Bug 1698025 (CVE-2019-9901)

Summary:	CVE-2019-9901 istio/envoy: Path traversal via URL Patch manipulation in HTTP/1.x header
Product:	[Other] Security Response	Reporter:	Pedro Sampaio <psampaio>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	bavery, kconner, mcooper, twalsh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-13 04:31:46 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1698026

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