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Sicherheit: Denial of Service in NTP
Aktuelle Meldungen Distributionen
Name: Denial of Service in NTP
ID: RHSA-2015:2520-01
Distribution: Red Hat
Plattformen: Red Hat Enterprise Linux
Datum: Do, 26. November 2015, 16:31
Referenzen: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-7704
Applikationen: NTP

Originalnachricht

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

Synopsis: Important: ntp security update
Advisory ID: RHSA-2015:2520-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-2520.html
Issue date: 2015-11-26
CVE Names: CVE-2015-7704
=====================================================================

1. Summary:

Updated ntp packages that fix one security issue are now available for Red
Hat Enterprise Linux 6.5 and 6.6 Extended Update Support.

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 Compute Node Optional EUS (v. 6.5) - noarch, x86_64
Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.6) - noarch, x86_64
Red Hat Enterprise Linux HPC Node EUS (v. 6.5) - x86_64
Red Hat Enterprise Linux HPC Node EUS (v. 6.6) - x86_64
Red Hat Enterprise Linux Server EUS (v. 6.5) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server EUS (v. 6.6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.5) - i386, noarch, ppc64,
s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.6) - i386, noarch, ppc64,
s390x, 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 timestamps
in Kiss-of-Death packets. A remote attacker could use this flaw to send a
crafted Kiss-of-Death packet to an ntpd client that would increase the
client's polling interval value, and effectively disable synchronization
with the server. (CVE-2015-7704)

Red Hat would like to thank Aanchal Malhotra, Isaac E. Cohen, and Sharon
Goldberg of Boston University for reporting this issue.

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/):

1271070 - CVE-2015-7704 ntp: disabling synchronization via crafted KoD packet

6. Package List:

Red Hat Enterprise Linux HPC Node EUS (v. 6.5):

Source:
ntp-4.2.6p5-2.el6_5.1.src.rpm

x86_64:
ntp-4.2.6p5-2.el6_5.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-2.el6_5.1.x86_64.rpm
ntpdate-4.2.6p5-2.el6_5.1.x86_64.rpm

Red Hat Enterprise Linux HPC Node EUS (v. 6.6):

Source:
ntp-4.2.6p5-3.el6_6.1.src.rpm

x86_64:
ntp-4.2.6p5-3.el6_6.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-3.el6_6.1.x86_64.rpm
ntpdate-4.2.6p5-3.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.5):

Source:
ntp-4.2.6p5-2.el6_5.1.src.rpm

noarch:
ntp-doc-4.2.6p5-2.el6_5.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-2.el6_5.1.x86_64.rpm
ntp-perl-4.2.6p5-2.el6_5.1.x86_64.rpm

Red Hat Enterprise Linux Compute Node Optional EUS (v. 6.6):

noarch:
ntp-doc-4.2.6p5-3.el6_6.1.noarch.rpm

x86_64:
ntp-debuginfo-4.2.6p5-3.el6_6.1.x86_64.rpm
ntp-perl-4.2.6p5-3.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.5):

Source:
ntp-4.2.6p5-2.el6_5.1.src.rpm

i386:
ntp-4.2.6p5-2.el6_5.1.i686.rpm
ntp-debuginfo-4.2.6p5-2.el6_5.1.i686.rpm
ntpdate-4.2.6p5-2.el6_5.1.i686.rpm

ppc64:
ntp-4.2.6p5-2.el6_5.1.ppc64.rpm
ntp-debuginfo-4.2.6p5-2.el6_5.1.ppc64.rpm
ntpdate-4.2.6p5-2.el6_5.1.ppc64.rpm

s390x:
ntp-4.2.6p5-2.el6_5.1.s390x.rpm
ntp-debuginfo-4.2.6p5-2.el6_5.1.s390x.rpm
ntpdate-4.2.6p5-2.el6_5.1.s390x.rpm

x86_64:
ntp-4.2.6p5-2.el6_5.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-2.el6_5.1.x86_64.rpm
ntpdate-4.2.6p5-2.el6_5.1.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.6):

Source:
ntp-4.2.6p5-3.el6_6.1.src.rpm

i386:
ntp-4.2.6p5-3.el6_6.1.i686.rpm
ntp-debuginfo-4.2.6p5-3.el6_6.1.i686.rpm
ntpdate-4.2.6p5-3.el6_6.1.i686.rpm

ppc64:
ntp-4.2.6p5-3.el6_6.1.ppc64.rpm
ntp-debuginfo-4.2.6p5-3.el6_6.1.ppc64.rpm
ntpdate-4.2.6p5-3.el6_6.1.ppc64.rpm

s390x:
ntp-4.2.6p5-3.el6_6.1.s390x.rpm
ntp-debuginfo-4.2.6p5-3.el6_6.1.s390x.rpm
ntpdate-4.2.6p5-3.el6_6.1.s390x.rpm

x86_64:
ntp-4.2.6p5-3.el6_6.1.x86_64.rpm
ntp-debuginfo-4.2.6p5-3.el6_6.1.x86_64.rpm
ntpdate-4.2.6p5-3.el6_6.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.5):

Source:
ntp-4.2.6p5-2.el6_5.1.src.rpm

i386:
ntp-debuginfo-4.2.6p5-2.el6_5.1.i686.rpm
ntp-perl-4.2.6p5-2.el6_5.1.i686.rpm

noarch:
ntp-doc-4.2.6p5-2.el6_5.1.noarch.rpm

ppc64:
ntp-debuginfo-4.2.6p5-2.el6_5.1.ppc64.rpm
ntp-perl-4.2.6p5-2.el6_5.1.ppc64.rpm

s390x:
ntp-debuginfo-4.2.6p5-2.el6_5.1.s390x.rpm
ntp-perl-4.2.6p5-2.el6_5.1.s390x.rpm

x86_64:
ntp-debuginfo-4.2.6p5-2.el6_5.1.x86_64.rpm
ntp-perl-4.2.6p5-2.el6_5.1.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.6):

i386:
ntp-debuginfo-4.2.6p5-3.el6_6.1.i686.rpm
ntp-perl-4.2.6p5-3.el6_6.1.i686.rpm

noarch:
ntp-doc-4.2.6p5-3.el6_6.1.noarch.rpm

ppc64:
ntp-debuginfo-4.2.6p5-3.el6_6.1.ppc64.rpm
ntp-perl-4.2.6p5-3.el6_6.1.ppc64.rpm

s390x:
ntp-debuginfo-4.2.6p5-3.el6_6.1.s390x.rpm
ntp-perl-4.2.6p5-3.el6_6.1.s390x.rpm

x86_64:
ntp-debuginfo-4.2.6p5-3.el6_6.1.x86_64.rpm
ntp-perl-4.2.6p5-3.el6_6.1.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-2015-7704
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 2015 Red Hat, Inc.
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