CVE-2023-20928 : Security Advisory and Response

This CVE record was published on January 24, 2023, by Google Android. It involves a vulnerability in binder_vma_close of binder.c, potentially leading to local escalation of privilege on Android systems.

Understanding CVE-2023-20928

This CVE highlights a specific issue in binder_vma_close within the binder.c file, with the possibility of improper locking leading to a use-after-free scenario. Such a vulnerability could be exploited for local privilege escalation without requiring additional execution privileges.

What is CVE-2023-20928?

CVE-2023-20928 is a security vulnerability found in the Android kernel, specifically in the binder_vma_close function within binder.c. The flaw could allow threat actors to escalate their privileges on affected systems.

The Impact of CVE-2023-20928

The impact of this CVE is significant as it could potentially be leveraged by attackers to elevate their privileges locally on Android devices. Exploitation of this vulnerability could result in unauthorized access to sensitive data or system resources.

Technical Details of CVE-2023-20928

This section delves into the specific technical aspects of the CVE, including vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in binder_vma_close is related to improper locking, leading to a potential use-after-free scenario. Attackers could exploit this flaw to achieve local privilege escalation.

Affected Systems and Versions

The affected product in this CVE is Android, specifically the Android kernel. The specific component at risk is the binder_vma_close function, making systems with this configuration susceptible to the privilege escalation vulnerability.

Exploitation Mechanism

Exploiting this vulnerability requires knowledge of how to manipulate the improper locking within the binder_vma_close function. Attackers could abuse this to gain elevated privileges on the affected Android systems.

Mitigation and Prevention

In order to mitigate the risks associated with CVE-2023-20928, certain immediate steps can be taken along with the implementation of long-term security practices and applying necessary patches and updates.

Immediate Steps to Take

Immediate steps to mitigate the risks of CVE-2023-20928 include monitoring for any suspicious activities, restricting access to critical system resources, and applying security best practices to limit the impact of potential privilege escalation attacks.

Long-Term Security Practices

Implementing long-term security practices such as regular security assessments, threat intelligence sharing, employee training on security protocols, and secure coding practices can help enhance overall security posture against similar vulnerabilities in the future.

Patching and Updates

It is crucial to apply patches and updates provided by the system vendor to address the specific vulnerability in binder_vma_close and prevent potential exploitation. Regularly updating systems helps in staying protected against known security risks.