CVE-2021-42059 : Exploit Details and Defense Strategies

An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.08.41, Kernel 5.1 before 05.16.41, Kernel 5.2 before 05.26.41, Kernel 5.3 before 05.35.41, and Kernel 5.4 before 05.42.20. This vulnerability allows a stack-based buffer overflow leading to arbitrary code execution in UEFI DisplayTypeDxe DXE driver.

Understanding CVE-2021-42059

This section delves deeper into the nature and impact of the identified CVE.

What is CVE-2021-42059?

In Insyde InsydeH2O Kernels prior to the specified versions, a stack-based buffer overflow vulnerability exists that can be exploited for executing arbitrary code within the UEFI DisplayTypeDxe DXE driver.

The Impact of CVE-2021-42059

The presence of this vulnerability can allow attackers to execute malicious code on affected systems, potentially leading to compromise and unauthorized access.

Technical Details of CVE-2021-42059

This section covers the technical aspects and details of CVE-2021-42059.

Vulnerability Description

The vulnerability is a stack-based buffer overflow issue within the UEFI DisplayTypeDxe DXE driver in specific versions of the Insyde InsydeH2O Kernel.

Affected Systems and Versions

Insyde InsydeH2O Kernel 5.0 before 05.08.41
Insyde InsydeH2O Kernel 5.1 before 05.16.41
Insyde InsydeH2O Kernel 5.2 before 05.26.41
Insyde InsydeH2O Kernel 5.3 before 05.35.41
Insyde InsydeH2O Kernel 5.4 before 05.42.20

Exploitation Mechanism

The vulnerability can be exploited through crafted input that triggers the buffer overflow, allowing the injection and execution of arbitrary code.

Mitigation and Prevention

Here are the steps to mitigate and prevent the exploitation of CVE-2021-42059.

Immediate Steps to Take

Apply security patches provided by the vendor promptly.
Monitor vendor updates and security advisories closely.

Long-Term Security Practices

Implement secure coding practices to prevent buffer overflow vulnerabilities.
Conduct regular security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Ensure that systems are regularly updated with the latest patches and security fixes to address known vulnerabilities.