CVE-2021-0591 Explained : Impact and Mitigation

Android devices running versions Android-8.1, Android-9, Android-10, and Android-11 are vulnerable to a privilege escalation flaw. By exploiting the sendReplyIntentToReceiver function in BluetoothPermissionActivity.java, attackers can trigger privileged broadcast receivers, leading to local privilege escalation.

Understanding CVE-2021-0591

This CVE affects Android devices and involves the exploitation of a confused deputy vulnerability to elevate privileges.

What is CVE-2021-0591?

The CVE-2021-0591 vulnerability in Android allows attackers to escalate privileges locally with the need for user interaction. The flaw occurs in the sendReplyIntentToReceiver function of BluetoothPermissionActivity.java.

The Impact of CVE-2021-0591

The impact of CVE-2021-0591 is the potential for attackers to exploit privileged broadcast receivers, gaining elevated privileges on Android devices running affected versions.

Technical Details of CVE-2021-0591

The technical details of CVE-2021-0591 include the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability lies in the sendReplyIntentToReceiver function of BluetoothPermissionActivity.java, allowing attackers to invoke privileged broadcast receivers and achieve local privilege escalation.

Affected Systems and Versions

Android devices running versions Android-8.1, Android-9, Android-10, and Android-11 are impacted by CVE-2021-0591.

Exploitation Mechanism

Exploiting this vulnerability requires user interaction to trigger the privileged broadcast receivers, leading to the escalation of local privileges.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-0591, immediate steps to take, long-term security practices, and patching guidance are essential.

Immediate Steps to Take

Security measures should include updating affected Android devices, monitoring for any suspicious activities, and restricting unnecessary user permissions.

Long-Term Security Practices

Implementing security best practices, such as regular security updates, user awareness training, and strong access controls, can enhance the overall security posture.

Patching and Updates

Users and organizations are advised to apply relevant security patches provided by Android to eliminate the CVE-2021-0591 vulnerability and enhance the security of their devices.