CVE-2021-28189 : Exploit Details and Defense Strategies

A Buffer Overflow vulnerability in ASUS BMC's firmware allows remote attackers to terminate the Web service due to a lack of string length verification in the SMTP configuration function.

Understanding CVE-2021-28189

This CVE involves a Buffer Overflow vulnerability in ASUS BMC's firmware that impacts specific versions of the firmware.

What is CVE-2021-28189?

The vulnerability arises from the lack of user input validation in the SMTP configuration function of ASUS BMC's firmware, leading to a Buffer Overflow scenario.

The Impact of CVE-2021-28189

Remote attackers can exploit this flaw to gain privileged access and disrupt the Web service by causing abnormal terminations.

Technical Details of CVE-2021-28189

This section covers the specific technical details related to the CVE.

Vulnerability Description

The vulnerable function in ASUS BMC's firmware allows attackers to overflow the buffer due to unchecked user input, resulting in a high severity vulnerability.

Affected Systems and Versions

Products including BMC firmware for Z10PR-D16, ASMB8-iKVM, and Z10PE-D16 WS are affected, with versions 1.14.51 and 1.14.2 being vulnerable.

Exploitation Mechanism

By manipulating input strings and exploiting the lack of validation, attackers can trigger a Buffer Overflow that grants them unauthorized control over the Web service.

Mitigation and Prevention

To address this vulnerability, users and administrators can follow specific steps to mitigate potential risks.

Immediate Steps to Take

Updating the affected BMC firmware to the recommended versions is crucial to prevent exploitation of this vulnerability.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security audits, and monitoring network traffic can enhance overall system security.

Patching and Updates

Ensure timely installation of vendor-provided patches and updates to eliminate the vulnerability from the affected systems.