CVE-2021-28211 Explained : Impact and Mitigation
Discover the impact of CVE-2021-28211, a heap overflow vulnerability in LzmaUefiDecompressGetInfo function in EDK II. Learn about affected versions, exploitation risks, and mitigation steps.
A heap overflow vulnerability has been identified in the LzmaUefiDecompressGetInfo function in the EDK II, which could allow an attacker to execute arbitrary code or cause a denial of service condition on the affected system.
Understanding CVE-2021-28211
This section provides an overview of the CVE-2021-28211 vulnerability in the EDK II firmware.
What is CVE-2021-28211?
The CVE-2021-28211 vulnerability is a heap overflow issue present in the LzmaUefiDecompressGetInfo function within EDK II, a widely used open-source UEFI firmware.
The Impact of CVE-2021-28211
Exploitation of this vulnerability could lead to arbitrary code execution or denial of service (DoS) attacks, posing a severe risk to the security and integrity of the affected systems.
Technical Details of CVE-2021-28211
In this section, we delve into specific technical aspects of the CVE-2021-28211 vulnerability.
Vulnerability Description
The vulnerability involves a heap overflow in the LzmaUefiDecompressGetInfo function of EDK II, allowing an attacker to corrupt memory and potentially execute malicious code.
Affected Systems and Versions
The EDK II version 'edk2-stable202008' is confirmed to be affected by CVE-2021-28211, possibly impacting systems that utilize this specific build.
Exploitation Mechanism
Attackers can exploit this vulnerability by crafting malicious input that triggers the heap overflow, leading to unauthorized code execution or system crashes.
Mitigation and Prevention
This section outlines steps that can be taken to mitigate the risks associated with CVE-2021-28211.
Immediate Steps to Take
Immediately apply security patches provided by TianoCore or EDK II to address the vulnerability and prevent potential exploitation.
Long-Term Security Practices
Implement secure coding practices, regularly update firmware to the latest versions, and conduct periodic security assessments to reduce the likelihood of similar vulnerabilities.
Patching and Updates
Stay informed about security advisories from TianoCore and apply patches promptly to ensure the protection of EDK II-based systems against known vulnerabilities.