CVE-2020-8693 in Ethernet 700 Series Controller
Summary
by MITRE • 11/12/2020
Improper buffer restrictions in the firmware of the Intel(R) Ethernet 700 Series Controllers may allow a privileged user to potentially enable escalation of privilege and/or denial of service via local access.
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Analysis
by VulDB Data Team • 12/06/2020
The vulnerability identified as CVE-2020-8693 resides within the firmware implementation of Intel(R) Ethernet 700 Series Network Controllers, representing a critical security flaw that undermines system integrity and operational availability. This issue manifests through improper buffer restrictions that exist within the firmware components responsible for network packet processing and system communication. The vulnerability affects a broad range of enterprise and data center networking equipment where Intel's 700 Series controllers are deployed, potentially exposing organizations to significant security risks.
The technical flaw stems from inadequate bounds checking and buffer management within the firmware's network processing routines. When the network controller processes incoming packets or manages internal communications, it fails to properly validate buffer boundaries, creating opportunities for memory corruption scenarios. This weakness allows a privileged local user to manipulate memory structures through carefully crafted network traffic or firmware interactions, potentially leading to arbitrary code execution within the firmware context. The vulnerability operates at the firmware level, making it particularly dangerous as it bypasses traditional operating system security controls and can persist across system reboots.
From an operational impact perspective, this vulnerability creates multiple attack vectors that could result in severe consequences for affected systems. A malicious privileged user with local access could exploit the buffer overflow conditions to escalate privileges from user-level to administrative or firmware-level access, effectively compromising the entire network controller functionality. Additionally, the vulnerability could enable denial of service conditions where carefully constructed network traffic could cause the controller to crash or become unresponsive, disrupting network connectivity and potentially affecting business operations. The persistent nature of firmware-level exploits means that even after system reboots, the compromised controller may remain vulnerable until firmware updates are applied.
Mitigation strategies for CVE-2020-8693 require immediate firmware updates from Intel to address the buffer restriction flaws. Organizations should prioritize patching affected systems and validate that the firmware updates properly resolve the identified vulnerabilities. Network segmentation and access controls should be implemented to limit local access to affected controllers, reducing the attack surface. Security monitoring should be enhanced to detect anomalous network traffic patterns that might indicate exploitation attempts. The vulnerability aligns with CWE-129, which addresses improper validation of buffer boundaries, and maps to ATT&CK technique T1068, which covers local privilege escalation through system weaknesses. Regular firmware inventory management and vulnerability assessment procedures should be established to prevent similar issues from arising in other network components.
The broader implications of this vulnerability highlight the critical importance of firmware security in modern network infrastructure. As network controllers increasingly become targets for sophisticated attacks, the need for comprehensive firmware security measures becomes paramount. Organizations must implement robust supply chain security practices and maintain continuous monitoring of firmware versions to ensure protection against similar vulnerabilities. The incident underscores the necessity for regular security assessments of embedded systems and the implementation of secure development practices throughout the firmware lifecycle.