CVE-2021-39156: Incorrect Authorization

August 24, 2021 (updated November 7, 2023)

Istio is an open source platform for providing a uniform way to integrate microservices, manage traffic flow across microservices, enforce policies and aggregate telemetry data. Istio contains a remotely exploitable vulnerability where an HTTP request with #fragment in the path may bypass Istio’s URI path based authorization policies. As a work around a Lua filter may be written to normalize the path.

References

istio.io/latest/news/security/istio-security-2021-008
nvd.nist.gov/vuln/detail/CVE-2021-39156

Code Behaviors & Features

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