CVE-2021-39674 : Exploit Details and Defense Strategies

This CVE-2021-39674 article provides insights into a use after free vulnerability affecting Android versions 10, 11, and 12, potentially leading to local privilege escalation.

Understanding CVE-2021-39674

CVE-2021-39674 is an elevation of privilege vulnerability in Android versions 10, 11, and 12, requiring user execution privileges.

What is CVE-2021-39674?

The vulnerability exists in the btm_sec_connected and btm_sec_disconnected functions of the btm_sec.cc file in Android. Exploitation may allow local privilege escalation without user interaction.

The Impact of CVE-2021-39674

The vulnerability could be exploited for local privilege escalation on Android devices with affected versions.

Technical Details of CVE-2021-39674

This section covers the technical aspects of the vulnerability.

Vulnerability Description

In the btm_sec_connected and btm_sec_disconnected functions of the btm_sec.cc file in Android, a use after free vulnerability exists.

Affected Systems and Versions

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

Exploitation Mechanism

The vulnerability could lead to the exploitation of local escalation of privilege without the need for user interaction.

Mitigation and Prevention

Guidance on mitigating and preventing exploitation of CVE-2021-39674.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Monitor official vendor communications for updates regarding this vulnerability.

Long-Term Security Practices

Regularly update your Android device to the latest available version.
Implement secure coding practices in Android application development.

Patching and Updates

Stay informed about security bulletins and updates from Android to address vulnerabilities like CVE-2021-39674.