CVE-2020-11767

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Summary

CVECVE-2020-11767
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-04-15 02:15:00 UTC
Updated2021-07-21 11:39:00 UTC
DescriptionIstio through 1.5.1 and Envoy through 1.14.1 have 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 421 Misdirected Request. Imagine a shared caching forward proxy re-using an HTTP/2 connection for a large subnet with many users. If a victim is interacting with abc.example.com, and a server (for abc.example.com) recycles the TCP connection to the forward proxy, the victim's browser may suddenly start sending sensitive data to a *.example.com server. This occurs because the forward proxy between the victim and the origin server reuses connections (which obeys the specification), but neither Istio nor Envoy corrects this by sending a 421 error. Similarly, this behavior voids the security model browsers have put in place between domains.

Risk And Classification

Problem Types: NVD-CWE-noinfo

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Envoyproxy Envoy All All All All
Application Istio Istio All All All All

References

ReferenceSourceLinkTags
Istio does not adhere to HTTP/2 RFC 7540 · Issue #13589 · istio/istio · GitHub MISC github.com Exploit, Third Party Advisory
954160 - chromium - An open-source project to help move the web forward. - Monorail MISC bugs.chromium.org Issue Tracking, Third Party Advisory
Envoy does not adhere to HTTP/2 RFC 7540 · Issue #6767 · envoyproxy/envoy · GitHub MISC github.com Third Party Advisory
404 NR when using browser on multiple ingress gateways · Issue #9429 · istio/istio · GitHub MISC github.com Third Party Advisory
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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