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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(Red Hat Issues Fix) ntp Multiple Bugs Let Remote or Local Users Cause the Target Service to Crash
SecurityTracker Alert ID:  1039660
SecurityTracker URL:  http://securitytracker.com/id/1039660
CVE Reference:   CVE-2017-6462, CVE-2017-6463, CVE-2017-6464   (Links to External Site)
Date:  Oct 26 2017
Impact:   Denial of service via local system, Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2.8p9 and prior
Description:   Multiple vulnerabilities were reported in ntp. A remote or local user can cause the target service to crash.

A remote authenticated user can set a specially crafted configuration directive to cause the target ntpd service to crash [CVE-2017-6464].

A local user that can load a specially crafted '/dev/datum/' device can trigger a buffer overflow in datum_pts_receive() in the legacy Datum Programmable Time Server refclock driver and cause denial of service conditions [CVE-2017-6462].

A remote authenticated user can send a specially crafted ':config' directive to trigger a segmentation fault on the target NTP server [CVE-2017-6463].

A local user can cause DLLs to be executed with elevated privileges and cause denial of service conditions on Windows-based systems [CVE-2017-6455].

A local user can supply specially crafted command line parameters to trigger a stack overflow in addSourceToRegistry() on Windows-based systems [CVE-2017-6452].

A remote user can cause a data structure to be terminated incorrectly on Windows-based systems [CVE-2017-6459].

A remote user can send specially crafted data to trigger an overflow in the ctl_put() function and cause the target service to crash [CVE-2017-6458].

A remote user may be able to trigger an out-of-bounds memory write error in mx4200_send() on systems with the legacy MX4200 refclock enabled and cause the target service to crash [CVE-2017-6451].

A remote ntpd server can trigger a stack buffer overflow in ntpq when return a restriction list to cause the target ntpq service to crash [CVE-2017-6460].

A remote user that can spoof servers can exploit a timestamp origin check flaw and cause timestamp reset replies to be dropped [CVE-2016-9042].

Cure53 and Matthew Van Gundy of Cisco ASIG reported these vulnerabilities.

Impact:   A remote or local user can cause the target service to crash.
Solution:   Red Hat has issued a fix for CVE-2017-6462, CVE-2017-6463, and CVE-2017-6464.

The Red Hat advisory is available at:

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

Vendor URL:  access.redhat.com/errata/RHSA-2017:3071 (Links to External Site)
Cause:   Access control error, Boundary error, Input validation error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Mar 24 2017 ntp Multiple Bugs Let Remote or Local Users Cause the Target Service to Crash



 Source Message Contents

Subject:  [RHSA-2017:3071-01] Moderate: ntp security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: ntp security update
Advisory ID:       RHSA-2017:3071-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:3071
Issue date:        2017-10-26
CVE Names:         CVE-2017-6462 CVE-2017-6463 CVE-2017-6464 
=====================================================================

1. Summary:

An update for ntp is now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having a security impact
of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available for each vulnerability from
the CVE link(s) in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - noarch, x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, noarch, x86_64

3. Description:

The Network Time Protocol (NTP) is used to synchronize a computer's time
with another referenced time source. These packages include the ntpd
service which continuously adjusts system time and utilities used to query
and configure the ntpd service.

Security Fix(es):

* Two vulnerabilities were discovered in the NTP server's parsing of
configuration directives. A remote, authenticated attacker could cause ntpd
to crash by sending a crafted message. (CVE-2017-6463, CVE-2017-6464)

* 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. (CVE-2017-6462)

Red Hat would like to thank the NTP project for reporting these issues.
Upstream acknowledges Cure53 as the original reporter of these issues.

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

https://access.redhat.com/articles/11258

After installing this update, the ntpd daemon will restart automatically.

5. Bugs fixed (https://bugzilla.redhat.com/):

1433987 - CVE-2017-6464 ntp: Denial of Service via Malformed Config
1433995 - CVE-2017-6462 ntp: Buffer Overflow in DPTS Clock
1434002 - CVE-2017-6463 ntp: Authenticated DoS via Malicious Config Option

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ntp-4.2.6p5-12.el6_9.1.src.rpm

i386:
ntp-4.2.6p5-12.el6_9.1.i686.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.i686.rpm
ntpdate-4.2.6p5-12.el6_9.1.i686.rpm

x86_64:
ntp-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntpdate-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
ntp-debuginfo-4.2.6p5-12.el6_9.1.i686.rpm
ntp-perl-4.2.6p5-12.el6_9.1.i686.rpm

noarch:
ntp-doc-4.2.6p5-12.el6_9.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-perl-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ntp-4.2.6p5-12.el6_9.1.src.rpm

x86_64:
ntp-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntpdate-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

noarch:
ntp-doc-4.2.6p5-12.el6_9.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-perl-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ntp-4.2.6p5-12.el6_9.1.src.rpm

i386:
ntp-4.2.6p5-12.el6_9.1.i686.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.i686.rpm
ntpdate-4.2.6p5-12.el6_9.1.i686.rpm

ppc64:
ntp-4.2.6p5-12.el6_9.1.ppc64.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.ppc64.rpm
ntpdate-4.2.6p5-12.el6_9.1.ppc64.rpm

s390x:
ntp-4.2.6p5-12.el6_9.1.s390x.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.s390x.rpm
ntpdate-4.2.6p5-12.el6_9.1.s390x.rpm

x86_64:
ntp-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntpdate-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

i386:
ntp-debuginfo-4.2.6p5-12.el6_9.1.i686.rpm
ntp-perl-4.2.6p5-12.el6_9.1.i686.rpm

noarch:
ntp-doc-4.2.6p5-12.el6_9.1.noarch.rpm

ppc64:
ntp-debuginfo-4.2.6p5-12.el6_9.1.ppc64.rpm
ntp-perl-4.2.6p5-12.el6_9.1.ppc64.rpm

s390x:
ntp-debuginfo-4.2.6p5-12.el6_9.1.s390x.rpm
ntp-perl-4.2.6p5-12.el6_9.1.s390x.rpm

x86_64:
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-perl-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ntp-4.2.6p5-12.el6_9.1.src.rpm

i386:
ntp-4.2.6p5-12.el6_9.1.i686.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.i686.rpm
ntpdate-4.2.6p5-12.el6_9.1.i686.rpm

x86_64:
ntp-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntpdate-4.2.6p5-12.el6_9.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

i386:
ntp-debuginfo-4.2.6p5-12.el6_9.1.i686.rpm
ntp-perl-4.2.6p5-12.el6_9.1.i686.rpm

noarch:
ntp-doc-4.2.6p5-12.el6_9.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-12.el6_9.1.x86_64.rpm
ntp-perl-4.2.6p5-12.el6_9.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2017-6462
https://access.redhat.com/security/cve/CVE-2017-6463
https://access.redhat.com/security/cve/CVE-2017-6464
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2017 Red Hat, Inc.
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