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CVE-2021-21555 : What You Need to Know

Discover details of CVE-2021-21555 affecting Dell PowerEdge BIOS Intel 15G versions before 2.11.2, allowing local malicious users to execute arbitrary code or cause denial of service.

Dell PowerEdge BIOS Intel 15G versions before 2.11.2 are affected by a heap-based buffer overflow vulnerability, allowing a local malicious user with high privileges to execute arbitrary code or cause a denial of service.

Understanding CVE-2021-21555

This CVE refers to a specific vulnerability found in Dell PowerEdge BIOS Intel 15G versions before 2.11.2, potentially enabling attackers to exploit the system.

What is CVE-2021-21555?

The vulnerability in Dell PowerEdge BIOS Intel 15G allows a local malicious user with high privileges to trigger a heap-based buffer overflow, potentially resulting in denial of service attacks, code execution, or information disclosure.

The Impact of CVE-2021-21555

The impact of this vulnerability is rated as MEDIUM severity with a CVSS base score of 6.1. It could lead to serious consequences such as service disruption, arbitrary code execution, or leakage of sensitive information.

Technical Details of CVE-2021-21555

This section delves into the technical aspects of the CVE, including the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability stems from a heap-based buffer overflow in Dell PowerEdge BIOS Intel 15G versions before 2.11.2 when NVDIMM-N is installed. This allows a local attacker to execute arbitrary code or initiate a denial of service attack.

Affected Systems and Versions

The affected products include Dell PowerEdge R640, R740, R740XD, R840, R940, R940xa, MX740c, MX840c, and T640 Server BIOS versions prior to 2.11.2.

Exploitation Mechanism

A local malicious user with high privileges can exploit the vulnerability by triggering the heap-based buffer overflow in systems with NVDIMM-N installed, potentially leading to a range of harmful outcomes.

Mitigation and Prevention

Protecting systems from CVE-2021-21555 involves taking immediate steps, implementing long-term security practices, and ensuring timely patching and updates.

Immediate Steps to Take

System administrators are advised to restrict access to high-privileged users, monitor BIOS modifications, and apply security configurations to mitigate the risk of exploitation.

Long-Term Security Practices

To enhance overall system security, organizations should regularly update BIOS versions, conduct vulnerability assessments, and enforce least privilege access controls.

Patching and Updates

Dell has released BIOS version 2.11.2 to address the vulnerability. It is crucial for organizations to promptly apply the patch to safeguard their systems from potential threats.

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