CVE-2018-19121 in libIEC61850
Summary
by MITRE
An issue has been found in libIEC61850 v1.3. It is a SEGV in Ethernet_receivePacket in ethernet_bsd.c.
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Analysis
by VulDB Data Team • 06/05/2023
The vulnerability identified as CVE-2018-19121 represents a critical software flaw within libIEC61850 version 1.3, specifically manifesting as a segmentation fault during packet reception processing. This issue occurs within the Ethernet_receivePacket function of the ethernet_bsd.c module, which forms part of the broader IEC 61850 communication library used extensively in power system automation and industrial control environments. The vulnerability stems from inadequate input validation and memory management practices during network packet processing, creating a potential crash condition that could disrupt critical infrastructure operations.
The technical implementation of this flaw involves a buffer overread or improper memory access scenario where the Ethernet_receivePacket function fails to properly validate packet length or buffer boundaries before processing incoming network data. This condition typically arises when the library receives malformed or unexpectedly large network packets that exceed expected buffer sizes, causing the application to attempt accessing memory locations outside of allocated boundaries. The segmentation fault occurs when the processor detects this invalid memory access, resulting in an abrupt program termination and system crash. This type of vulnerability aligns with CWE-125, which describes out-of-bounds read conditions, and represents a classic example of improper input validation in network protocol implementations. The flaw demonstrates how network communication libraries can be susceptible to denial-of-service attacks through carefully crafted packet payloads.
The operational impact of CVE-2018-19121 extends beyond simple application crashes to potentially compromise the reliability and availability of critical power system infrastructure. In industrial environments where libIEC61850 is deployed for substation automation, protective relaying, and supervisory control systems, a segmentation fault can result in complete system outages or partial service degradation. The vulnerability affects systems implementing IEC 61850 standards for communication between intelligent electronic devices, potentially disrupting protection schemes, data acquisition, and control functions that are essential for power grid stability. This type of vulnerability can be exploited by attackers to perform denial-of-service attacks against industrial control systems, aligning with ATT&CK technique T1499.002 for network denial-of-service attacks. The impact is particularly severe in critical infrastructure environments where system uptime and reliability are paramount for public safety and operational continuity.
Mitigation strategies for CVE-2018-19121 should focus on immediate patching of affected libIEC61850 versions, implementing network segmentation and monitoring to detect anomalous packet patterns, and establishing robust input validation mechanisms. Organizations should upgrade to patched versions of libIEC61850 that address the buffer overflow condition in ethernet_bsd.c, while also implementing network intrusion detection systems to monitor for malformed packets that could exploit this vulnerability. Additional defensive measures include deploying application-level firewalls, implementing rate limiting for network traffic, and establishing comprehensive monitoring protocols to detect system crashes or unexpected restarts. The vulnerability underscores the importance of secure coding practices in industrial communication libraries and highlights the need for regular security assessments of critical infrastructure software components. System administrators should also consider implementing redundant communication paths and backup systems to maintain operational continuity during vulnerability remediation efforts.