In short
- CVE-2021-39156 is a HIGH (CVSS 7.5) vulnerability affecting istio.io/istio, istio (istio).
- Chance of exploitation in the next 30 days (EPSS): 1.2%, higher than 67.3% of all vulnerabilities.
- Fix: update to 1.10.4, 1.11.1, 1.9.8, 1.10.3 or later.
| Package | Affected versions | Patched versions |
|---|
| istio.io/istio Go | ≥ 1.10.0, < 1.10.4≥ 1.11.0, < 1.11.1< 1.9.8
| 1.10.41.11.11.9.8
|
| istio | ≥ 1.10.0, < 1.10.3≥ 1.11.0, < 1.11.1< 1.9.8
| 1.10.31.11.11.9.8
|
Description
Impact
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 Istio’s URI path based authorization policies.
Patches
- Istio 1.11.1 and above
- Istio 1.10.4 and above
- Istio 1.9.8 and above
Workarounds
A Lua filter may be written to normalize the path. This is similar to the Path normalization presented in the Security Best Practices guide.
References
More details can be found in the Istio Security Bulletin
For more information
If you have any questions or comments about this advisory, please email us at [email protected]
NVD description
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 Istio’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.
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