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Summary

DS-1094
Nonce-Disrespecting Adversaries: Practical Forgery Attacks on GCM in TLS
External Dataset
External Data Source
Internet-Wide Scan Data Repository
Unknown
Unknown
55 (lowest rank is 55)

Category & Restrictions

Other
cyber attack, cyber crime, application layer security
Unrestricted
Unknown

Description


We investigate nonce reuse issues with the GCM block cipher mode as used in TLS and focus in particular on AES-GCM, the most widely deployed variant.

With an Internet-wide scan we identified 184 HTTPS servers repeating nonces, which fully breaks the authenticity of the connections. Affected servers include large corporations, financial institutions, and a credit card company. We present a proof of concept of our attack allowing to violate the authenticity of affected HTTPS connections which in turn can be utilized to inject seemingly valid content into encrypted sessions. Furthermore, we discovered over 70,000 HTTPS servers using random nonces, which puts them at risk of nonce reuse, in the unlikely case that large amounts of data are sent via the same session. Fingerprints are SHA256 not SHA-1 as indicated. ; azet@azet.org

Additional Details

N/A
false
false
cybercrime, server, communication protocol, cryptographic protocol, application layer protocols, transport layer security, external data source, servers, digital signature forgery, internet protocol, data protection, cryptosystem, nonce-disrespecting adversaries: practical forgery attacks on gcm in tls, uniform resource identifier, cryptographic nonce, ciphertext, block cipher, hypertext transfer protocol, cryptographic primitives, inferlink corporation, internet security, 1094, cyberwarfare, secure communication, history of computing, cyberattack