1450997 – (CVE-2017-7479) CVE-2017-7479 openvpn: DoS due to exhaustion of packet-ID counter

Bug 1450997 (CVE-2017-7479) - CVE-2017-7479 openvpn: DoS due to exhaustion of packet-ID counter

Summary: CVE-2017-7479 openvpn: DoS due to exhaustion of packet-ID counter

Keywords:
Status:	CLOSED UPSTREAM
Alias:	CVE-2017-7479
Product:	Security Response
Classification:	Other
Component:	vulnerability
Sub Component:
Version:	unspecified
Hardware:	All
OS:	Linux
Priority:	medium
Severity:	medium
Target Milestone:	---
Assignee:	Red Hat Product Security
QA Contact:
Docs Contact:
URL:
Whiteboard:
Depends On:	1451000 1451001
Blocks:
TreeView+	depends on / blocked

Reported:	2017-05-15 14:27 UTC by Adam Mariš
Modified:	2019-09-29 14:12 UTC (History)
CC List:	4 users (show)
Fixed In Version:	openvpn 2.3.15, openvpn 2.4.2
Doc Type:	If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed:	2019-06-08 03:12:40 UTC

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Add an attachment (proposed patch, testcase, etc.)

Description Adam Mariš 2017-05-15 14:27:22 UTC

An authenticated client can cause the server's the packet-id counter to roll over, which would lead the server process to hit an ASSERT() and stop running.

Upstream fixes:

openvpn 2.3: https://github.com/OpenVPN/openvpn/commit/b727643cdf
openvpn 2.4: https://github.com/OpenVPN/openvpn/commit/591a4e574c
master: https://github.com/OpenVPN/openvpn/commit/e498cb0ea8

External References:

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

Comment 1 Adam Mariš 2017-05-15 14:27:38 UTC

Acknowledgments:

Name: the OpenVPN project
Upstream: QuarksLab

Comment 2 David Sommerseth 2017-05-15 14:28:38 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 14:32:16 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 03:12:40 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.

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