CVE-2021-0929 : Exploit Details and Defense Strategies

A security vulnerability, identified as CVE-2021-0929, has been discovered in Android's kernel that could potentially lead to an elevation of privilege without requiring any additional execution privileges. This vulnerability, found in ion_dma_buf_end_cpu_access and related functions of ion.c, may allow an attacker to corrupt memory through a use after free scenario.

Understanding CVE-2021-0929

This section provides an overview of the CVE-2021-0929 vulnerability.

What is CVE-2021-0929?

CVE-2021-0929 is a privilege escalation vulnerability present in the Android kernel, specifically impacting ion_dma_buf_end_cpu_access and related functions of ion.c. This vulnerability could enable a malicious actor to manipulate memory and potentially escalate privileges on the affected system.

The Impact of CVE-2021-0929

The exploitation of CVE-2021-0929 could result in a local escalation of privilege, allowing an attacker to gain elevated access rights without the need for additional permissions or user interaction.

Technical Details of CVE-2021-0929

In this section, we delve into the technical aspects of the CVE-2021-0929 vulnerability.

Vulnerability Description

The vulnerability arises from a use after free scenario in ion_dma_buf_end_cpu_access and related functions of ion.c within the Android kernel, potentially leading to memory corruption.

Affected Systems and Versions

The affected product is Android, specifically the Android kernel. The impacted versions have been reported to be vulnerable to this privilege escalation flaw.

Exploitation Mechanism

To exploit this vulnerability, an attacker could potentially corrupt memory through the identified functions, thereby achieving a local escalation of privilege on the target system.

Mitigation and Prevention

Here, we discuss measures to mitigate the risks associated with CVE-2021-0929.

Immediate Steps to Take

Users are advised to apply security patches provided by Android promptly to address the CVE-2021-0929 vulnerability. Additionally, monitoring system logs for any suspicious activities is recommended.

Long-Term Security Practices

Implementing security best practices, such as regular security updates, code reviews, and security testing, can help enhance the overall security posture of the system and mitigate similar vulnerabilities in the future.

Patching and Updates

Staying informed about security bulletins and updates from Android and promptly applying patches to address known vulnerabilities is crucial for maintaining a secure environment.