CVE-2023-21108 : Security Advisory and Response

This CVE record pertains to a vulnerability present in Android devices that could potentially lead to remote code execution over Bluetooth without the need for additional execution privileges. The vulnerability specifically exists in the

sdpu_build_uuid_seq

of

sdp_discovery.cc

and is categorized under the problem type of remote code execution.

Understanding CVE-2023-21108

This section delves into an in-depth understanding of the CVE-2023-21108 vulnerability.

What is CVE-2023-21108?

CVE-2023-21108 involves a scenario where an out-of-bounds write is possible due to a use after free issue in the

sdpu_build_uuid_seq

of

sdp_discovery.cc

. This vulnerability has the potential to trigger remote code execution over Bluetooth if HFP (Hands-Free Profile) support is enabled, and this can occur without requiring any additional execution privileges. Notably, user interaction is not a prerequisite for exploitation.

The Impact of CVE-2023-21108

The impact of CVE-2023-21108 is significant as it opens the door for potential remote code execution across Android devices that have the affected versions installed. This could lead to unauthorized access, data theft, or other malicious activities carried out by an attacker leveraging the Bluetooth interface.

Technical Details of CVE-2023-21108

In this section, we will delve into the technical aspects of CVE-2023-21108.

Vulnerability Description

The vulnerability stems from an out of bounds write situation triggered by a use after free condition in the

sdpu_build_uuid_seq

of

sdp_discovery.cc

. This flaw allows threat actors to exploit the system remotely through the Bluetooth interface, especially if HFP support is enabled.

Affected Systems and Versions

The vulnerability impacts various versions of the Android operating system, including Android-11, Android-12, Android-12L, and Android-13. Devices running these versions are susceptible to the remote code execution risk posed by CVE-2023-21108.

Exploitation Mechanism

By taking advantage of the use after free issue in

sdpu_build_uuid_seq

of

sdp_discovery.cc

, threat actors can trigger an out-of-bounds write operation that, when exploited over Bluetooth with enabled HFP support, can result in remote code execution on the affected Android devices.

Mitigation and Prevention

Protecting systems against CVE-2023-21108 requires immediate action and the adoption of robust security practices.

Immediate Steps to Take

Disable HFP support on Android devices to mitigate the risk of exploitation over Bluetooth.
Regularly monitor and apply security patches provided by the Android platform to address the vulnerability.

Long-Term Security Practices

Implement strict access controls and device management policies to prevent unauthorized access to Bluetooth functionalities.
Conduct thorough security audits and vulnerability assessments regularly to identify and remediate potential weaknesses in the system.

Patching and Updates

It is crucial for users and organizations to stay informed about security updates released by the Android platform. Promptly apply patches and updates to ensure that the systems are safeguarded against CVE-2023-21108 and other emerging vulnerabilities.