CVE-2021-0556 Explained : Impact and Mitigation

Android 11 has been found to have a vulnerability, tracked as CVE-2021-0556, that could result in local information disclosure without requiring additional privileges. The issue stems from an out-of-bounds read in the getBlockSum function of fastcodemb.cpp.

Understanding CVE-2021-0556

This section delves into the nature and impact of CVE-2021-0556.

What is CVE-2021-0556?

The vulnerability in the getBlockSum function of fastcodemb.cpp in Android 11 allows for a heap buffer overflow, potentially leading to unauthorized access to local information. No user interaction is necessary for an attacker to exploit this flaw.

The Impact of CVE-2021-0556

Exploitation of this vulnerability could enable threat actors to gather sensitive data stored on the affected device without requiring any special user permissions.

Technical Details of CVE-2021-0556

This section explores the specific technical aspects of CVE-2021-0556.

Vulnerability Description

The vulnerability arises from an out-of-bounds read due to a heap buffer overflow in the getBlockSum function of fastcodemb.cpp within Android 11.

Affected Systems and Versions

The affected product is Android, specifically version 11.

Exploitation Mechanism

No user interaction is necessary for the exploitation of this vulnerability, which could result in local information disclosure.

Mitigation and Prevention

This section provides guidance on addressing and preventing the CVE-2021-0556 vulnerability.

Immediate Steps to Take

To mitigate the risk posed by CVE-2021-0556, users are advised to apply relevant security patches and updates promptly.

Long-Term Security Practices

Implementing strong security practices, such as regularly updating software and maintaining a robust cybersecurity posture, can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly check for security bulletins and updates from Android to ensure that your system is protected against known vulnerabilities.