Untrusted Pointer Dereference in Samsung mTower

Executive Summary

This vulnerability is an untrusted pointer dereference issue in Samsung's Open Source mTower. It allows pointer manipulation where Trusted Applications (TAs) can pass invalid pointers like NULL or wrapping memory ranges. The mTower fails to validate these pointers properly before dereferencing them in secure-kernel syscalls, potentially causing out-of-bounds memory access in the secure world.

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Detection Guidance

This vulnerability involves improper pointer validation in Samsung mTower's secure-kernel syscalls. Detection requires checking for unvalidated TA-supplied pointers in syscalls like copy helpers and crypto operations. Review kernel logs for out-of-bounds memory access errors or NULL pointer dereferences in secure world contexts. Use static analysis tools to inspect pointer range checks in tee_svc.c and tee_svc_cryp.c.

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Impact Analysis

This vulnerability could allow malicious or buggy Trusted Applications to crash the secure world or execute unauthorized memory operations. This might lead to denial of service, data corruption, or unauthorized access to sensitive data in systems using mTower, such as mobile devices or IoT platforms.

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Compliance Impact

This vulnerability could potentially lead to unauthorized memory access in the secure world, which may result in data breaches or corruption. For GDPR, this could impact data integrity and confidentiality requirements. For HIPAA, it might compromise protected health information if exploited.

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Mitigation Strategies

Update mTower to the latest version (commit 102d3dc75cf8e58e68e4bea54ae3c803992c91be or later) to apply the pointer validation fix in secure-kernel syscalls.

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