CVE-2020-8729 in Server Board
Summary
by MITRE
Buffer copy without checking size of input for some Intel(R) Server Boards, Server Systems and Compute Modules before version 1.59 may allow an authenticated user to potentially enable escalation of privilege via local access.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 11/09/2020
This vulnerability affects Intel server boards, server systems, and compute modules with firmware versions prior to 1.59, representing a critical privilege escalation risk that can be exploited by authenticated local users. The flaw resides in the firmware implementation where buffer copy operations fail to validate the size of input data before copying it into fixed-size buffers, creating a classic buffer overflow condition that can be leveraged for malicious code execution. The vulnerability specifically impacts the firmware components responsible for system management and configuration operations, where insufficient input validation allows attackers to craft malicious payloads that exceed buffer boundaries. This type of vulnerability falls under CWE-121, which describes stack-based buffer overflow conditions, and can be categorized as a privilege escalation vector through the ATT&CK framework under privilege escalation techniques. The affected systems typically include enterprise-grade server hardware where firmware updates are critical for maintaining security posture, and the vulnerability can be exploited through local access points such as physical console access or network-based authenticated sessions.
The technical implementation of this vulnerability stems from improper bounds checking during firmware operations, where input data from authenticated users is copied into insufficiently sized memory buffers without adequate validation of source data length. Attackers can exploit this by crafting input sequences that exceed the expected buffer capacity, potentially overwriting adjacent memory locations including return addresses, function pointers, or other critical control data structures. The buffer overflow can result in arbitrary code execution with the privileges of the firmware context, which typically operates at the highest privilege level within the system. This creates a significant risk for enterprise environments where server firmware is often not regularly updated, as the attack surface remains exposed for extended periods. The vulnerability is particularly concerning because it requires only local authentication, meaning that any user with legitimate access to the system can potentially exploit this weakness to gain elevated privileges. The impact extends beyond simple privilege escalation to potentially allow attackers to modify system firmware, disable security features, or establish persistent backdoors within the server infrastructure.
The operational impact of this vulnerability is substantial for enterprise IT environments, as it provides a pathway for attackers to gain elevated privileges on critical server infrastructure without requiring external network access or sophisticated attack vectors. Organizations running affected Intel server hardware are particularly vulnerable since the firmware update process often requires system downtime and may not be performed regularly due to operational constraints or lack of awareness. The exploitation of this vulnerability can lead to complete system compromise, allowing attackers to access sensitive data, modify system configurations, or use the compromised server as a pivot point for attacks against other networked systems. Security teams must consider the potential for this vulnerability to be used in conjunction with other attack techniques, as the elevated privileges gained through firmware-level privilege escalation can enable more sophisticated attacks. The vulnerability also highlights the importance of firmware security in enterprise environments, where traditional network-based security controls may not prevent exploitation of firmware-level weaknesses. Organizations should implement regular firmware inventory tracking and update procedures, as well as monitor for any unauthorized firmware modifications that could indicate exploitation attempts.
Mitigation strategies for this vulnerability require immediate firmware updates to version 1.59 or later, which address the buffer size validation issues through proper input length checking and bounds validation. System administrators should prioritize updating affected server hardware and implement firmware update policies that ensure regular security patches are applied across all enterprise infrastructure. Additional mitigations include implementing strict access controls to prevent unauthorized local access, monitoring for suspicious firmware modification attempts, and maintaining detailed inventory records of all firmware versions across the network. The vulnerability demonstrates the critical need for firmware security awareness and regular vulnerability assessments that include firmware components, as these often represent overlooked attack surfaces in enterprise security programs. Organizations should also consider implementing firmware integrity checking mechanisms and establishing procedures for rapid response to firmware-related security incidents. The remediation process requires careful planning due to the potential for firmware update failures to cause system downtime, making it essential for organizations to test updates in controlled environments before widespread deployment. This vulnerability serves as a reminder of the importance of maintaining comprehensive security postures that extend beyond traditional software security to include hardware and firmware components that form the foundation of enterprise infrastructure security.