CVE-2021-39156: Incorrect Authorization

August 30, 2021 (updated October 21, 2021)

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 1.11.0, 1.10.3 and below, and 1.9.7 and below contain a remotely exploitable vulnerability where an HTTP request with #fragment in the path may bypass Istioâ€™s URI path based authorization policies. Patches are available in Istio 1.11.1, Istio 1.10.4 and Istio 1.9.8. As a work around a Lua filter may be written to normalize the path.

References

github.com/advisories/GHSA-hqxw-mm44-gc4r
github.com/istio/istio/security/advisories/GHSA-hqxw-mm44-gc4r
istio.io/latest/news/security/istio-security-2021-008
nvd.nist.gov/vuln/detail/CVE-2021-39156

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