Bug 1450993 (CVE-2017-7478)

Summary:	CVE-2017-7478 openvpn: Unauthenticated DoS via large control packets
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	dazo, huzaifas, mauricio.teixeira, steve
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	openvpn 2.3.15, openvpn 2.4.2	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:12:38 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:	1451000, 1451001
Bug Blocks:

Description Adam Mariš 2017-05-15 14:20:08 UTC

Asserting on the length of received control packets can lead to unauthenticated denial of service when received control packet is too large.

This issue affects OpenVPN 2.3.12 and newer.

Upstream fixes:

openvpn 2.3: https://github.com/OpenVPN/openvpn/commit/feb35ee5ca
openvpn 2.4: https://github.com/OpenVPN/openvpn/commit/66b99a0753
master: https://github.com/OpenVPN/openvpn/commit/5774cf4c25e

External References:

https://community.openvpn.net/openvpn/wiki/QuarkslabAndCryptographyEngineerAudits

Comment 1 Adam Mariš 2017-05-15 14:20:23 UTC

Acknowledgments:

Name: the OpenVPN project
Upstream: QuarksLab

Comment 2 David Sommerseth 2017-05-15 14:27:49 UTC

Updated in Fedora/Fedora EPEL:

* F-24:  (in progress, will be updated to 2.3.15)
* F-25:  https://bodhi.fedoraproject.org/updates/FEDORA-2017-0d0f18140a
* F-26:  https://bodhi.fedoraproject.org/updates/FEDORA-2017-89d98779ec
* EL6:   https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-6ee18d1c7b
* EPEL7: https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2017-c9f915d837

Comment 3 Adam Mariš 2017-05-15 14:32:03 UTC

Created openvpn tracking bugs for this issue:

Affects: epel-all [bug 1451001]
Affects: fedora-all [bug 1451000]

Comment 4 Product Security DevOps Team 2019-06-08 03:12:38 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.