CVE-2018-5843 : Security Advisory and Response

A vulnerability in the function wma_pdev_div_info_evt_handler() in various Android releases from CAF can lead to a buffer overwrite due to a missing upper bound check.

Understanding CVE-2018-5843

This CVE involves a vulnerability in Qualcomm's Android for MSM, Firefox OS for MSM, and QRD Android that can result in a buffer overwrite.

What is CVE-2018-5843?

The vulnerability arises from the absence of an upper bound check on the value event->num_chains_valid received from firmware, potentially leading to a buffer overwrite of the fixed size chain_rssi_result structure.

The Impact of CVE-2018-5843

The vulnerability can be exploited to execute arbitrary code or crash the system, posing a security risk to affected devices.

Technical Details of CVE-2018-5843

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability is present in the function wma_pdev_div_info_evt_handler() in various Android releases from CAF, affecting Qualcomm's Android for MSM, Firefox OS for MSM, and QRD Android. The issue stems from the lack of an upper bound check on a specific value received from firmware.

Affected Systems and Versions

Product: Android for MSM, Firefox OS for MSM, QRD Android
Vendor: Qualcomm, Inc.
Versions: All Android releases from CAF using the Linux kernel

Exploitation Mechanism

The vulnerability can be exploited by manipulating the value event->num_chains_valid received from firmware, leading to a buffer overwrite of the chain_rssi_result structure.

Mitigation and Prevention

Protecting systems from CVE-2018-5843 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply security patches provided by Qualcomm promptly.
Monitor vendor security bulletins for updates and advisories.

Long-Term Security Practices

Implement network segmentation to contain potential attacks.
Regularly update and patch software to mitigate known vulnerabilities.
Conduct security assessments and penetration testing to identify weaknesses.
Educate users on safe computing practices to prevent exploitation.

Patching and Updates

Regularly check for security updates from Qualcomm and apply them to ensure protection against CVE-2018-5843.