Bug 1433995 – CVE-2017-6462 ntp: Buffer Overflow in DPTS Clock

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Bug 1433995 - (CVE-2017-6462) CVE-2017-6462 ntp: Buffer Overflow in DPTS Clock

Summary:	CVE-2017-6462 ntp: Buffer Overflow in DPTS Clock

Status:	CLOSED ERRATA

Aliases:	CVE-2017-6462

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

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

URL:	http://bugs.ntp.org/show_bug.cgi?id=3388
Whiteboard:	impact=low,public=20170321,reported=2...
Keywords:	Security

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

Reported:	2017-03-20 10:01 EDT by Adam Mariš
Modified:	2018-07-20 02:11 EDT (History)
CC List:	14 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 found in NTP, in the parsing of packets from the /dev/datum device. A malicious device could send crafted messages, causing ntpd to crash.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2017-10-26 03:10:45 EDT
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-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 10:01:26 EDT

There is a potential for a buffer overflow in the legacy Datum Programmable Time Server refclock driver.  Here the packets are processed from the /dev/datum device and handled in datum_pts_receive().  Since an attacker would be required to somehow control a malicious /dev/datum device, this does not appear to be a practical attack and renders this issue "Low" in terms of severity.

Affects: All versions of NTP, up to but not including ntp-4.2.8p10, and ntp-4.3.0 up to, but not including ntp-4.3.94.

Mitigation:

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

Comment 1 Adam Mariš 2017-03-20 10:01:32 EDT

Acknowledgments:

Name: the NTP project
Upstream: Cure53

Comment 4 Adam Mariš 2017-03-23 06:08:20 EDT

Created ntp tracking bugs for this issue:

Affects: fedora-all [bug 1435163]

Comment 6 Karel Volný 2017-04-03 04:53:56 EDT

do we have a reproducer for this?

Comment 8 Kurt Seifried 2017-04-07 15:30:54 EDT

(In reply to Karel Volný from comment #6)
> do we have a reproducer for this?

We do not have a reproducer for this flaw, nor can I easily find one online, sorry.

Comment 15 errata-xmlrpc 2017-10-26 03:03:55 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 16 errata-xmlrpc 2018-04-10 04:26:32 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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