Bug 1951188 (CVE-2021-29492)

Summary:	CVE-2021-29492 envoyproxy/envoy: HTTP request with escaped slash characters can bypass Envoy's authorization mechanisms
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:	askrabec, jwendell, kconner, rcernich, security-response-team, twalsh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	Envoy 1.17.3, Envoy 1.16.4, Envoy 1.15.5, Envoy 1.14.8	Doc Type:	If docs needed, set a value
Doc Text:	An authorization bypass vulnerability was found in envoyproxy/envoy. An attacker can potentially craft an HTTP request that defines a certain pattern of escaped characters in the URI path (such as %2F, %2f, %5C or %5c), allowing them to bypass the envoy authorization service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-05-12 02:33:51 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:	1951189, 1958387

Description Pedro Sampaio 2021-04-19 18:40:18 UTC

Envoy through 1.17.3 contains a remotely exploitable vulnerability where an HTTP request with escaped slash characters can bypass Envoy's authorization mechanisms.

Comment 2 Mark Cooper 2021-04-21 05:01:02 UTC

Acknowledgments:

Name: the Envoy security team

Comment 3 Pedro Sampaio 2021-05-10 12:55:37 UTC

*** Bug 1958384 has been marked as a duplicate of this bug. ***

Comment 5 errata-xmlrpc 2021-05-11 23:28:40 UTC

This issue has been addressed in the following products:

  OpenShift Service Mesh 2.0

Via RHSA-2021:1538 https://access.redhat.com/errata/RHSA-2021:1538

Comment 6 errata-xmlrpc 2021-05-11 23:29:25 UTC

This issue has been addressed in the following products:

  OpenShift Service Mesh 1.1

Via RHSA-2021:1540 https://access.redhat.com/errata/RHSA-2021:1540

Comment 7 Mark Cooper 2021-05-12 01:28:33 UTC

Upstream fix: https://github.com/envoyproxy/envoy/commit/5333b928d8bcffa26ab19bf018369a835f697585

Comment 8 Mark Cooper 2021-05-12 01:28:37 UTC

External References:

https://istio.io/latest/news/releases/1.9.x/announcing-1.9.5/

Comment 9 Product Security DevOps Team 2021-05-12 02:33:51 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-2021-29492