CVE-2021-33625 : What You Need to Know
Learn about the CVE-2021-33625 vulnerability discovered in Kernel 5.x in Insyde InsydeH2O affecting HddPassword. Understand the impact, technical details, affected systems, and mitigation steps.
An issue was discovered in Kernel 5.x in Insyde InsydeH2O that impacts HddPassword. This vulnerability arises from the improper validation of buffer addresses within Software SMI services, enabling the utilization of SMRAM, MMIO, or OS kernel addresses.
Understanding CVE-2021-33625
This section delves into the nature of the CVE-2021-33625 vulnerability.
What is CVE-2021-33625?
The vulnerability in Kernel 5.x in Insyde InsydeH2O affects HddPassword by allowing the exploitation of SMRAM, MMIO, or OS kernel addresses due to inadequate buffer address validation.
The Impact of CVE-2021-33625
The vulnerability poses a serious threat as malicious actors can leverage it to access critical system areas and execute unauthorized actions.
Technical Details of CVE-2021-33625
Explore the technical aspects of CVE-2021-33625 in this section.
Vulnerability Description
The issue stems from the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL not verifying the buffer address validity, facilitating the misuse of sensitive system addresses.
Affected Systems and Versions
All systems running Kernel 5.x in Insyde InsydeH2O with the specified Software SMI services are vulnerable to this exploit.
Exploitation Mechanism
By exploiting the lack of address validation in the Software SMI services' Communicate() function, attackers can manipulate sensitive system areas.
Mitigation and Prevention
Discover how to mitigate the risks associated with CVE-2021-33625 in this section.
Immediate Steps to Take
Immediately update the affected systems with security patches or workarounds provided by the vendor to prevent exploitation of the vulnerability.
Long-Term Security Practices
Implement robust security measures such as regular system updates, network segmentation, and access controls to enhance overall cybersecurity posture.
Patching and Updates
Stay informed about security advisories and patches released by the vendor to address CVE-2021-33625 and other potential vulnerabilities.