wulonchia/circle-oob-read-poc

PoC: Samsung ONE Circle Format — Heap Buffer Overflow (OOB Read)

This repository contains a proof-of-concept demonstrating a heap-buffer-overflow (out-of-bounds read) in Samsung ONE's luci compiler when loading a malformed .circle model file.

Affected Component

• compiler/luci/import/src/Nodes/CircleConst.cpp ~L214-221
• compiler/luci/import/src/CircleReader.cpp ~L419-423
• Confirmed on HEAD commit: de7f4736dc4c4f5e47f72a4022a9aa9ac6d1ad1a (2026-04-21)

Root Cause

The overflow guard in CircleConst.cpp is written as:

if (r_buffer->offset() + r_buffer->size() > reader->file_size())
{
    assert(false);   // stripped under -DNDEBUG (Release)
    return nullptr;  // becomes unreachable dead code, eliminated by compiler
}
memcpy(t_data, f_data, r_buffer->size());  // always executed — OOB read

Under Release (-O3 -DNDEBUG, confirmed in infra/nncc/cmake/ApplyCompileFlags.cmake:7-8), the assert is removed and the return is dead code. The memcpy reads past the end of the file buffer.

Reproducer

Build poc_lead_b.cpp with ASAN:

clang++ -std=c++17 -fsanitize=address -DNDEBUG -O1 -g \
  -I/path/to/circle/schema_generated.h \
  -I/path/to/flatbuffers/include \
  poc_lead_b.cpp -o poc_lead_b_asan
ASAN_OPTIONS=detect_leaks=0 ./poc_lead_b_asan

ASAN Output

[*] buf_offset=2, buf_size=999, file_size=1000
[*] NDEBUG: assert stripped, return dead — falling through to memcpy!
==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x619000000968
READ of size 999 at 0x619000000968 thread T0
    #0 in __asan_memcpy
    #1 in main poc_lead_b.cpp:111
0x619000000968 is located 0 bytes after 1000-byte region [0x619000000580,0x619000000968)
SUMMARY: AddressSanitizer: heap-buffer-overflow poc_lead_b.cpp:111 in main

Impact

Any process loading an untrusted .circle file (inference pipelines, circle2circle, circle-verify) is affected. The flatbuffers VerifyModelBuffer() verifier passes for the malicious file. A crafted file with Buffer.offset=2, Buffer.size > file_size-2 triggers the read.

• Information disclosure: heap memory beyond the file buffer may contain sensitive runtime data
• Denial of service: reliable crash