CVE-2021-35129 : Exploit Details and Defense Strategies

A memory corruption vulnerability in the Bluetooth (BT) controller of multiple Qualcomm Snapdragon products could allow attackers to execute arbitrary code or cause a denial of service.

Understanding CVE-2021-35129

This CVE impacts various Qualcomm Snapdragon products due to improper length checks in the BT controller firmware.

What is CVE-2021-35129?

The CVE-2021-35129 vulnerability involves memory corruption in the BT controller, arising from inadequate length validation during the processing of vendor-specific commands. This flaw affects a wide range of Snapdragon products.

The Impact of CVE-2021-35129

With a CVSS base score of 7.8, this vulnerability has a high severity rating. Attackers exploiting this issue could compromise the confidentiality, integrity, and availability of affected systems, potentially leading to arbitrary code execution.

Technical Details of CVE-2021-35129

The following technical details further describe the vulnerability:

Vulnerability Description

The vulnerability results from memory corruption due to improper length verification in the BT controller when handling vendor-specific commands.

Affected Systems and Versions

Various Qualcomm Snapdragon products are impacted, including AR8035, IPQ5010, IPQ5028, SD888, and more, across different categories such as Snapdragon Mobile and Snapdragon Wired Infrastructure.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specially crafted vendor-specific commands to the BT controller, triggering memory corruption and potentially executing malicious code.

Mitigation and Prevention

To address CVE-2021-35129, immediate action and long-term security practices are advisable:

Immediate Steps to Take

Apply patches or updates provided by Qualcomm to fix the vulnerability promptly.
Monitor vendor security bulletins for mitigation guidance and instructions.

Long-Term Security Practices

Implement network segmentation and access controls to minimize the impact of potential network intrusions.
Regularly update firmware and software to protect against known vulnerabilities and threats.

Patching and Updates

It is crucial to apply security patches and firmware updates from Qualcomm to remediate the CVE-2021-35129 vulnerability.