CVE-2022-40762: Security: Memory Allocation with Excessive Size Value in the function TEE_Realloc · Issue #82 · Samsung/mTower

Affected components：

affected source code file: /tee/lib/libutee/tee_api.c, affected functions: TEE_Realloc

Attack vector(s)

To exploit the vulnerability, invoke the function TEE_Realloc and pass a large number to the parameter "len".

Suggested description of the vulnerability for use in the CVE

Memory Allocation with Excessive Size Value vulnerablity in TEE_Realloc function in Samsung Electronics mTower v0.3.0 (and earlier) allows a trusted application to trigger a Denial of Service (DoS) via invoking the function TEE_Realloc with an excessive number of the parameter "len".

Discoverer(s)/Credits

SyzTrust

Reference(s)

https://github.com/Samsung/mTower

void *TEE_Realloc(const void *buffer, uint32_t newSize)

Additional information

The function TEE_Realloc does not check the size of chunk to realloc. Executing the statement “tee_user_mem_realloc” with an excessive size value on a real IoT hardware (such as Numaker-PFM-M2351) will crash the trusted execution environment kernel and cause a Denial of Service (DoS).

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