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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(Red Hat Issues Fix) ntp Multiple Flaws Let Remote Users Spoof Messages, Obtain Potentially Sensitive Information, and Deny Service
SecurityTracker Alert ID:  1034803
SecurityTracker URL:  http://securitytracker.com/id/1034803
CVE Reference:   CVE-2015-8138   (Links to External Site)
Date:  Jan 25 2016
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 4.2.8p6
Description:   Multiple vulnerabilities were reported in ntp. A remote user can cause denial of service conditions on the target system. A remote user can obtain potentially sensitive information on the target system. A remote user can impersonate ntp peers.

A remote user can conduct a replay attack against authenticated broadcast mode packets [CVE-2015-7973].

A remote authenticated user can exploit a key check flaw to impersonate a peer [CVE-2015-7974].

A remote user can send specially crafted data to trigger a buffer overflow in the nextvar() function in ntpq and cause the target service to crash [CVE-2015-7975].

A remote authenticated user can send an ntpq saveconfig command with specially crafted filename characters to cause unintended results [CVE-2015-7976].

A remote user can send a specially crafted ntpdc reslist command to trigger a null pointer dereference and cause the target service to crash [CVE-2015-7977].

A remote user can send a specially crafted reslist command to consume all available stack memory [CVE-2015-7978].

A remote user can send a specially crafted broadcast mode packet to cause the target broadcast client to tear down the association with the broadcast server [CVE-2015-7979].

A remote server can send a specially crafted packet with an origin timestamp of zero to bypass the timestamp validation check in certain cases [CVE-2015-8138].

A remote user can send specially crafted data to trigger an infinite loop in ntpq [CVE-2015-8158].

A remote user can trigger an origin leak in ntpq and ntpdc to obtain potentially sensitive information [CVE-2015-8139].

A remote user on the local network may be able to conduct replay attacks against ntpq [CVE-2015-8140].

Cisco ASIG reported these vulnerabilities.

Impact:   A remote user can cause denial of service conditions.

A remote user can obtain potentially sensitive information on the target system.

A remote authenticated user can impersonate an ntp peer.

Solution:   Red Hat has issued a fix for CVE-2015-8138.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-0063.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0063.html (Links to External Site)
Cause:   Access control error, Authentication error, Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6, 7

Message History:   This archive entry is a follow-up to the message listed below.
Jan 22 2016 ntp Multiple Flaws Let Remote Users Spoof Messages, Obtain Potentially Sensitive Information, and Deny Service



 Source Message Contents

Subject:  [RHSA-2016:0063-01] Important: ntp security update

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

Synopsis:          Important: ntp security update
Advisory ID:       RHSA-2016:0063-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0063.html
Issue date:        2016-01-25
CVE Names:         CVE-2015-8138 
=====================================================================

1. Summary:

Updated ntp packages that fix one security issue are now available for Red
Hat Enterprise Linux 6 and 7.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - noarch, x86_64
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 (v. 7) - ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - noarch, x86_64

3. Description:

The Network Time Protocol (NTP) is used to synchronize a computer's time
with a referenced time source.

It was discovered that ntpd as a client did not correctly check the
originate timestamp in received packets. A remote attacker could use this
flaw to send a crafted packet to an ntpd client that would effectively
disable synchronization with the server, or push arbitrary offset/delay
measurements to modify the time on the client. (CVE-2015-8138)

All ntp users are advised to upgrade to these updated packages, which
contain a backported patch to resolve this issue. After installing the
update, the ntpd daemon will restart automatically.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

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

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

1299442 - CVE-2015-8138 ntp: missing check for zero originate timestamp

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ntp-4.2.6p5-5.el6_7.4.src.rpm

i386:
ntp-4.2.6p5-5.el6_7.4.i686.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.i686.rpm
ntpdate-4.2.6p5-5.el6_7.4.i686.rpm

x86_64:
ntp-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntpdate-4.2.6p5-5.el6_7.4.x86_64.rpm

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

i386:
ntp-debuginfo-4.2.6p5-5.el6_7.4.i686.rpm
ntp-perl-4.2.6p5-5.el6_7.4.i686.rpm

noarch:
ntp-doc-4.2.6p5-5.el6_7.4.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-perl-4.2.6p5-5.el6_7.4.x86_64.rpm

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

Source:
ntp-4.2.6p5-5.el6_7.4.src.rpm

x86_64:
ntp-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntpdate-4.2.6p5-5.el6_7.4.x86_64.rpm

