CVE-2021-22807 in GUIcon
Summary
by MITRE • 01/28/2022
A CWE-787: Out-of-bounds Write vulnerability exists that could cause arbitrary code execution when a malicious *.gd1 configuration file is loaded into the GUIcon tool. Affected Product: Eurotherm by Schneider Electric GUIcon Version 2.0 (Build 683.003) and prior
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Analysis
by VulDB Data Team • 01/28/2022
The vulnerability described represents a critical out-of-bounds write condition classified as CWE-787 that affects the Eurotherm GUIcon software version 2.0 build 683.003 and earlier releases. This flaw manifests when the application processes maliciously crafted *.gd1 configuration files through its graphical user interface, creating a potential pathway for remote code execution attacks. The vulnerability stems from inadequate bounds checking during the parsing of configuration file structures, specifically within the GUIcon tool's file processing routines that handle proprietary data formats.
The technical implementation of this vulnerability occurs when the application attempts to write data beyond the allocated memory boundaries of a buffer or array structure. When a malicious *.gd1 file is loaded, the parser fails to validate the size and structure of incoming data against predefined limits, allowing an attacker to manipulate memory layout through crafted input parameters. This memory corruption can overwrite adjacent memory locations including function pointers, return addresses, or other critical control structures that govern program execution flow. The flaw operates at the intersection of buffer management and input validation, where insufficient boundary checks enable attackers to write beyond intended memory regions.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it provides potential for arbitrary code execution within the context of the GUIcon application. An attacker who can convince a victim to load a malicious configuration file could gain complete control over the affected system, potentially leading to data compromise, privilege escalation, or establishment of persistent access points. The vulnerability affects a widely used industrial configuration tool that interfaces with critical manufacturing and process control systems, making it particularly dangerous in operational technology environments where system integrity and availability are paramount. This threat model aligns with ATT&CK technique T1203, which describes exploitation of software vulnerabilities to gain unauthorized access.
Mitigation strategies for this vulnerability should focus on immediate patch management and input validation improvements. Organizations should prioritize updating to the latest available version of GUIcon that addresses this specific out-of-bounds write condition, as provided by Schneider Electric through their official support channels. Additionally, implementing strict file validation procedures including content type verification, size limitations, and signature checking for configuration files can help prevent exploitation attempts. Network segmentation and least privilege access controls should be enforced to limit potential attack surface exposure, while monitoring systems should be configured to detect unusual file loading patterns or suspicious network activity associated with the affected application. The vulnerability demonstrates the critical importance of robust memory safety practices in industrial control software, where traditional security measures may not adequately protect against such fundamental implementation flaws that can lead to complete system compromise.