An updated ntp package that fixes a security issue is now available for Red Hat Enterprise Linux 4 and 5. This update has been rated as having moderate security impact by the Red Hat Security Response Team.

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

Synopsis:          Moderate: ntp security update
Advisory ID:       RHSA-2009:1648-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2009:1648.html
Issue date:        2009-12-08
CVE Names:         CVE-2009-3563 
====================================================================
1. Summary:

An updated ntp package that fixes a security issue is now available for Red
Hat Enterprise Linux 4 and 5.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Description:

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

Robin Park and Dmitri Vinokurov discovered a flaw in the way ntpd handled
certain malformed NTP packets. ntpd logged information about all such
packets and replied with an NTP packet that was treated as malformed when
received by another ntpd. A remote attacker could use this flaw to create
an NTP packet reply loop between two ntpd servers via a malformed packet
with a spoofed source IP address and port, causing ntpd on those servers to
use excessive amounts of CPU time and fill disk space with log messages.
(CVE-2009-3563)

All ntp users are advised to upgrade to this updated package, which
contains 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 that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at

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

531213 - CVE-2009-3563 ntpd: DoS with mode 7 packets (VU#568372)

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_8.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.i386.rpm

ia64:
ntp-4.2.0.a.20040617-8.el4_8.1.ia64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.ia64.rpm

ppc:
ntp-4.2.0.a.20040617-8.el4_8.1.ppc.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.ppc.rpm

s390:
ntp-4.2.0.a.20040617-8.el4_8.1.s390.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.s390.rpm

s390x:
ntp-4.2.0.a.20040617-8.el4_8.1.s390x.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.s390x.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_8.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.i386.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_8.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.i386.rpm

ia64:
ntp-4.2.0.a.20040617-8.el4_8.1.ia64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.ia64.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_8.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.i386.rpm

ia64:
ntp-4.2.0.a.20040617-8.el4_8.1.ia64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.ia64.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_8.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:

i386:
ntp-4.2.2p1-9.el5_4.1.i386.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.i386.rpm

x86_64:
ntp-4.2.2p1-9.el5_4.1.x86_64.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:

i386:
ntp-4.2.2p1-9.el5_4.1.i386.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.i386.rpm

ia64:
ntp-4.2.2p1-9.el5_4.1.ia64.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.ia64.rpm

ppc:
ntp-4.2.2p1-9.el5_4.1.ppc.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.ppc.rpm

s390x:
ntp-4.2.2p1-9.el5_4.1.s390x.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.s390x.rpm

x86_64:
ntp-4.2.2p1-9.el5_4.1.x86_64.rpm
ntp-debuginfo-4.2.2p1-9.el5_4.1.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#package

7. References:

https://www.cve.org/CVERecord?id=CVE-2009-3563
https://access.redhat.com/security/updates/classification#moderate

8. Contact:

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

Copyright 2009 Red Hat, Inc.