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

noarch:
ntp-doc-4.2.6p5-5.el6_7.4.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-perl-4.2.6p5-5.el6_7.4.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ntp-4.2.6p5-5.el6_7.4.src.rpm

i386:
ntp-4.2.6p5-5.el6_7.4.i686.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.i686.rpm
ntpdate-4.2.6p5-5.el6_7.4.i686.rpm

ppc64:
ntp-4.2.6p5-5.el6_7.4.ppc64.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.ppc64.rpm
ntpdate-4.2.6p5-5.el6_7.4.ppc64.rpm

s390x:
ntp-4.2.6p5-5.el6_7.4.s390x.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.s390x.rpm
ntpdate-4.2.6p5-5.el6_7.4.s390x.rpm

x86_64:
ntp-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntpdate-4.2.6p5-5.el6_7.4.x86_64.rpm

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

i386:
ntp-debuginfo-4.2.6p5-5.el6_7.4.i686.rpm
ntp-perl-4.2.6p5-5.el6_7.4.i686.rpm

noarch:
ntp-doc-4.2.6p5-5.el6_7.4.noarch.rpm

ppc64:
ntp-debuginfo-4.2.6p5-5.el6_7.4.ppc64.rpm
ntp-perl-4.2.6p5-5.el6_7.4.ppc64.rpm

s390x:
ntp-debuginfo-4.2.6p5-5.el6_7.4.s390x.rpm
ntp-perl-4.2.6p5-5.el6_7.4.s390x.rpm

x86_64:
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-perl-4.2.6p5-5.el6_7.4.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ntp-4.2.6p5-5.el6_7.4.src.rpm

i386:
ntp-4.2.6p5-5.el6_7.4.i686.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.i686.rpm
ntpdate-4.2.6p5-5.el6_7.4.i686.rpm

x86_64:
ntp-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntpdate-4.2.6p5-5.el6_7.4.x86_64.rpm

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

i386:
ntp-debuginfo-4.2.6p5-5.el6_7.4.i686.rpm
ntp-perl-4.2.6p5-5.el6_7.4.i686.rpm

noarch:
ntp-doc-4.2.6p5-5.el6_7.4.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-5.el6_7.4.x86_64.rpm
ntp-perl-4.2.6p5-5.el6_7.4.x86_64.rpm

Red Hat Enterprise Linux Client (v. 7):

Source:
ntp-4.2.6p5-22.el7_2.1.src.rpm

x86_64:
ntp-4.2.6p5-22.el7_2.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
ntpdate-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

noarch:
ntp-doc-4.2.6p5-22.el7_2.1.noarch.rpm
ntp-perl-4.2.6p5-22.el7_2.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
sntp-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
ntp-4.2.6p5-22.el7_2.1.src.rpm

x86_64:
ntp-4.2.6p5-22.el7_2.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
ntpdate-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

noarch:
ntp-doc-4.2.6p5-22.el7_2.1.noarch.rpm
ntp-perl-4.2.6p5-22.el7_2.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
sntp-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
ntp-4.2.6p5-22.el7_2.1.src.rpm

ppc64:
ntp-4.2.6p5-22.el7_2.1.ppc64.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.ppc64.rpm
ntpdate-4.2.6p5-22.el7_2.1.ppc64.rpm

ppc64le:
ntp-4.2.6p5-22.el7_2.1.ppc64le.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.ppc64le.rpm
ntpdate-4.2.6p5-22.el7_2.1.ppc64le.rpm

s390x:
ntp-4.2.6p5-22.el7_2.1.s390x.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.s390x.rpm
ntpdate-4.2.6p5-22.el7_2.1.s390x.rpm

x86_64:
ntp-4.2.6p5-22.el7_2.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
ntpdate-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

noarch:
ntp-doc-4.2.6p5-22.el7_2.1.noarch.rpm
ntp-perl-4.2.6p5-22.el7_2.1.noarch.rpm

ppc64:
ntp-debuginfo-4.2.6p5-22.el7_2.1.ppc64.rpm
sntp-4.2.6p5-22.el7_2.1.ppc64.rpm

ppc64le:
ntp-debuginfo-4.2.6p5-22.el7_2.1.ppc64le.rpm
sntp-4.2.6p5-22.el7_2.1.ppc64le.rpm

s390x:
ntp-debuginfo-4.2.6p5-22.el7_2.1.s390x.rpm
sntp-4.2.6p5-22.el7_2.1.s390x.rpm

x86_64:
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
sntp-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
ntp-4.2.6p5-22.el7_2.1.src.rpm

x86_64:
ntp-4.2.6p5-22.el7_2.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
ntpdate-4.2.6p5-22.el7_2.1.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

noarch:
ntp-doc-4.2.6p5-22.el7_2.1.noarch.rpm
ntp-perl-4.2.6p5-22.el7_2.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-22.el7_2.1.x86_64.rpm
sntp-4.2.6p5-22.el7_2.1.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-2015-8138
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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