hacnho/protobuf-logdescriptor-labels-dos-poc

Protocol Buffers LogDescriptor labels materialization DoS PoC

This repository contains a benign security research PoC for a protobuf binary artifact that drives large repeated-message materialization during google.api.log_pb2.LogDescriptor.ParseFromString(...).

Files:

• control_one_description.pb
• malicious_labels_5000000.pb
• reproduce.py

Observed behavior:

• control artifact:
  • parses successfully with zero labels
  • description_len = 9999995
• malicious artifact:
  • both files are 10,000,000 bytes
  • parses successfully with 5,000,000 labels entries
  • increases peak RSS by about 330336 kB in local clean-process replay
  • increases peak RSS by 330272 kB in unauthenticated public replay

Tested runtime:

• protobuf==7.35.1
• Python: /usr/bin/python3

Public files:

• https://huggingface.co/hacnho/protobuf-logdescriptor-labels-dos-poc/resolve/main/control_one_description.pb
• https://huggingface.co/hacnho/protobuf-logdescriptor-labels-dos-poc/resolve/main/malicious_labels_5000000.pb
• https://huggingface.co/hacnho/protobuf-logdescriptor-labels-dos-poc/resolve/main/reproduce.py
• repo sha: 09ee2bd4827f4cea75e28d4b430edda43b4bc3c0

Reproduction:

python3 reproduce.py