CVE-2021-46749 : Exploit Details and Defense Strategies
Learn about CVE-2021-46749, a security vulnerability in AMD Secure Processor that could lead to a denial of service. Find out affected systems, exploitation details, and mitigation steps.
CVE-2021-46749 is a vulnerability in AMD Secure Processor (ASP) that may lead to an out of bounds read in System Management Interface (SMI) mailbox checksum calculation, potentially resulting in a denial of service.
Understanding CVE-2021-46749
What is CVE-2021-46749?
Insufficient bounds checking in AMD Secure Processor could allow an attacker to trigger a data abort, leading to a denial of service risk.
The Impact of CVE-2021-46749
The vulnerability could be exploited to cause a denial of service on affected systems.
Technical Details of CVE-2021-46749
Vulnerability Description
AMD Secure Processor (ASP) lacks proper bounds checking, enabling an out of bounds read in System Management Interface (SMI) mailbox checksum calculation.
Affected Systems and Versions
- Ryzen™ 2000, 3000, and 5000 Series Desktop Processors
- Ryzen™ Desktop processor with Radeon™ Graphics
- 3rd Gen AMD Ryzen™ Threadripper™ Processors
- Ryzen™ Threadripper™ PRO Processors
- Ryzen™ Mobile Processors with Radeon™ Graphics
- Athlon™ 3000 Series Mobile Processors
Exploitation Mechanism
Attackers can exploit the flaw by manipulating the checksum calculation in SMI mailbox, potentially causing a denial of service.
Mitigation and Prevention
Immediate Steps to Take
- Apply patches and updates from AMD.
- Monitor AMD's security advisories for further guidance.
Long-Term Security Practices
- Implement robust security measures to prevent unauthorized access.
- Regularly update firmware and software to mitigate known vulnerabilities.
- Conduct security assessments and audits to detect and address weaknesses.
Patching and Updates
Update affected AMD processors with the latest patches to address this vulnerability.