Bug 1918265 (CVE-2020-36048)

Summary:	CVE-2020-36048 yarnpkg-socket.io/engine.io: allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	bdettelb, mcooper, osoukup, tomckay
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	engine.io 4.0.0	Doc Type:	If docs needed, set a value
Doc Text:	An uncontrolled resource consumption vulnerability was found in engine.io. If an attacker crafts a packet with a very large payload length or crafts many small packets, this can cause the engine.io to consume an ever increasing amount of memory and/or CPU, resulting in a denial of service. The highest threat from this vulnerability is to system availability.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-28 01:43:48 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:	1918267

Description Marian Rehak 2021-01-20 11:07:52 UTC

Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.

Reference:

https://github.com/bcaller/kill-engine-io
https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b

Comment 1 Mark Cooper 2021-01-27 07:43:24 UTC

Based off the description:
"This change reduces the default value from 100 mb to a more sane 1 mb.

This helps protect the server against denial of service attacks by
malicious clients sending huge amounts of data."

Changing our impact to Important as engine.io can be used in the server sense, and this would constituent as a remote DoS - worst case.

Leaving Quay affects as Low, as these look like dev dependencies to me but want to confirm with engineering first. 

$ npm list --prod | grep engine

Comment 2 Mark Cooper 2021-01-27 07:43:27 UTC

External References:

https://snyk.io/vuln/SNYK-JS-ENGINEIO-1056749

Comment 4 Mark Cooper 2021-01-27 08:22:47 UTC

Upstream fix: https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b

Comment 6 Jason Shepherd 2021-03-31 20:32:36 UTC

Statement:

Red Hat Quay uses engine.io as a dependency of karma. Karma and therefore engine.io are only used at build time, and not during runtime, making this vulnerability low impact for Red Hat Quay.