CVE-2021-26333 : Security Advisory and Response
Learn about CVE-2021-26333, an information disclosure vulnerability in the AMD Platform Security Processor (PSP) chipset driver that allows potential data leaks from uninitialized physical pages. Find out the impact, affected versions, and mitigation steps.
An information disclosure vulnerability exists in AMD Platform Security Processor (PSP) chipset driver, allowing low privileged users to potentially leak data from uninitialized physical pages.
Understanding CVE-2021-26333
This CVE refers to an information disclosure vulnerability within the AMD Chipset Driver.
What is CVE-2021-26333?
The CVE-2021-26333 pertains to an information disclosure vulnerability in the AMD PSP chipset driver, enabling low privileged users to manipulate the driver and potentially access uninitialized physical memory pages.
The Impact of CVE-2021-26333
This vulnerability could lead to unauthorized access to sensitive data, compromising the confidentiality and integrity of the affected systems.
Technical Details of CVE-2021-26333
Here are the technical specifics of CVE-2021-26333:
Vulnerability Description
The discretionary access control list (DACL) in the AMD PSP driver allows unauthorized users to send requests and potentially access uninitialized physical memory pages, resulting in data leaks.
Affected Systems and Versions
The PSP Driver version less than 5.17.0.0 is affected by this vulnerability.
Exploitation Mechanism
Exploiting this vulnerability involves manipulating the discretionary access control list (DACL) of the AMD PSP driver to gain unauthorized access to uninitialized physical memory pages.
Mitigation and Prevention
To mitigate the risks associated with CVE-2021-26333, consider the following preventive measures:
Immediate Steps to Take
- Apply security patches or updates provided by AMD to address this vulnerability.
- Restrict access to vulnerable systems and ensure only authorized users can interact with the PSP driver.
Long-Term Security Practices
- Regularly update and patch all software and drivers to prevent security vulnerabilities.
- Implement the principle of least privilege to limit access rights for users and applications.
Patching and Updates
AMD has released security updates to address CVE-2021-26333. It is crucial to promptly apply these patches to ensure the security of the affected systems.