CVE-2021-21573 : Security Advisory and Response

A buffer overflow vulnerability was identified in the Dell BIOSConnect feature. This CVE allows an authenticated malicious admin user to execute arbitrary code and bypass UEFI restrictions.

Understanding CVE-2021-21573

This section will provide insights into the impact, technical details, and mitigation strategies related to CVE-2021-21573.

What is CVE-2021-21573?

The CVE-2021-21573 is a stack-based buffer overflow vulnerability found in the Dell BIOSConnect feature. It enables an authenticated malicious admin user with local access to the system to potentially run arbitrary code and surpass UEFI restrictions.

The Impact of CVE-2021-21573

The severity of CVE-2021-21573 is rated as HIGH with a CVSS base score of 7.2. The vulnerability's attack complexity is considered HIGH, requiring user interaction but no specialized privileges. The exploit could result in a significant impact on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2021-21573

Let's delve deeper into the vulnerability description, affected systems, versions, and exploitation mechanism.

Vulnerability Description

CVE-2021-21573 is classified under CWE-121 and is identified as a stack-based buffer overflow vulnerability within Dell's BIOSConnect feature. This flaw permits an attacker to execute arbitrary code with elevated privileges.

Affected Systems and Versions

The Dell BIOSConnect feature in versions equal to or earlier than Gen 11 and Gen 10 is impacted by CVE-2021-21573. Systems running these versions may be susceptible to exploitation.

Exploitation Mechanism

An authenticated malicious admin user with local system access can exploit this vulnerability by overrunning the buffer in the BIOSConnect feature. This allows the attacker to manipulate the system, execute malicious code, and potentially bypass UEFI restrictions.

Mitigation and Prevention

Discover how to address CVE-2021-21573 through immediate actions and long-term security practices.

Immediate Steps to Take

It is crucial to take immediate measures to secure the affected systems. Updating to a patched version and monitoring system activity can help mitigate the risk associated with CVE-2021-21573.

Long-Term Security Practices

Implementing robust security protocols, regularly patching systems, restricting user privileges, and monitoring for suspicious activities are vital long-term practices to enhance overall cybersecurity posture.

Patching and Updates

Dell has released patches and security updates to address the vulnerability. Ensuring all systems are up to date with the latest firmware and software versions is essential in preventing exploitation of CVE-2021-21573.