Ecosyste.ms: Advisories

Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWhxeHctbW00NC1nYzRy

Istio Fragments in Path May Lead to Authorization Policy Bypass

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]

Permalink: https://github.com/advisories/GHSA-hqxw-mm44-gc4r
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWhxeHctbW00NC1nYzRy
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 2 years ago
Updated: over 1 year ago

CVSS Score: 8.1
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Identifiers: GHSA-hqxw-mm44-gc4r, CVE-2021-39156
References:

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

Repository: https://github.com/istio/istio
Blast Radius: 17.6

Affected Packages