided by Google for Android versions 11 and 12.
- Monitor for any unauthorized actions on the System UI.
Long-Term Security Practices
- Regularly update Android devices to the latest security patches.
- Follow best practices for app development to prevent similar privilege escalation vulnerabilities.
Patching and Updates
It is essential to promptly apply all recommended security patches and updates for Android devices to mitigate the risks associated with CVE-2021-39668.