CVE-2020-11767: Information Exposure

April 15, 2020 (updated July 21, 2021)

Istio has a data-leak issue. If there is a TCP connection (negotiated with SNI over HTTPS) to *.example.com, a request for a domain concurrently configured explicitly (e.g., abc.example.com) is sent to the server(s) listening behind *.example.com. The outcome should instead be Misdirected Request. Imagine a shared caching forward proxy re-using an HTTP/2 connection for a large subnet with many users.

References

bugs.chromium.org/p/chromium/issues/detail?id=954160
nvd.nist.gov/vuln/detail/CVE-2020-11767

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