CVE-2023-20929 : Exploit Details and Defense Strategies

This CVE record was assigned by Google Android and was published on March 24, 2023. It pertains to a vulnerability found in Android-13 that could potentially lead to local information disclosure without requiring additional execution privileges.

Understanding CVE-2023-20929

This section will provide an overview of what CVE-2023-20929 entails, its impact, technical details, and mitigation strategies.

What is CVE-2023-20929?

CVE-2023-20929 involves a vulnerability in the sendHalfSheetCancelBroadcast function of HalfSheetActivity.java in Android-13. The issue arises from an unrestricted broadcast intent, which could allow malicious actors to uncover nearby Bluetooth MAC addresses, leading to local information disclosure.

The Impact of CVE-2023-20929

The impact of this vulnerability is significant as it could result in the exposure of sensitive information without the need for user interaction or additional permissions. Attackers exploiting this vulnerability could gather Bluetooth MAC addresses of nearby devices, potentially compromising user privacy.

Technical Details of CVE-2023-20929

To better understand CVE-2023-20929, let's delve into the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability in sendHalfSheetCancelBroadcast function in HalfSheetActivity.java allows for the disclosure of nearby Bluetooth MAC addresses due to an unrestricted broadcast intent, posing a risk of local information exposure.

Affected Systems and Versions

The impacted system in this case is Android-13. Specifically, devices running Android-13 are vulnerable to this exploit as detailed in the Android ID: A-234442700 entry.

Exploitation Mechanism

The exploitation of this vulnerability involves leveraging the unrestricted broadcast intent in the sendHalfSheetCancelBroadcast function to obtain nearby Bluetooth MAC addresses without requiring additional execution privileges.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-20929, immediate steps can be taken along with the adoption of long-term security practices and the application of necessary patches and updates.

Immediate Steps to Take

It is crucial for users to exercise caution while interacting with unknown or untrusted sources, especially in Android-13 environments. Additionally, users should avoid sharing sensitive information over insecure networks to prevent potential information disclosure.

Long-Term Security Practices

Implementing robust security measures such as regularly updating software, utilizing secure network connections, and being cautious of app permissions can help enhance the overall security posture of Android devices and mitigate similar vulnerabilities in the future.

Patching and Updates

Users and organizations are advised to stay informed about security bulletins and updates released by Android to address CVE-2023-20929. Applying patches in a timely manner can help eliminate the identified vulnerability and strengthen the security of affected systems.