Bug 1698025 (CVE-2019-9901) - CVE-2019-9901 istio/envoy: Path traversal via URL Patch manipulation in HTTP/1.x header
Summary: CVE-2019-9901 istio/envoy: Path traversal via URL Patch manipulation in HTTP/...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2019-9901
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks: 1698026
TreeView+ depends on / blocked
 
Reported: 2019-04-09 13:08 UTC by Pedro Sampaio
Modified: 2021-02-16 22:07 UTC (History)
4 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in Envoy version 1.9.0 and older, where Envoy does not normalize HTTP URL paths. This flaw allows a remote attacker to craft a path with a relative path and to bypass access control. This issue results in a backend server with the ability to interpret the unnormalized path.
Clone Of:
Environment:
Last Closed: 2020-03-13 04:31:46 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:0741 0 None None None 2019-04-10 20:29:13 UTC

Description Pedro Sampaio 2019-04-09 13:08:30 UTC 
A flaw was found in Envoy 1.9.0 and older. Envoy does not normalize HTTP URL paths. A remote attacker may craft a path with a relative path, e.g. something/../admin, to bypass access control, e.g. a block on /admin. A backend server could then interpret the unnormalized path and provide an attacker access beyond the scope provided for by the access control policy.

Upstream issue:

https://github.com/envoyproxy/envoy/issues/6435

References:

https://istio.io/blog/2019/announcing-1.1.2/
Comment 1 Pedro Sampaio 2019-04-09 13:08:33 UTC 
Acknowledgments:

Name: the Envoy security team
Comment 3 errata-xmlrpc 2019-04-10 20:29:13 UTC 
This issue has been addressed in the following products:

  OpenShift Service Mesh Tech Preview

Via RHSA-2019:0741 https://access.redhat.com/errata/RHSA-2019:0741
Comment 4 Product Security DevOps Team 2020-03-13 04:31:46 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-9901
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