That thing to help protect internet traffic from hijacking? It's broken
"[W]e show that a combination of Stalloris with just a single iteration of low rate off-path packet loss attack suffices to remove the RPKI validation," the researchers explain in their paper."The idea behind our Stalloris attack is to create a deep delegation path so that the relying party [validating ROAs for the victim] opens RRDP connections to multiple publication points controlled by the adversary.
With the relying party of AS1 and the publication point of AS2 known, the attacker then prevents the relying party from communicating with the RKPI repository of AS2. This has to be done repeatedly so cached records to be removed from the DNS resolvers' cache. Using low rate bursts synchronized with queries from the relying party to find RPKI publication points, the attacker can effectively take RPKI protection out of the picture, forcing the target network to make routing decisions based on unvalidated information.
"In our measurements we found 47 percent of the publication points to be vulnerable to rate-limiting downgrade attacks," the paper says."This corresponds to 60 percent of the RPKI protected IPv4 address space in the Internet."
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