Off-path attacks against PKI

AutorDai, Tianxiang; Shulman, Haya; Waidner, Michael
Datum2018
ArtConference Paper
AbstraktThe security of Internet-based applications fundamentally relies on the trustwortiness of Certificate Authorities (CAs). We practically demonstrate for the first time that even a very weak attacker, namely, an off-path attacker, can effectively subvert the trustworthiness of popular commercially used CAs. We demonstrate an attack against a COMODO CA which uses Domain Validation (DV) for authenticating domain ownership. The attack exploits DNS Cache Poisoning and tricks the CA into issuing fraudulent certificates for domains the attacker does not legitimately own namely certificates binding the attackers public key to a victim domain. We set up a demonstration of a live attack at https://pki.cad.sit.fraunhofer.de.
KonferenzConference on Computer and Communications Security (CCS) <2018, Toronto>
ReferenzLie, D.: CCS 2018, ACM SIGSAC Conference on Computer and Communications Security. Proceedings: Toronto, Canada, October 15 - 19, 2018. New York: ACM, 2018, pp. 2213-2215
SchlüsselISBN : 9781450356930