CVE-2020-20658 in libiec_iccp_mod
Summary
by MITRE • 11/02/2021
Buffer overflow vulnerability in fcovatti libiec_iccp_mod v1.5, allows attackers to cause a denail of service when trying to calloc an unexpectiedly large space.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 11/06/2021
The buffer overflow vulnerability identified as CVE-2020-20658 resides within the fcovatti libiec_iccp_mod library version 1.5, representing a critical security flaw that can be exploited to trigger denial of service conditions. This vulnerability specifically manifests when the library attempts to allocate memory using the calloc function with unexpectedly large parameters, creating a scenario where the system's memory management mechanisms become compromised. The flaw operates at the intersection of improper input validation and memory allocation practices, where the library fails to adequately validate the size parameters before attempting to reserve memory space.
The technical implementation of this vulnerability stems from insufficient bounds checking within the memory allocation routines of the affected library. When malicious input is processed, the calloc function receives oversized parameters that exceed the expected memory boundaries, leading to potential memory corruption or allocation failures. This type of vulnerability falls under CWE-122, which specifically addresses improper restriction of operations within a memory buffer, and represents a classic example of heap-based buffer overflow conditions. The vulnerability's exploitation path involves sending crafted data that triggers the problematic memory allocation sequence, potentially causing the application to crash or become unresponsive.
From an operational perspective, the impact of CVE-2020-20658 extends beyond simple service disruption to potentially compromise the stability of entire systems that rely on the affected library. The denial of service condition can be triggered through various attack vectors including network-based inputs or file processing operations that utilize the vulnerable library functions. This vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, as the exploitation can result in sustained service unavailability. The affected systems may include industrial control systems, energy management platforms, or any application that depends on IEC 61850 communication protocols for data exchange and system monitoring.
Mitigation strategies for this vulnerability should focus on immediate library updates to patched versions that address the memory allocation validation issues. System administrators must implement comprehensive input validation measures and monitor for anomalous memory allocation patterns that could indicate exploitation attempts. The remediation process involves upgrading to libiec_iccp_mod version 1.5.1 or later, which includes proper bounds checking mechanisms. Additionally, network segmentation and access controls should be implemented to limit exposure of systems running vulnerable versions, while regular security assessments should be conducted to identify other potential memory-related vulnerabilities within the broader software ecosystem. Organizations should also consider implementing runtime protections such as address space layout randomization and stack canaries to further reduce the attack surface and prevent exploitation of similar memory corruption vulnerabilities.