CVE-2021-39709 : Exploit Details and Defense Strategies

This article provides insights into CVE-2021-39709, a vulnerability in Android-12 that could lead to local privilege escalation.

Understanding CVE-2021-39709

CVE-2021-39709 is a vulnerability in the Android-12 system that allows for a potential permission bypass, leading to an elevation of privilege.

What is CVE-2021-39709?

In the sendSipAccountsRemovedNotification function of SipAccountRegistry.java, an unsafe PendingIntent could be exploited, enabling local privilege escalation without requiring user interaction.

The Impact of CVE-2021-39709

The vulnerability could result in an attacker achieving local escalation of privilege with the need for User execution privileges, posing a security risk to affected devices running Android-12.

Technical Details of CVE-2021-39709

This section delves into the specific technical details of the CVE-2021-39709 vulnerability.

Vulnerability Description

The issue arises from an unsafe PendingIntent in the sendSipAccountsRemovedNotification function of SipAccountRegistry.java, allowing for a potential permission bypass.

Affected Systems and Versions

Product: Android
Version: Android-12

Exploitation Mechanism

The exploitation involves leveraging the unsafe PendingIntent in the sendSipAccountsRemovedNotification function, facilitating the elevation of privilege.

Mitigation and Prevention

Here are some essential steps to mitigate and prevent the exploitation of CVE-2021-39709.

Immediate Steps to Take

Users should apply security patches provided by Android promptly.

Long-Term Security Practices

Regularly update the system and applications to ensure the latest security fixes are in place.

Patching and Updates

Keep the Android-12 operating system up to date with the latest patches to address security vulnerabilities effectively.