CVE-2021-21557 : Vulnerability Insights and Analysis
Learn about CVE-2021-21557, a critical vulnerability in Dell PowerEdge BIOS & Precision Rack BIOS, allowing local attackers with high privileges to execute arbitrary code or compromise system integrity.
Dell PowerEdge Server BIOS and select Dell Precision Rack BIOS contain a critical vulnerability that can be exploited by a local malicious user with high privileges. This could result in a denial of service, arbitrary code execution, or information disclosure in the System Management Mode.
Understanding CVE-2021-21557
This section delves into the details of the CVE-2021-21557 vulnerability in Dell PowerEdge and Precision Rack BIOS.
What is CVE-2021-21557?
The CVE-2021-21557 vulnerability involves an out-of-bounds array access issue in Dell PowerEdge and Precision Rack BIOS.
The Impact of CVE-2021-21557
The impact of this vulnerability includes the potential for denial of service, arbitrary code execution, or leakage of sensitive information by a local malicious user with high privileges.
Technical Details of CVE-2021-21557
Providing insights into the technical aspects of the CVE-2021-21557 vulnerability.
Vulnerability Description
The vulnerability arises from improper input validation, allowing unauthorized access to critical system functions, posing a significant threat to system integrity.
Affected Systems and Versions
The vulnerability affects Dell PowerEdge BIOS Intel 15G versions less than 2.11.2, having a custom version type.
Exploitation Mechanism
A local malicious user with high privileges can exploit this vulnerability to trigger a denial of service, execute arbitrary code, or gain unauthorized access to sensitive information.
Mitigation and Prevention
This section provides strategies to mitigate and prevent exploitation of the CVE-2021-21557 vulnerability.
Immediate Steps to Take
Immediately update the affected systems to version 2.11.2 or higher to patch the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Regularly monitor and update BIOS versions, implement strict access controls, and conduct security audits to enhance overall system security.
Patching and Updates
Stay informed about security advisories from Dell, apply patches promptly, and follow best practices for BIOS security to reduce the risk of similar vulnerabilities.