CVE-2023-21091 Explained : Impact and Mitigation

This CVE record, assigned by google_android, highlights a vulnerability in the Android operating system that could potentially lead to a local denial of service attack across user boundaries.

Understanding CVE-2023-21091

This section will delve into what CVE-2023-21091 entails, its impact, technical details, and mitigation strategies.

What is CVE-2023-21091?

CVE-2023-21091 is a vulnerability found in the canDisplayLocalUi function of AppLocalePickerActivity.java within the Android operating system. It arises from a missing permission check, offering a potential pathway for malicious actors to alter system app locales. The exploit could result in local denial of service attacks without requiring additional execution privileges or user interaction.

The Impact of CVE-2023-21091

The impact of this vulnerability is significant as it opens doors for attackers to disrupt normal system functionality and potentially cause harm or inconvenience to users by manipulating app locales and triggering denial of service incidents.

Technical Details of CVE-2023-21091

Let's explore the technical aspects of CVE-2023-21091 including its vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in canDisplayLocalUi of AppLocalePickerActivity.java allows for unauthorized changes to system app locales, enabling attackers to initiate denial of service attacks across user boundaries.

Affected Systems and Versions

The impacted system in this case is Android, specifically version Android-13. Users operating on Android-13 are susceptible to exploitation of this vulnerability.

Exploitation Mechanism

The exploitation of CVE-2023-21091 is facilitated through the lack of a permission check in the canDisplayLocalUi function, creating an avenue for threat actors to modify app locales and execute denial of service attacks.

Mitigation and Prevention

In order to protect systems and users from the risks associated with CVE-2023-21091, it is crucial to understand and implement appropriate mitigation measures.

Immediate Steps to Take

Immediate actions should include monitoring for any suspicious activity related to locale changes and implementing permissions checks to prevent unauthorized modifications. Users should also stay informed about security updates and patches released by the Android security team.

Long-Term Security Practices

Long-term security practices such as regular security audits, code reviews, and comprehensive testing can help identify and address vulnerabilities like CVE-2023-21091 before they are exploited.

Patching and Updates

It is imperative for users to stay vigilant and promptly apply security patches and updates provided by Android to mitigate the risks associated with CVE-2023-21091. Regularly updating the operating system can help close off known vulnerabilities and enhance overall system security.