Bug 1176035 – CVE-2014-9294 ntp: ntp-keygen uses weak random number generator and seed when generating MD5 keys

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Bug 1176035 - (CVE-2014-9294) CVE-2014-9294 ntp: ntp-keygen uses weak random number generator and seed when generating MD5 keys

Summary:	CVE-2014-9294 ntp: ntp-keygen uses weak random number generator and seed when...

Status:	CLOSED ERRATA

Aliases:	CVE-2014-9294

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20141219,repor...
Keywords:	Security

Depends On:	1176067 1176068 1176069 1176070 1176100 1176191 1176680 1182167
Blocks:	1176041
	Show dependency tree / graph

Reported:	2014-12-19 03:56 EST by Huzaifa S. Sidhpurwala
Modified:	2015-11-25 05:23 EST (History)
CC List:	12 users (show)

See Also:
Fixed In Version:	ntp 4.2.8
Doc Type:	Bug Fix
Doc Text:	It was found that ntp-keygen used a weak method for generating MD5 keys. This could possibly allow an attacker to guess generated MD5 keys that could then be used to spoof an NTP client or server. Note: it is recommended to regenerate any MD5 keys that had explicitly been generated with ntp-keygen; the default installation does not contain such keys.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2014-12-19 21:46:51 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2014:2024	normal	SHIPPED_LIVE	Important: ntp security update	2014-12-20 02:40:29 EST
Red Hat Product Errata	RHSA-2014:2025	normal	SHIPPED_LIVE	Important: ntp security update	2014-12-20 00:43:37 EST
Red Hat Product Errata	RHSA-2015:0104	normal	SHIPPED_LIVE	Important: ntp security update	2015-01-28 18:52:05 EST

Groups: None (edit)

Description Huzaifa S. Sidhpurwala 2014-12-19 03:56:05 EST

As per upstream NTP security advisory:

Prior to ntp-4.2.7p230 ntp-keygen used a weak seed to prepare a random number generator that was of good quality back in the late 1990s. The random numbers produced was then used to generate symmetric keys. In ntp-4.2.8 we use a current-technology cryptographic random number generator, either RAND_bytes from OpenSSL, or arc4random(). 

Mitigation: Upgrade to 4.2.7p230 or later.

This vulnerability was discovered in ntp-4.2.6 by Stephen Roettger of the Google Security Team.

Comment 1 Tomas Hoger 2014-12-19 05:07:03 EST

Upstream change to the NEWS file with details quoted in comment 0:

http://bk1.ntp.org/ntp-dev/?PAGE=patch&REV=5493dc3dofY6drKJde9W-5O1M3s4eg

This seems to be the seeding fix applied between 4.2.7p229 and 4.2.7p230:

http://bk1.ntp.org/ntp-dev/util/ntp-keygen.c?PAGE=diffs&REV=4eae1b72298KRoBQmX-y8URCiRPH5g

Upstream bug:
http://bugs.ntp.org/show_bug.cgi?id=2666

There is another recent change in 4.2.8 which makes ntp use OpenSSL or arc4random for key generation:
http://bk1.ntp.org/ntp-dev/?PAGE=patch&REV=548db6ddlELn4rnqUZ4kKGOjvtXwbQ

Comment 7 Huzaifa S. Sidhpurwala 2014-12-19 09:12:56 EST

External References:

https://access.redhat.com/articles/1305723
http://support.ntp.org/bin/view/Main/SecurityNotice#non_cryptographic_random_number

Comment 8 Tomas Hoger 2014-12-19 11:21:45 EST

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1176191]

Comment 9 errata-xmlrpc 2014-12-19 19:44:23 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:2025 https://rhn.redhat.com/errata/RHSA-2014-2025.html

Comment 10 errata-xmlrpc 2014-12-19 21:40:38 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6
  Red Hat Enterprise Linux 7

Via RHSA-2014:2024 https://rhn.redhat.com/errata/RHSA-2014-2024.html

Comment 11 Fedora Update System 2014-12-21 21:37:31 EST

ntp-4.2.6p5-19.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 12 Fedora Update System 2014-12-23 13:28:37 EST

ntp-4.2.6p5-25.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 14 Fedora Update System 2014-12-31 14:00:30 EST

ntp-4.2.6p5-13.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 17 errata-xmlrpc 2015-01-28 13:52:32 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 EUS - Server and Compute Node Only

Via RHSA-2015:0104 https://rhn.redhat.com/errata/RHSA-2015-0104.html

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