CVE-2021-39733 : Security Advisory and Response

CVE-2021-39733 is a vulnerability in the Android kernel that allows for an out-of-bounds write, leading to a potential escalation of privilege. This article provides insights into the vulnerability and its implications.

Understanding CVE-2021-39733

CVE-2021-39733 is a security vulnerability found in the Android kernel, specifically in the amcs_cdev_unlocked_ioctl function of audiometrics.c. The flaw arises from inadequate input validation, enabling an attacker to execute arbitrary code and elevate privileges without user interaction.

What is CVE-2021-39733?

The vulnerability in amcs_cdev_unlocked_ioctl of audiometrics.c in the Android kernel enables an out-of-bounds write. This can be exploited to locally escalate privileges without the need for user interaction.

The Impact of CVE-2021-39733

The potential consequences of this vulnerability include:

Local escalation of privilege on the affected system
Requirement of system execution privileges for exploitation

Technical Details of CVE-2021-39733

This section delves into the specifics of the CVE, including the affected systems, versions, and exploitation mechanism.

Vulnerability Description

The vulnerability stems from an out-of-bounds write in the amcs_cdev_unlocked_ioctl function of audiometrics.c in the Android kernel, resulting from improper input validation.

Affected Systems and Versions

Product: Android
Versions: Android kernel

Exploitation Mechanism

The vulnerability can be exploited locally to escalate privileges without user interaction, potentially leading to unauthorized access.

Mitigation and Prevention

To address CVE-2021-39733 and enhance system security, consider the following mitigation strategies:

Immediate Steps to Take

Apply security patches promptly
Monitor for any signs of exploitation

Long-Term Security Practices

Implement strong input validation mechanisms
Conduct regular security assessments and audits

Patching and Updates

Stay informed about security updates for the Android kernel, and ensure timely application to protect against known vulnerabilities.