CVE-2020-3225 in IOS
Summary
by MITRE
Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to insufficient input processing of CIP traffic. An attacker could exploit these vulnerabilities by sending crafted CIP traffic to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.
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Analysis
by VulDB Data Team • 10/21/2020
The vulnerability identified as CVE-2020-3225 represents a critical denial of service weakness within Cisco's industrial networking infrastructure, specifically affecting the Common Industrial Protocol implementation in IOS and IOS XE software versions. This flaw resides in the processing of industrial communication traffic that flows through network devices, making it particularly concerning for industrial control systems and manufacturing environments where continuous network availability is paramount. The Common Industrial Protocol serves as a foundational communication standard for industrial automation and control systems, enabling devices to communicate and exchange data within industrial environments. When exploited, this vulnerability allows unauthenticated remote attackers to manipulate the network infrastructure without requiring any credentials or prior access to the system.
The technical root cause of this vulnerability stems from inadequate input validation and processing within the CIP traffic handling mechanism of Cisco's network operating systems. The flaw manifests when the affected software receives specially crafted CIP packets that exceed normal processing parameters or contain malformed data structures that the implementation fails to properly sanitize. This insufficient input processing creates a condition where the device's internal state becomes corrupted or unstable, ultimately leading to a system crash or reload event. The vulnerability specifically affects how the software handles incoming CIP traffic, which is commonly used in industrial environments for device communication, configuration, and control operations. This weakness falls under the category of improper input validation as classified by CWE-20, which directly relates to the failure to properly validate or sanitize input data before processing.
The operational impact of CVE-2020-3225 extends far beyond simple network disruption, particularly in industrial environments where network reliability directly correlates with operational safety and productivity. When an affected device experiences a reload due to this vulnerability, it can result in complete loss of communication between industrial devices, potentially causing production line shutdowns, safety system failures, or operational disruptions that may extend for hours or days. The remote exploitation capability means that attackers can target these systems from outside the network perimeter, making traditional network segmentation strategies insufficient for protection. This vulnerability particularly affects industrial control systems that rely on continuous network connectivity for real-time operations, where even brief service interruptions can result in significant financial losses, safety hazards, or regulatory compliance issues.
Organizations operating Cisco devices in industrial environments must implement immediate mitigation strategies to protect against exploitation of this vulnerability. The primary recommended approach involves applying the latest security patches and software updates provided by Cisco, which address the input validation flaws in the CIP processing implementation. Network segmentation should be enhanced through firewall rules that restrict CIP traffic to authorized networks only, while implementing access control lists that filter suspicious or malformed CIP packets before they reach the vulnerable software components. Monitoring and logging of industrial protocol traffic should be strengthened to detect anomalous CIP packet patterns that may indicate exploitation attempts. Additionally, organizations should consider implementing network intrusion detection systems specifically configured to identify and alert on suspicious CIP traffic patterns. From an ATT&CK framework perspective, this vulnerability maps to the T1498 technique for network denial of service, and the T1071.001 sub-technique for application layer protocol usage, highlighting the need for both defensive and monitoring controls to address these threats effectively.