CVE-2021-0920 : What You Need to Know

Android kernel's unix_scm_to_skb function in af_unix.c has a potential use after free vulnerability due to a race condition. This flaw could allow a local attacker to escalate privileges without user interaction, requiring System execution privileges. Google has published security updates addressing this issue.

Understanding CVE-2021-0920

This CVE ID pertains to a privilege escalation vulnerability in the Android kernel caused by a race condition in the unix_scm_to_skb function of af_unix.c.

What is CVE-2021-0920?

The CVE-2021-0920 vulnerability is an elevation of privilege issue in the Android kernel, which, if exploited, could lead to a local attacker gaining escalated privileges without the need for user interaction.

The Impact of CVE-2021-0920

The impact of this vulnerability is the potential escalation of privileges on the affected Android systems, which could be exploited by a local attacker to execute arbitrary code with elevated permissions.

Technical Details of CVE-2021-0920

This section covers specific technical details related to the CVE-2021-0920 vulnerability.

Vulnerability Description

The vulnerability stems from a use after free bug caused by a race condition in the unix_scm_to_skb function of af_unix.c in the Android kernel.

Affected Systems and Versions

The affected product is Android, specifically the Android kernel version. Users of Android devices are advised to apply the necessary security patches promptly.

Exploitation Mechanism

Exploiting this vulnerability requires local access to the target system. By crafting a specific exploit payload, an attacker could potentially leverage this flaw to gain elevated privileges.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-0920, users and administrators should take immediate steps to secure their systems.

Immediate Steps to Take

It is recommended to apply the security updates released by Google for the affected Android kernel version. Regularly check for and apply security patches to stay protected from known vulnerabilities.

Long-Term Security Practices

Practicing good security hygiene, such as limiting network exposure and following the principle of least privilege, can help prevent unauthorized access and privilege escalation attacks.

Patching and Updates

Stay informed about security bulletins and updates from reputable sources like Google. Regularly update your Android devices to ensure that known vulnerabilities are patched in a timely manner.