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Apache ORC dictionary_size uint32_t Overflow → Heap Buffer Overflow WRITE

Vulnerability

DictionaryLoader.cc:67 performs dictSize + 1 as uint32_t arithmetic. When dictionary_size = 0xFFFFFFFF (from protobuf ColumnEncoding), the result wraps to 0, causing resize(0). The RLE decoder then writes past the empty buffer at line 69 → heap-buffer-overflow WRITE.

Files

malicious_dictsize_overflow.orc — crafted ORC file (110 bytes)
craft_malicious_orc.py — Python script to generate the malicious file
harness.cc — C++ harness for reproduction

Reproduction

git clone https://github.com/apache/orc.git && cd orc
mkdir build && cd build
cmake .. -DCMAKE_BUILD_TYPE=Debug \
  -DCMAKE_C_FLAGS="-fsanitize=address -fno-omit-frame-pointer" \
  -DCMAKE_CXX_FLAGS="-fsanitize=address -fno-omit-frame-pointer" \
  -DCMAKE_EXE_LINKER_FLAGS="-fsanitize=address" \
  -DBUILD_JAVA=OFF -DBUILD_CPP_TESTS=OFF -DBUILD_TOOLS=ON \
  -DSTOP_BUILD_ON_WARNING=OFF
make -j$(nproc) orc-scan
./tools/src/orc-scan /path/to/malicious_dictsize_overflow.orc

Expected: ASAN heap-buffer-overflow WRITE at DictionaryLoader.cc:69

Downloads last month: 33

Total file size:

12 kB