CVE-2020-3640 : What You Need to Know

Snapdragon Compute, Snapdragon Consumer IOT, Snapdragon Mobile, Snapdragon Wired Infrastructure and Networking by Qualcomm, Inc. are affected by an issue related to incorrect calculation of buffer size in content protection.

Understanding CVE-2020-3640

What is CVE-2020-3640?

The vulnerability involves resizing the usage table header before passing all the checks, leading to the function exiting with a usage table in an invalid state when a HLOS adversary provides incorrect input.

The Impact of CVE-2020-3640

This vulnerability affects multiple Qualcomm products, potentially allowing adversaries to manipulate the function and compromise the integrity of the usage table.

Technical Details of CVE-2020-3640

Vulnerability Description

The issue arises from incorrect buffer size calculation in content protection, which can be exploited by adversaries to disrupt the function's operation.

Affected Systems and Versions

Products: Snapdragon Compute, Snapdragon Consumer IOT, Snapdragon Mobile, Snapdragon Wired Infrastructure and Networking
Versions: Bitra, Kamorta, QCS404, QCS610, Rennell, Saipan, SC7180, SDX55, SM6150, SM7150, SM8250, SXR2130

Exploitation Mechanism

Adversaries can trigger the vulnerability by providing incorrect input to the function, causing it to exit with the usage table in an invalid state.

Mitigation and Prevention

Immediate Steps to Take

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

Long-Term Security Practices

Regularly update and patch all software and firmware on affected devices.
Implement network segmentation and access controls to limit exposure to potential attacks.

Patching and Updates

Qualcomm has released patches to mitigate the vulnerability; ensure all affected systems are updated with the latest security fixes.