S. Basso (Open Observatory of Network Interference)

We designed DNSCheck, an active network experiment to detect the blocking of DoT/DoH services. We implemented DNSCheck into OONI Probe, the network-interference measurement tool we develop since 2012. We compiled a list of popular DoT/DoH services and ran DNSCheck measurements with help from volunteer OONI Probe users. We present preliminary results from measurements in Kazakhstan (AS48716), Iran (AS197207), and China (AS45090). We tested 123 DoT/DoH services, corresponding to 461 TCP/QUIC endpoints. We found endpoints to fail or succeed consistently. In AS197207 (Iran), 50% of the DoT endpoints seem blocked. Otherwise, we found that more than 80% of the tested endpoints were always reachable. The most frequently blocked services are Cloudflare’s and Google’s. In most cases, attempting to reach blocked endpoints failed with a timeout. We observed timeouts connecting, during, and after the TLS handshake. TLS blocking depends on either the SNI or the destination endpoint.

View More Papers

JMPscare: Introspection for Binary-Only Fuzzing

Dominik Maier, Lukas Seidel (TU Berlin)

Read More

WINNIE : Fuzzing Windows Applications with Harness Synthesis and...

Jinho Jung (Georgia Institute of Technology), Stephen Tong (Georgia Institute of Technology), Hong Hu (Pennsylvania State University), Jungwon Lim (Georgia Institute of Technology), Yonghwi Jin (Georgia Institute of Technology), Taesoo Kim (Georgia Institute of Technology)

Read More

A First Look at Scams on YouTube

Elijah Bouma-Sims, Bradley Reaves (North Carolina State University)

Read More

Detecting Tor Bridge from Sampled Traffic in Backbone Networks

Hua Wu (School of Cyber Science & Engineering and Key Laboratory of Computer Network and Information Integration Southeast University, Ministry of Education, Jiangsu Nanjing, Purple Mountain Laboratories for Network and Communication Security (Nanjing, Jiangsu)), Shuyi Guo, Guang Cheng, Xiaoyan Hu (School of Cyber Science & Engineering and Key Laboratory of Computer Network and Information Integration…

Read More