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MTF-Storm: a high performance fuzzer for Modbus/TCP

MTF-Storm is a highly effective fuzzer for industrial systems employing Modbus/TCP connectivity. It achieves high fault coverage, while offering high performance and quick testing of the System-Under-Test (SUT). Analogously to its predecessor MTF, MTF-Storm operates in 3 phases: a) reconnaissance b) fuzz testing and failure detection. Reconnaissance identifies the memory organization of the SUT and the supported functionality, enabling selection and synthesis of fuzz testing sequences that are effective for the specific SUT. MTF-Storm develops its test sequences systematically, starting with single field tests and proceeding with combined field tests, adopting techniques for automated combinatorial software testing and reducing the test space through partitioning field value ranges. MTF-Storm has been used to evaluate 9 different Modbus/TCP implementations and has identified issues with all of them, ranging from out-of-spec responses to successful denial-of-service attacks and crashes. This is an image MTF-Storm[2] extends MTF [1] (cf https://github.com/artemiosv/etfa2015) introducing novel techniques and methods in the selection of values and the format alteration techniques. MTF-Storm adopts a systematic approach to exercise values of packet fields and format changes, in contrast to the random values and changes used by MTF.

Source code

Source code for Modbus/TCP fuzzer (MTF-Storm) used for ETFA 2018 paper [2]

Features

Informed fuzzer operating in three phases
Match reconnaissance findings and SUT capabilities. Systematic approach to values: (i) invalid values(ii) “interesting” values (iii) “non-interesting” values
Packet format alterations (Two or more ADU per TCP segment, appending sequences of “interesting”, “non-interesting” bytes to PDUs)
Support fuzzing every FC in spec (TCP and Serial)
Failure detection, log files (error and info), automatic evaluation

Installation and runing

File mtf_storm_instructions-en.txt (version python 2.7.3)
File mtf_storm_v_python3_instructions-en.txt (version python 3.9)

New version for python 3.x

Improvement reconnaissance phase
Heuristic pairwise selection for FC05, FC06 (address vs value,less pairwise)
Fix Nist file csv for FC15, FC16, FC23, FC20, FC21 (less pairwise)
In test suite format testing, in choice "attack byte" add categories "interesting byte" (e.g.diagnostics command)
Better structure to code (module and scripts)
User selection single test or pairwise test or all
and many more changes and improvements

Future work

Integration of a machine learning model that will automatically guide its phase fuzz testing

See work: [1] A.G. Voyiatzis, K. Katsigiannis and S. Koubias, “A Modbus/TCP Fuzzer for testing internetworked industrial systems.” In Proceedings of the 20th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA), Luxembourg, Sept. 8-11, 2015, pp. 1-6.

[2] Katsigiannis K, and Dimitrios Serpanos. "MTF-Storm: a high performance fuzzer for Modbus/TCP." 2018 IEEE 23rd International Conference on Emerging Technologies and Factory Automation (ETFA). Vol. 1. IEEE, 2018.

[3] Serpanos, Dimitrios, and Konstantinos Katsigiannis. "Fuzzing: Cyberphysical System Testing for Security and Dependability." Computer 54.9 (2021): 86-89.

Code compiled by K. Katsigiannis. For related questions please contact kkatsigiannis@upatras.gr or katsigiannis.kon@gmail.com