Bug 1753576 (CVE-2019-15226)

Summary:	CVE-2019-15226 envoy: crafted request allows remote attacker to cause denial of service
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	bavery, rcernich, security-response-team, twalsh
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
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Clone Of:		Environment:
Last Closed:	2021-10-27 10:48:39 UTC	Type:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1753581

Description Dhananjay Arunesh 2019-09-19 10:55:58 UTC

A vulnerability was found in Envoy, where Envoy 1.11.0 and 1.11.1 will iterate over existing request headers to verify that the total size of the headers stays below a maximum limit. The implementation in affected versions had O(n^2) performance characteristics. A remote attacker may craft a request that stays below the maximum request header size but consists of many thousands of small headers to consume CPU and result in a denial-of-service attack.

Comment 1 Timothy Walsh 2019-09-20 06:09:48 UTC

Acknowledgments:

Name: the Envoy security team

Comment 7 msiddiqu 2019-10-10 06:43:08 UTC

Upstream issue: 

https://github.com/envoyproxy/envoy/issues/8520

Comment 8 msiddiqu 2019-10-10 06:43:30 UTC

Upstream commit:

https://github.com/envoyproxy/envoy/commit/afc39bea36fd436e54262f150c009e8d72db5014
https://github.com/envoyproxy/envoy/commits/master