DeepSec 2021 Talk: Web Cache Tunneling – Justin Ohneiser

Sanna/ August 31, 2021/ Conference

By using cache poisoning to store arbitrary data, we can use public web caches as open ephemeral storage to facilitate anonymous and evasive communication between network clients. We asked Justin a few more questions about his talk. Please tell us the top facts about your talk. Public web caches, when improperly configured, can be used as open ephemeral storage. Combined with a synchronization technique, this ephemeral storage can be used to tunnel arbitrary data between network clients. Tunneling data in this manner requires no listening service, as all endpoints behave as clients to the web cache server, allowing trivial use of anonymizing protocols. The conditions for this technique are present on several extremely popular websites, and the use of this technique by malware could make network detection nearly impossible. How did you come up

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