CVE-2021-28186 Explained : Impact and Mitigation

ASUS BMC's firmware experienced a buffer overflow vulnerability due to a lack of string length verification, allowing attackers to execute arbitrary code. Learn about the impact, affected systems, and mitigation steps.

Understanding CVE-2021-28186

This CVE relates to a buffer overflow vulnerability in ASUS BMC firmware, enabling remote attackers to disrupt the Web service.

What is CVE-2021-28186?

The vulnerability in ASUS BMC firmware's Web management page allows malicious actors to trigger a buffer overflow by exploiting a specific function, resulting in unauthorized access.

The Impact of CVE-2021-28186

With a CVSS base score of 4.9 and high availability impact, this vulnerability poses a medium severity risk, potentially leading to service disruption or unauthorized access.

Technical Details of CVE-2021-28186

The following details outline the vulnerability's description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw arises from the firmware's failure to validate user input length properly, leading to a buffer overflow that attackers can leverage for executing arbitrary code.

Affected Systems and Versions

ASUS BMC firmware versions 1.14.51 for Z10PR-D16 and ASMB8-iKVM, as well as version 1.14.2 for Z10PE-D16 WS, are confirmed to be impacted.

Exploitation Mechanism

Remote threat actors can exploit the buffer overflow vulnerability to gain privileged permissions and disrupt Web services.

Mitigation and Prevention

Understanding the necessary steps to address and prevent this vulnerability is crucial for system security.

Immediate Steps to Take

Users should promptly update their ASUS BMC firmware to the recommended versions:

Z10PR-D16 1.16.1
ASMB8-iKVM 1.16.1
Z10PE-D16 WS 1.16.1

Long-Term Security Practices

Implementing regular security updates and patches, conducting security assessments, and monitoring for unusual activities can enhance system protection.

Patching and Updates

Stay informed about firmware updates and security advisories from ASUS to address vulnerabilities promptly.