cve/2019/CVE-2019-9901.md

CVE-2019-9901

Description

Envoy 1.9.0 and before does not normalize HTTP URL paths. A remote attacker may craft a relative path, e.g., something/../admin, to bypass access control, e.g., a block on /admin. A backend server could then interpret the non-normalized path and provide an attacker access beyond the scope provided for by the access control policy.

POC

Reference

• https://github.com/envoyproxy/envoy/security/advisories/GHSA-xcx5-93pw-jw2w

Github

• https://github.com/alphaSeclab/sec-daily-2019
• https://github.com/solo-io/envoy-cves