CVE-2023-21108: AOSP Bluetooth Use after free-bta_hf_client_sdp.cc-bta_hf_client_do_disc

platform/packages/modules/Bluetooth Updated 02 Oct 2025

Summary

01/06/2023

Disclosed on

CVE-2023-21108

CVE

Yes i

Fix available

Critical

Severity

Not published

CVSS Score

CVE-2023-21108: In sdpu_build_uuid_seq of sdp_discovery.cc, there is a possible out of bounds write due to a use after free. Affects platform/packages/modules/Bluetooth across 2 version ranges.

>= 13:0, < 13:2023-06-01 >= 13-next:0, < 13-next:2023-06-01

Fixed in 13-next:2023-06-01. How to fix ↓

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Background

The AOSP Bluetooth package is a module in the Android ecosystem that provides Bluetooth functionality. It allows devices to connect and communicate wirelessly using the Bluetooth protocol. This vulnerability affects the Bluetooth module's HFP (Hands-Free Profile) support. HFP enables users to make and receive phone calls through a Bluetooth connection. The vulnerability allows for a use after free scenario in the sdpu_build_uuid_seq function of the sdp_discovery.cc file, potentially leading to remote code execution over Bluetooth. Exploitation does not require user interaction.

Vulnerability Detail

The vulnerability originates from a use after free issue in the sdpu_build_uuid_seq function of the sdp_discovery.cc file. This function performs UUID sequence building for the HFP client's SDP (Service Discovery Protocol) records. Due to a use after free, an out-of-bounds write can occur, leading to potential remote code execution over Bluetooth. The vulnerability can be exploited if HFP support is enabled, without requiring additional execution privileges. The impact of this vulnerability is critical as it allows an attacker to execute arbitrary code remotely without user interaction.

How To Fix

Minimum fixed version

13-next:2023-06-01

This is the first release that contains the fix.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The AOSP Bluetooth module is vulnerable to a critical use after free vulnerability that can lead to remote code execution over Bluetooth. It is recommended to apply the provided fix from the AOSP and update to the latest version of the Bluetooth module. Developers should also disable HFP support if not required. For further support on vulnerability remediation, contact DevNack.com.

See every vulnerability recorded for platform/packages/modules/Bluetooth →