Bug 1433987 – CVE-2017-6464 ntp: Denial of Service via Malformed Config

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Bug 1433987 - (CVE-2017-6464) CVE-2017-6464 ntp: Denial of Service via Malformed Config

Summary:	CVE-2017-6464 ntp: Denial of Service via Malformed Config

Status:	CLOSED ERRATA

Aliases:	CVE-2017-6464

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:	http://bugs.ntp.org/show_bug.cgi?id=3389
Whiteboard:	impact=moderate,public=20170321,repor...
Keywords:	Security

Depends On:	1435163 1437714 1437715 1437716 1437717 1499184
Blocks:	1434021 1498774
	Show dependency tree / graph

Reported:	2017-03-20 09:55 EDT by Adam Mariš
Modified:	2018-07-20 02:09 EDT (History)
CC List:	17 users (show)

See Also:
Fixed In Version:	ntp 4.2.8p10, ntp 4.3.94
Doc Type:	If docs needed, set a value
Doc Text:	A vulnerability was discovered in the NTP server's parsing of configuration directives. A remote, authenticated attacker could cause ntpd to crash by sending a crafted message.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-10-26 03:10:28 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:3071	normal	SHIPPED_LIVE	Moderate: ntp security update	2017-10-26 07:03:10 EDT
Red Hat Product Errata	RHSA-2018:0855	None	None	None	2018-04-10 04:26 EDT

Groups: None (edit)

Description Adam Mariš 2017-03-20 09:55:36 EDT

A vulnerability found in the NTP server makes it possible for an authenticated remote user to crash ntpd via a malformed mode configuration directive.

Mitigation:

Properly monitor your ntpd instances, and auto-restart ntpd (without -g) if it stops running.

Comment 1 Adam Mariš 2017-03-20 09:55:42 EDT

Acknowledgments:

Name: the NTP project
Upstream: Cure53

Comment 5 Adam Mariš 2017-03-23 06:08:10 EDT

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1435163]

Comment 7 Doran Moppert 2017-03-30 01:53:44 EDT

In ntp-4.2.6p5 and ntp-4.2.4p8, the ttl value is an unsigned char (rather than uint32), limiting the OOB read to a (256-8)-byte region. Testing on x86_64 fails to cause a crash.

Different compiler or linker options, or different hardware, could still result in a crash being possible through this vector.

Comment 10 nupur priya 2017-04-27 03:38:40 EDT

Is RHEL-7 vulnerable to this?

Comment 18 errata-xmlrpc 2017-10-26 03:03:44 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:3071 https://access.redhat.com/errata/RHSA-2017:3071

Comment 19 errata-xmlrpc 2018-04-10 04:26:11 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2018:0855 https://access.redhat.com/errata/RHSA-2018:0855

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