CVE-2021-39714 : Exploit Details and Defense Strategies

This CVE-2021-39714 article provides detailed information about a vulnerability in Android that could lead to local privilege escalation without requiring user interaction.

Understanding CVE-2021-39714

This section will explain what the CVE-2021-39714 vulnerability entails, its impact, and the technical details involved.

What is CVE-2021-39714?

In ion_buffer_kmap_get of ion.c, an integer overflow vulnerability exists, potentially leading to a use-after-free scenario. This flaw can allow for local escalation of privilege without needing additional execution privileges, with no user interaction required for exploitation.

The Impact of CVE-2021-39714

The vulnerability in Android's ion_buffer_kmap_get function can be exploited to achieve local privilege escalation on affected systems.

Technical Details of CVE-2021-39714

In this section, we will delve into the specific technical aspects of the CVE-2021-39714 vulnerability.

Vulnerability Description

The vulnerability involves an integer overflow leading to a use-after-free scenario in ion_buffer_kmap_get of ion.c within the Android kernel.

Affected Systems and Versions

Product: Android
Versions: Android kernel

Exploitation Mechanism

The exploitation of the CVE-2021-39714 vulnerability requires malicious actors to trigger the integer overflow condition in ion_buffer_kmap_get, enabling them to perform a use-after-free attack for local privilege escalation.

Mitigation and Prevention

In this section, we will discuss the steps to mitigate and prevent exploitation of CVE-2021-39714.

Immediate Steps to Take

Update the affected Android systems to the patched versions that address the vulnerability.
Monitor for any suspicious activities that may indicate exploitation attempts.

Long-Term Security Practices

Implement regular security updates and patches for the Android kernel.
Consider implementing least privilege access controls to limit the impact of potential privilege escalation attacks.

Patching and Updates

Apply the necessary patches provided by Android to fix the ion_buffer_kmap_get vulnerability and prevent potential local privilege escalation.