CVE-2020-3258 in IOS
Summary
by MITRE
Multiple vulnerabilities in Cisco IOS Software for Cisco 809 and 829 Industrial Integrated Services Routers (Industrial ISRs) and Cisco 1000 Series Connected Grid Routers (CGR1000) could allow an unauthenticated, remote attacker or an authenticated, local attacker to execute arbitrary code on an affected system or cause an affected system to crash and reload. For more information about these vulnerabilities, see the Details section of this advisory.
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Analysis
by VulDB Data Team • 10/21/2020
The vulnerability identified as CVE-2020-3258 represents a critical security flaw affecting Cisco's industrial networking equipment, specifically targeting the IOS software running on Cisco 809 and 829 Industrial ISRs and Cisco 1000 Series CGR1000 routers. These devices operate within industrial control systems and grid infrastructure environments where reliability and security are paramount. The affected platforms are designed for deployment in critical infrastructure settings including energy grids, manufacturing facilities, and other industrial environments where network availability directly impacts operational continuity. The vulnerability landscape for these devices is particularly concerning given their role in supporting mission-critical operations and their often limited remote management capabilities.
The technical nature of this vulnerability stems from improper input validation and memory handling within the affected IOS software implementations. Attackers can exploit these weaknesses through both remote unauthenticated and local authenticated access vectors, creating a significant attack surface that spans from external network boundaries to internal network segments. The flaw allows for arbitrary code execution, which represents a severe privilege escalation capability that could enable attackers to gain full system control. Additionally, the vulnerability can trigger system crashes and reloads, creating denial of service conditions that could be particularly damaging in industrial environments where continuous operation is required. This dual impact of code execution and system instability makes the vulnerability particularly dangerous for operational technology environments where system uptime is critical.
The operational impact of CVE-2020-3258 extends beyond simple system compromise to potentially disrupt critical infrastructure operations. In industrial settings, these routers often serve as gateways between operational technology networks and corporate networks, making them prime targets for attackers seeking to establish persistent access points. The vulnerability could enable attackers to gain unauthorized access to industrial control systems, potentially leading to operational disruptions, data compromise, or even physical safety risks in environments such as power generation facilities or manufacturing plants. The ability to execute arbitrary code remotely without authentication means that attackers could potentially deploy malware, establish backdoors, or manipulate network traffic to interfere with industrial processes. The crash and reload capabilities could also be exploited to create denial of service conditions that might be difficult to recover from in environments with limited remote management capabilities.
Mitigation strategies for CVE-2020-3258 should prioritize immediate software updates from Cisco, as the company has released patches addressing these specific vulnerabilities. Organizations should implement network segmentation to limit access to these critical devices, ensuring that only authorized personnel can reach them through secure network paths. The implementation of network access controls, including firewall rules and access control lists, can help reduce the attack surface by limiting both remote and local access attempts. Security monitoring should be enhanced to detect unusual network activity patterns that might indicate exploitation attempts, particularly around the specific services and ports associated with the vulnerable IOS software components. Regular vulnerability assessments and security audits should be conducted to ensure that all industrial networking equipment remains up to date with security patches. The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a potential ATT&CK technique involving privilege escalation and persistence mechanisms that could be leveraged by advanced persistent threat actors targeting industrial control systems.