ThreadX Module Loader Heap OOB Read and CFI Gap

Executive Summary

This vulnerability involves two issues in the ThreadX loadable-module loader. When a device loads a malicious module via specific APIs, the system trusts attacker-controlled size and offset values in the module preamble. This leads to a heap out-of-bounds read due to incorrect handling of the code size field. Additionally, pointers for module entry and callbacks are computed without proper validation or checksum verification, creating a control-flow integrity gap.

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Detection Guidance

This vulnerability involves issues in the ThreadX loadable-module loader, specifically when loading attacker-controlled module objects. Detection requires analyzing memory handling and module loading processes in ThreadX-based systems. No specific commands are provided in the context to detect this issue.

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Impact Analysis

An attacker could exploit this to read sensitive memory contents, potentially exposing confidential data. While no direct write primitive was found, the out-of-bounds read may enable further attacks like information disclosure or denial of service by corrupting system state.

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Compliance Impact

This vulnerability involves out-of-bounds memory reads and unchecked module entry points in ThreadX, which could lead to unauthorized code execution or data exposure. Such flaws may violate compliance requirements under GDPR (data protection) and HIPAA (health data security) by enabling data breaches or unauthorized access to sensitive information.

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Mitigation Strategies

Disable loading of attacker-controlled module objects via ThreadX APIs like _txm_module_manager_memory_load and _txm_module_manager_in_place_load. Validate all module image lengths and checksums before processing. Restrict module loading to trusted sources only.

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