CVE-2023-28056 Explained : Impact and Mitigation

This CVE record was published on June 23, 2023, by Dell. It involves an improper input validation vulnerability in Dell BIOS that could be exploited by a local authenticated malicious user with administrator privileges to modify a UEFI variable.

Understanding CVE-2023-28056

This section will delve into the details of CVE-2023-28056, outlining the vulnerability, its impacts, technical aspects, and mitigation strategies.

What is CVE-2023-28056?

The vulnerability in question pertains to an improper input validation flaw present in Dell BIOS. This flaw enables a local authenticated malicious user, possessing administrator rights, to potentially manipulate a UEFI variable, leading to unauthorized system changes.

The Impact of CVE-2023-28056

With a CVSSv3.1 base score of 5.1 (Medium severity), this vulnerability poses a threat to system integrity. Although the attack complexity is low and the potential attack vector is local, the impact on integrity is high. Exploitation could allow an attacker to make unauthorized modifications to the UEFI variable, compromising system integrity.

Technical Details of CVE-2023-28056

This section provides a deeper dive into the technical aspects of CVE-2023-28056, detailing the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability stems from improper input validation in Dell BIOS, offering a pathway for a local authenticated malicious user to exploit the flaw and tamper with a UEFI variable.

Affected Systems and Versions

All versions of the CPG BIOS from Dell are impacted by this vulnerability. Therefore, users across various versions of this BIOS may be at risk if exploited.

Exploitation Mechanism

To exploit CVE-2023-28056, a local authenticated malicious user with administrator privileges needs to leverage the improper input validation flaw in the Dell BIOS to manipulate a UEFI variable, potentially causing unauthorized changes.

Mitigation and Prevention

In light of CVE-2023-28056, adopting immediate steps, incorporating long-term security practices, and ensuring timely patching and updates are crucial to mitigate the risks associated with this vulnerability.

Immediate Steps to Take

Users are advised to monitor security advisories from Dell and apply any patches or updates provided to address the vulnerability promptly. Additionally, restricting access to system administrative privileges can help reduce the likelihood of exploitation.

Long-Term Security Practices

Implementing robust access control measures, regular security audits, and employee training on secure computing practices are essential for maintaining a secure BIOS environment.

Patching and Updates

Dell has released a security update addressing the improper input validation vulnerabilities within the Dell BIOS. Users are strongly encouraged to apply this patch as soon as possible to safeguard their systems against potential exploitation.