CVE-2020-3703 : Security Advisory and Response

A buffer over-read issue in Bluetooth peripheral firmware affecting various Qualcomm Snapdragon products.

Understanding CVE-2020-3703

What is CVE-2020-3703?

The vulnerability involves a buffer over-read issue in Bluetooth peripheral firmware due to a lack of validation for opcode and opcode length.

The Impact of CVE-2020-3703

This vulnerability can potentially lead to security breaches and unauthorized access to devices utilizing the affected Qualcomm Snapdragon products.

Technical Details of CVE-2020-3703

Vulnerability Description

The issue is equivalent to the Link Layer Length Overflow and Silent Length Overflow issues mentioned in the Sweyntooth paper.

Affected Systems and Versions

Products: Snapdragon Auto, Compute, Connectivity, Consumer Electronics Connectivity, Consumer IOT, Industrial IOT, IoT, Mobile, Voice & Music
Versions: APQ8053, APQ8076, AR9344, Bitra, Kamorta, MDM9206, MDM9207C, MDM9607, MSM8905, MSM8917, MSM8937, MSM8940, MSM8953, Nicobar, QCA6174A, QCA9377, QCM2150, QCM6125, QCS404, QCS405, QCS605, QCS610, QM215, Rennell, SC8180X, SDM429, SDM439, SDM450, SDM630, SDM632, SDM636, SDM660, SDM670, SDM710, SDM845, SDX20, SDX24, SM6150, SM7150, SM8150, SXR1130

Exploitation Mechanism

The vulnerability arises from a lack of proper validation for opcode and opcode length in Bluetooth peripheral firmware.

Mitigation and Prevention

Immediate Steps to Take

Apply patches provided by Qualcomm to address the vulnerability.
Monitor Qualcomm's security bulletins for updates and advisories.

Long-Term Security Practices

Regularly update firmware and software to the latest versions.
Implement network segmentation and access controls to limit exposure.

Patching and Updates

Ensure all affected systems are updated with the latest firmware and security patches.