CVE-2021-39706 Explained : Impact and Mitigation

This CVE-2021-39706 article provides detailed information about a vulnerability in Android versions 10, 11, and 12 that could lead to local privilege escalation.

Understanding CVE-2021-39706

CVE-2021-39706 is a vulnerability in Android versions 10, 11, and 12 that allows for local escalation of privilege without requiring additional execution privileges, with user interaction needed for exploitation.

What is CVE-2021-39706?

In onResume of CredentialStorage.java in Android, a missing permission check enables unauthorized access to credential storage, potentially leading to privilege escalation.

The Impact of CVE-2021-39706

This vulnerability could be exploited locally to escalate privileges on affected devices, posing a security risk to user data and system integrity.

Technical Details of CVE-2021-39706

CVE-2021-39706 involves the following technical aspects:

Vulnerability Description

The vulnerability lies in onResume of CredentialStorage.java, where a missing permission check allows cleanup of credentials storage, enabling privilege escalation.

Affected Systems and Versions

Product: Android
Versions Affected: Android-10, Android-11, Android-12

Exploitation Mechanism

The vulnerability can be exploited by malicious actors through local interaction, without the need for additional execution privileges.

Mitigation and Prevention

Taking steps to mitigate and prevent the exploitation of CVE-2021-39706 is crucial:

Immediate Steps to Take

Implement the latest Android security updates and patches promptly.
Monitor device behavior and permissions closely.

Long-Term Security Practices

Regularly review and enhance permission, authentication, and access controls.
Educate users on safe practices and awareness regarding app permissions.

Patching and Updates

Stay vigilant for security bulletins and updates from Android to address CVE-2021-39706 and other vulnerabilities promptly.