Bug 1595690 (CVE-2018-1000518)

Summary:	CVE-2018-1000518 python-websockets: Improper handling of highly compressed data
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jujens
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	python-websockets 5	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-25 09:46:14 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:	1595691
Bug Blocks:

Description Andrej Nemec 2018-06-27 11:29:58 UTC

python-websockets version 4 contains a CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) vulnerability in Servers and clients, unless configured with compression=None that can result in Denial of Service by memory exhaustion. This attack appear to be exploitable via Sending a specially crafted frame on an established connection. This vulnerability appears to have been fixed in 5.

Upstream issue:

https://github.com/aaugustin/websockets/pull/407

Upstream patch:

https://github.com/aaugustin/websockets/pull/407/commits/5b96bdc9afbff9e9587be25a3af5933efbbafe1a

Comment 1 Andrej Nemec 2018-06-27 11:30:21 UTC

Created python-websockets tracking bugs for this issue:

Affects: fedora-28 [bug 1595691]