CVE-2020-8332 : Vulnerability Insights and Analysis
Discover the impact of CVE-2020-8332, a vulnerability in legacy BIOS mode USB drivers of Lenovo and IBM System x servers. Learn about affected systems, exploitation risks, and mitigation steps.
A potential vulnerability in the SMI callback function used in the legacy BIOS mode USB drivers in some legacy Lenovo and IBM System x servers may allow arbitrary code execution. Learn about the impact, technical details, and mitigation steps for CVE-2020-8332.
Understanding CVE-2020-8332
This CVE involves a vulnerability in legacy BIOS mode USB drivers in certain Lenovo and IBM System x servers, potentially leading to arbitrary code execution.
What is CVE-2020-8332?
The vulnerability in the SMI callback function of legacy BIOS mode USB drivers in specific Lenovo and IBM System x servers could permit attackers to execute arbitrary code. Servers operating in UEFI mode are not impacted.
The Impact of CVE-2020-8332
The CVSS score for this vulnerability is 6.4, indicating a medium severity issue with high impacts on confidentiality, integrity, and availability. The attack complexity is high, and local access is required.
Technical Details of CVE-2020-8332
This section provides insights into the vulnerability, affected systems, and the exploitation mechanism.
Vulnerability Description
The vulnerability stems from a time-of-check time-of-use (TOCTOU) race condition (CWE-367) in the SMI callback function of legacy BIOS mode USB drivers.
Affected Systems and Versions
- Affected products: System x by Lenovo and IBM
- Versions: Various versions of System x servers
Exploitation Mechanism
- Attack Complexity: High
- Attack Vector: Local
- Privileges Required: High
- User Interaction: None
- Scope: Unchanged
Mitigation and Prevention
To safeguard systems from CVE-2020-8332, follow these mitigation strategies:
Immediate Steps to Take
- Update system firmware to the recommended version or newer as specified in the LEN-38625 Product Impact section.
Long-Term Security Practices
- Regularly update firmware and apply security patches.
- Implement strict access controls and monitoring mechanisms.
Patching and Updates
- Stay informed about security advisories and promptly apply relevant patches and updates.