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HOLÍKOVÁ, L. HOLÍK, L. HOMOLIAK, I. LENGÁL, O. VEANES, M. VOJNAR, T.
Originální název
Counting in Regexes Considered Harmful: Exposing ReDoS Vulnerability of Nonbacktracking Matchers
Typ
článek ve sborníku ve WoS nebo Scopus
Jazyk
angličtina
Originální abstrakt
In this paper, we study the performance characteristics of nonbacktracking regex matchers and their vulnerability against ReDoS (regular expression denial of service) attacks. We focus on their known Achilles heel, which are extended regexes that use bounded quantifiers (e.g., (ab){100}). We propose a method for generating input texts that can cause ReDoS attacks on these matchers. The method exploits the bounded repetition and uses it to force expensive simulations of the deterministic automaton for the regex. We perform an extensive experimental evaluation of our and other state-of-the-art ReDoS generators on a large set of practical regexes with a comprehensive set of backtracking and nonbacktracking matchers, as well as experiments where we demonstrate ReDoS attacks on state-of-the-art real-world security applications containing SNORT with Hyperscan and the HW-accelerated regex matching engine on the NVIDIA BlueField-2 card. Our experiments show that bounded repetition is indeed a notable weakness of nonbacktracking matchers, with our generator being the only one capable of significantly increasing their running time.
Klíčová slova
redos, counting automata, DFA, regex, denial of service, pattern matching
Autoři
HOLÍKOVÁ, L.; HOLÍK, L.; HOMOLIAK, I.; LENGÁL, O.; VEANES, M.; VOJNAR, T.
Vydáno
10. 8. 2022
Nakladatel
USENIX
Místo
Boston, MA
ISBN
978-1-939133-31-1
Kniha
Proceedings of the 31st USENIX Security Symposium
Strany od
4165
Strany do
4182
Strany počet
18
URL
https://www.usenix.org/conference/usenixsecurity22/presentation/turonova
BibTex
@inproceedings{BUT178146, author="Lenka {Holíková} and Lukáš {Holík} and Ivan {Homoliak} and Ondřej {Lengál} and Margus {Veanes} and Tomáš {Vojnar}", title="Counting in Regexes Considered Harmful: Exposing ReDoS Vulnerability of Nonbacktracking Matchers", booktitle="Proceedings of the 31st USENIX Security Symposium", year="2022", pages="4165--4182", publisher="USENIX", address="Boston, MA", isbn="978-1-939133-31-1", url="https://www.usenix.org/conference/usenixsecurity22/presentation/turonova" }