CVE-2020-20664 in libiec_iccp_mod
Summary
by MITRE • 09/30/2021
libiec_iccp_mod v1.5 contains a segmentation violation in the component server_example1.c.
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Analysis
by VulDB Data Team • 10/04/2021
The vulnerability identified as CVE-2020-20664 affects libiec_iccp_mod version 1.5 and specifically targets the server_example1.c component within this industrial communication library. This library implements the IEC 61850 communication protocol standard which is widely used in smart grid and industrial automation systems for reliable data exchange between devices. The segmentation violation represents a critical memory access error that occurs when the software attempts to read or write to a memory location that has not been properly allocated or has been freed. This type of vulnerability falls under the category of memory corruption flaws that can lead to system instability and potential exploitation by malicious actors.
The technical flaw manifests as a segmentation fault during the execution of server_example1.c which typically handles incoming communication requests from IEC 61850 clients. When processing malformed or unexpected input data, the application fails to properly validate memory access patterns, leading to a crash condition that can be triggered through network-based attacks. This vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and CWE-129, which covers improper validation of array indices. The flaw essentially allows an attacker to send specially crafted packets that cause the server to access memory outside of its allocated bounds, potentially resulting in denial of service or more severe consequences depending on the execution environment.
From an operational perspective, this vulnerability poses significant risks to industrial control systems that rely on IEC 61850 protocols for communication. The affected system components are commonly deployed in critical infrastructure environments such as power generation, transmission, and distribution systems where service availability is paramount. A successful exploitation could result in system crashes that disrupt communication between substations and control centers, potentially leading to cascading failures in power grid operations. The vulnerability is particularly concerning because it affects the server component that handles client connections, making it a potential entry point for attackers seeking to compromise industrial network communications. According to ATT&CK framework, this vulnerability could be leveraged under technique T1499.004 for network denial of service attacks targeting industrial control systems.
Mitigation strategies for CVE-2020-20664 should prioritize immediate patching of the libiec_iccp_mod library to version 1.6 or later which contains the necessary memory validation fixes. Organizations should implement network segmentation and access controls to limit exposure of affected systems to untrusted networks. Additionally, monitoring systems should be configured to detect unusual traffic patterns that might indicate exploitation attempts. The remediation process should include thorough testing of patched components in isolated environments before deployment to production systems. Security teams should also consider implementing intrusion detection systems that can identify malformed IEC 61850 packets that could be used to trigger this vulnerability. Regular vulnerability assessments and penetration testing of industrial control systems should be conducted to identify similar memory corruption issues in other components of the communication stack.