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ExecuTorch (.pte) Verification Dropped PoC
CWE-252/CWE-125: verification level silently dropped -> OOB READ / SIGSEGV
Bug
_load_for_executorch_from_buffer(buf, verification=InternalConsistency) passes verification to Module constructor, but Module constructor has NO verification parameter — the value is discarded. Module::load() defaults to Verification::Minimal, which only checks the root offset.
All internal FlatBuffer offsets (vtable entries, execution_plan vector, plan->name() string) are attacker-controlled and unchecked. Program::method_meta() dereferences corrupted string pointer -> OOB read / SIGSEGV.
Files
malicious.pte- Pre-built malicious .pte fileharness.py- Generates malicious .pte and demonstrates crash
Run
pip install executorch torch
python3 harness.py # Builds artifact + demonstrates SIGSEGV
Expected Output
[+] CONFIRMED: SIGSEGV (out-of-bounds read in Program::method_meta).
Memory-safety defect reachable from the default .pte load API.
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