CVE-2021-39633 : Security Advisory and Response

This CVE-2021-39633 article provides insights into a potential information disclosure vulnerability in the Android kernel's gre_handle_offloads function.

Understanding CVE-2021-39633

CVE-2021-39633 is an information disclosure vulnerability in the Android kernel's gre_handle_offloads function.

What is CVE-2021-39633?

The vulnerability arises in gre_handle_offloads of ip_gre.c, leading to a possible page fault due to an invalid memory access.
It could result in local information disclosure without requiring additional execution privileges or user interaction.
The affected product is Android with the specific version being Android kernel.

The Impact of CVE-2021-39633

The vulnerability could allow an attacker to disclose local information without the need for user interaction or additional privileges.

Technical Details of CVE-2021-39633

This section delves into the technical aspects of CVE-2021-39633.

Vulnerability Description

Type: Information disclosure
Description: Invalid memory access in gre_handle_offloads function leading to potential information disclosure.

Affected Systems and Versions

Affected Product: Android
Affected Version: Android kernel

Exploitation Mechanism

The vulnerability can be exploited to cause a page fault due to an invalid memory access, potentially leading to local information disclosure.

Mitigation and Prevention

Discover the steps to mitigate and prevent CVE-2021-39633.

Immediate Steps to Take

Apply patches or updates provided by Android to address the vulnerability.
Monitor security bulletins for relevant information on fixes.

Long-Term Security Practices

Regularly update the Android system to ensure protection against known vulnerabilities.
Implement network security measures to detect and prevent malicious activities.

Patching and Updates

Keep the Android kernel up-to-date with the latest security patches and updates to prevent exploitation of this vulnerability.