CVE-2021-39779 : Exploit Details and Defense Strategies

This article provides detailed information about CVE-2021-39779, including its impact, technical details, and mitigation steps.

Understanding CVE-2021-39779

CVE-2021-39779 is a vulnerability in Android-12L that could lead to local information disclosure without requiring additional execution privileges.

What is CVE-2021-39779?

In the getCallStateUsingPackage of Telecom Service in Android-12L, a missing permission check may expose call state information locally without needing user interaction for exploitation.

The Impact of CVE-2021-39779

The vulnerability could result in local information disclosure of call state details without requiring extra execution privileges, posing a privacy risk.

Technical Details of CVE-2021-39779

CVE-2021-39779 presents the following technical specifics:

Vulnerability Description

The missing permission check in getCallStateUsingPackage of Telecom Service in Android-12L might allow unauthorized access to call state information.

Affected Systems and Versions

Product: Android
Versions: Android-12L

Exploitation Mechanism

The vulnerability can be exploited to disclose call state information locally without the need for user interaction.

Mitigation and Prevention

Take the following steps to mitigate the impact of CVE-2021-39779:

Immediate Steps to Take

Monitor security bulletins and patches from Android.
Apply relevant security updates promptly.
Restrict app permissions related to call state information.

Long-Term Security Practices

Regularly update the Android OS to the latest version.
Employ security best practices while developing and using applications.

Patching and Updates

Refer to the Android security bulletin for specific patches and updates addressing CVE-2021-39779.