Skip to content

Count Me If You Can: Enumerating QUIC Servers Behind Load Balancers

Author: Thimmaraju, K., & Scheuermann, B.
Published in: NetSys ’21: Conference on Networked Systems / Electronic Communications of the EASST, 80
Year: 2021
Type: Academic articles
DOI: http://dx.doi.org/10.14279/tuj.eceasst.80.1172

QUIC is a new transport protocol over UDP which is recently became an IETF RFC. Our security analysis of the Connection ID mechanism in QUIC reveals that the protocol is underspecified. This allows an attacker to count the number of server instances behind a middlebox, e.g., a load balancer. We found 4/15 (~25%) implementations vulnerable to our enumeration attack. We then concretely describe how an attacker can count the number of instances behind a load balancer that either uses Round Robin or Hashing.

Visit publication

Publication

Connected HIIG researchers

Björn Scheuermann, Prof. Dr.

Associated Research Director


  • Open Access
  • Peer Reviewed

Explore current HIIG Activities

Research issues in focus

HIIG is currently working on exciting topics. Learn more about our interdisciplinary pioneering work in public discourse.