CVE-2020-7555 in IGSS Definition
Summary
by MITRE • 11/20/2020
A CWE-787 Out-of-bounds Write vulnerability exists in IGSS Definition (Def.exe) version 14.0.0.20247 that could cause Remote Code Execution when malicious CGF (Configuration Group File) file is imported to IGSS Definition.
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Analysis
by VulDB Data Team • 12/09/2020
The vulnerability identified as CVE-2020-7555 represents a critical out-of-bounds write flaw classified under CWE-787 within the IGSS Definition software component known as Def.exe. This issue affects version 14.0.0.20247 and creates a remote code execution vector through the manipulation of Configuration Group File format. The vulnerability stems from inadequate input validation mechanisms that fail to properly bounds-check data structures when processing imported CGF files, allowing attackers to craft malicious payloads that can overwrite memory regions beyond intended boundaries.
The technical exploitation of this vulnerability occurs during the import process of CGF files within the IGSS Definition environment, where the Def.exe application lacks proper sanitization of user-supplied data. When a malicious CGF file is processed, the software's memory management routines do not adequately verify array indices or buffer limits, creating opportunities for attackers to write data beyond allocated memory segments. This memory corruption can be leveraged to overwrite critical program variables, function pointers, or return addresses, ultimately enabling remote code execution capabilities. The flaw exists in the software's configuration file parsing logic where insufficient boundary checks allow arbitrary memory writes that can be strategically positioned to redirect execution flow.
The operational impact of this vulnerability extends beyond simple remote code execution as it represents a severe threat to industrial control system environments where IGSS Definition is commonly deployed. Attackers can leverage this vulnerability to gain unauthorized access to critical infrastructure management systems, potentially leading to system compromise, data manipulation, or operational disruption. The remote nature of the exploit means that attackers can target systems without physical access, making this particularly dangerous in environments where industrial networks may have limited security controls. The vulnerability affects the integrity and availability of configuration management processes, potentially allowing attackers to modify system configurations or inject malicious code into operational environments.
Mitigation strategies for CVE-2020-7555 should prioritize immediate software updates from the vendor to address the out-of-bounds write vulnerability in Def.exe. Organizations should implement network segmentation to limit access to IGSS Definition systems and restrict the import of external CGF files through strict access controls. Additional defensive measures include deploying network monitoring solutions to detect suspicious file transfer activities and implementing application whitelisting to prevent unauthorized execution of malicious CGF files. The vulnerability aligns with ATT&CK technique T1059.007 for remote code execution through application-specific flaws and represents a significant concern for industrial control systems under the MITRE ATT&CK framework for ICS environments. System administrators should also consider implementing robust input validation procedures and regular security assessments to identify similar vulnerabilities in other industrial control system components.