CVE-2023-21116 Explained : Impact and Mitigation

This CVE record, assigned by google_android, was published on May 15, 2023. It involves a vulnerability related to downgrading system apps below the system image version on Android devices, potentially leading to local privilege escalation.

Understanding CVE-2023-21116

This section will provide an in-depth understanding of CVE-2023-21116, including what it is, its impact, technical details, and mitigation strategies.

What is CVE-2023-21116?

CVE-2023-21116 specifically pertains to a logic error in the code of InstallPackageHelper.java, specifically in the verifyReplacingVersionCode function. This flaw opens up a vulnerability that allows an attacker to downgrade system apps below the system image version. Exploiting this vulnerability could result in local escalation of privilege on the affected Android devices. Notably, user interaction is not required for the exploitation of this vulnerability.

The Impact of CVE-2023-21116

The impact of CVE-2023-21116 is significant as it enables malicious actors to gain elevated privileges on Android devices, posing a risk to the security and integrity of the affected systems. With the ability to downgrade system apps, attackers could potentially carry out unauthorized actions with elevated system execution privileges.

Technical Details of CVE-2023-21116

In this section, we will delve into the technical aspects of CVE-2023-21116, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in verifyReplacingVersionCode of InstallPackageHelper.java allows attackers to downgrade system apps below the system image version, leading to local privilege escalation on Android devices.

Affected Systems and Versions

The following Android versions are impacted by CVE-2023-21116: Android-11, Android-12, Android-12L, and Android-13.

Exploitation Mechanism

The exploitation of this vulnerability does not require user interaction. By leveraging the logic error, attackers can manipulate the versioning system to achieve privilege escalation.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-21116, it is crucial to take immediate steps and adopt long-term security practices to enhance the overall security posture of Android devices.

Immediate Steps to Take

Monitor security bulletins and updates from Android to stay informed about patches related to this vulnerability.
Implement access controls and restrictions to limit the impact of potential privilege escalation attacks.
Consider restricting app installations from unofficial sources.

Long-Term Security Practices

Regularly update Android devices with the latest security patches and firmware updates to address known vulnerabilities.
Conduct security audits and vulnerability assessments to identify and remediate potential security loopholes.
Educate users about safe browsing habits and the risks associated with unauthorized app installations.

Patching and Updates

Stay informed about security advisories and patches released by Android to address CVE-2023-21116. Apply these patches promptly to prevent exploitation of the vulnerability and enhance the security of Android devices.