CVE-2023-21267 : Vulnerability Insights and Analysis

This CVE-2023-21267 was published by google_android on August 14, 2023, affecting Android versions 13, 12L, 12, and 11. The vulnerability allows bypassing lockdown mode with screen pinning, leading to potential local information disclosure without requiring additional execution privileges or user interaction.

Understanding CVE-2023-21267

This section delves into the details of CVE-2023-21267, covering what the vulnerability entails and its impact.

What is CVE-2023-21267?

The CVE-2023-21267 vulnerability exists in the doKeyguardLocked function of KeyguardViewMediator.java. It presents a flaw that enables the bypassing of lockdown mode with screen pinning, resulting in a potential local information disclosure. Notably, this occurs due to a logic error in the code, allowing exploitation without additional privileges or user interaction.

The Impact of CVE-2023-21267

The impact of this vulnerability lies in the risk of local information disclosure. Malicious entities could exploit this flaw to access sensitive data without the need for user interaction or elevated execution privileges. Such unauthorized access can compromise the confidentiality of information stored on affected devices.

Technical Details of CVE-2023-21267

In this section, we will explore the vulnerability description, affected systems and versions, as well as the exploitation mechanism associated with CVE-2023-21267.

Vulnerability Description

The vulnerability in doKeyguardLocked of KeyguardViewMediator.java allows for the circumvention of lockdown mode using screen pinning. This bypass can potentially lead to the disclosure of local information without the requirement of additional execution privileges or user interaction.

Affected Systems and Versions

CVE-2023-21267 impacts Android versions 13, 12L, 12, and 11, exposing devices running these versions to the risk of information disclosure through the described logic error in KeyguardViewMediator.java.

Exploitation Mechanism

The exploitation of CVE-2023-21267 occurs through leveraging the logic error in doKeyguardLocked, enabling threat actors to bypass lockdown mode with screen pinning. This manipulation can lead to unauthorized access to local information on vulnerable devices.

Mitigation and Prevention

This section outlines key steps to mitigate the risks posed by CVE-2023-21267, focusing on immediate actions and long-term security practices.

Immediate Steps to Take

For immediate protection against CVE-2023-21267, users should be cautious when interacting with untrusted applications or sources. Implementing a cautious approach to device usage can reduce the likelihood of exploitation until a patch is available.

Long-Term Security Practices

Long-term security measures involve staying informed about security updates and patches released by Google for the affected Android versions. Additionally, users should practice good cybersecurity habits, such as avoiding suspicious links and regularly updating their devices to mitigate potential vulnerabilities.

Patching and Updates

To address CVE-2023-21267, affected individuals and organizations are advised to apply security patches provided by Google promptly. Installing the latest software updates can effectively remediate the vulnerability and enhance the overall security posture of impacted devices.