CVE-2021-39711 Explained : Impact and Mitigation

This article provides details about CVE-2021-39711, including its description, impact, technical details, and mitigation strategies.

Understanding CVE-2021-39711

CVE-2021-39711 is related to an out-of-bounds read vulnerability in the bpf_prog_test_run_skb function in test_run.c, affecting Android kernels.

What is CVE-2021-39711?

The vulnerability in CVE-2021-39711 can be exploited to achieve local information disclosure, requiring system execution privileges without the need for user interaction.

The Impact of CVE-2021-39711

The vulnerability could potentially lead to local information disclosure on affected Android systems, posing a risk to user data privacy.

Technical Details of CVE-2021-39711

This section covers a detailed analysis of the vulnerability and its implications.

Vulnerability Description

The vulnerability arises from an incorrect size value in the bpf_prog_test_run_skb function, enabling an out-of-bounds read.

Affected Systems and Versions

Product: Android
Versions Affected: Android kernel

Exploitation Mechanism

The exploitation of this vulnerability can result in local information disclosure on Android systems running the affected kernel.

Mitigation and Prevention

To safeguard systems against CVE-2021-39711, follow these security measures.

Immediate Steps to Take

Apply security patches from the upstream kernel to address the vulnerability.
Monitor security bulletins for relevant updates.

Long-Term Security Practices

Conduct regular security assessments to identify and address vulnerabilities.
Implement strict access controls and least privilege principles.

Patching and Updates

Keep systems up to date with the latest security patches and updates to prevent exploitation of known vulnerabilities.