Microchip GUIX CVE-2020-25449 Heap Overflow Analysis with POC

Vulnerability Summary: Unbound Heap Overflow in GUIX_malloc Vulnerability Overview Vulnerability ID: CVE-2020-25449 Vulnerability Type: Heap Overflow CVSS Score: 7.1 / 10 (High Severity) Affected Component: function (located in ) Root Cause: The function fails to properly validate input parameters during memory allocation, allowing a maliciously crafted parameter to trigger a heap overflow. Attackers can control the value to overwrite adjacent memory regions, potentially leading to arbitrary code execution or denial of service. Trigger Conditions: When the parameter is negative or an extremely large value, the call may return an unexpected address, causing subsequent write operations to go out of bounds. Impact Scope Affected Versions: - All unpatched versions of (as of 2020-08-26) - All GUIX applications utilizing this function (e.g., embedded systems, industrial control software) Affected Platforms: - All embedded platforms supporting C language compilation (ARM, MIPS, x86, etc.) - Systems dependent on the Microchip GUIX graphics library Potential Impacts: - Remote Code Execution (RCE) - Denial of Service (DoS) - Information Disclosure (reading sensitive data via memory overwrites) Remediation Official Patch: - A fixed version has been released: Updated (post-2020-08-26) - Fix Details: Added validation for the parameter before the call (ensuring it is non-negative and less than the maximum allowed value) Temporary Mitigation Measures: - Manually validate the parameter before calling - Enable compiler stack protection (e.g., ) - Restrict user input ranges to avoid passing anomalous values Upgrade Recommendations: - Immediately upgrade to the latest stable version of the GUIX library - Audit the project for direct calls to and replace them with secure wrapper functions POC Code (Example) > ⚠️ Note: The above POC is for demonstration purposes only. Actual exploitation requires specific environmental conditions and memory layout. Do not use for illegal purposes. Additional Key Information Disclosure Date: 2020-08-26 Reporter: Red Hat Security Team Related CVE: None (Independent vulnerability) Fix Status: Fixed (Manual upgrade required)

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Microchip GUIX CVE-2020-25449 Heap Overflow Analysis with POC