CVE-2021-39657 : Vulnerability Insights and Analysis

This CVE-2021-39657 article provides details about an information disclosure vulnerability in Android's kernel that could lead to local information disclosure.

Understanding CVE-2021-39657

This section will cover the critical aspects of the CVE-2021-39657 vulnerability.

What is CVE-2021-39657?

CVE-2021-39657 is an information disclosure vulnerability found in the Android kernel, specifically in ufshcd_eh_device_reset_handler of ufshcd.c. It allows for a potential out-of-bounds read due to a missing bounds check, leading to local information disclosure.

The Impact of CVE-2021-39657

The impact of this vulnerability is the potential for local information disclosure, requiring system execution privileges for exploitation. User interaction is not necessary for the exploit.

Technical Details of CVE-2021-39657

This section delves into the technical details of the CVE-2021-39657 vulnerability.

Vulnerability Description

The vulnerability arises due to a missing bounds check in ufshcd_eh_device_reset_handler of ufshcd.c, enabling an out-of-bounds read.

Affected Systems and Versions

Product: Android
Versions: Android kernel

Exploitation Mechanism

The vulnerability can be exploited locally without the need for user interaction, requiring system execution privileges.

Mitigation and Prevention

Explore the steps to mitigate and prevent exploitation of CVE-2021-39657.

Immediate Steps to Take

Apply security patches promptly to affected systems.
Monitor vendor updates and apply relevant security fixes.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Implement access controls and least privilege principles.

Patching and Updates

Ensure regular monitoring and application of software patches and security updates to prevent exploitation of the vulnerability.