Updated ntp packages to correct a security issue are 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.

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

Synopsis:          Moderate: ntp security update
Advisory ID:       RHSA-2009:0046-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2009:0046.html
Issue date:        2009-01-29
CVE Names:         CVE-2009-0021 
====================================================================
1. Summary:

Updated ntp packages to correct a security issue are 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 AS version 4 - i386, ia64, ppc, s390, s390x, 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
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

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

A flaw was discovered in the way the ntpd daemon checked the return value
of the OpenSSL EVP_VerifyFinal function. On systems using NTPv4
authentication, this could lead to an incorrect verification of
cryptographic signatures, allowing time-spoofing attacks. (CVE-2009-0021)

Note: This issue only affects systems that have enabled NTP authentication.
By default, NTP authentication is not enabled.

All ntp users are advised to upgrade to the 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 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/):

476807 - CVE-2009-0021 ntp incorrectly checks for malformed signatures

6. Package List:

Red Hat Enterprise Linux AS version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_7.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.i386.rpm

ia64:
ntp-4.2.0.a.20040617-8.el4_7.1.ia64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.ia64.rpm

ppc:
ntp-4.2.0.a.20040617-8.el4_7.1.ppc.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.ppc.rpm

s390:
ntp-4.2.0.a.20040617-8.el4_7.1.s390.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.s390.rpm

s390x:
ntp-4.2.0.a.20040617-8.el4_7.1.s390x.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.s390x.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_7.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.i386.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_7.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.i386.rpm

ia64:
ntp-4.2.0.a.20040617-8.el4_7.1.ia64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.ia64.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:

i386:
ntp-4.2.0.a.20040617-8.el4_7.1.i386.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.i386.rpm

ia64:
ntp-4.2.0.a.20040617-8.el4_7.1.ia64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.ia64.rpm

x86_64:
ntp-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm
ntp-debuginfo-4.2.0.a.20040617-8.el4_7.1.x86_64.rpm

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

Source:

i386:
ntp-4.2.2p1-9.el5_3.1.i386.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.i386.rpm

x86_64:
ntp-4.2.2p1-9.el5_3.1.x86_64.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:

i386:
ntp-4.2.2p1-9.el5_3.1.i386.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.i386.rpm

ia64:
ntp-4.2.2p1-9.el5_3.1.ia64.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.ia64.rpm

ppc:
ntp-4.2.2p1-9.el5_3.1.ppc.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.ppc.rpm

s390x:
ntp-4.2.2p1-9.el5_3.1.s390x.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.s390x.rpm

x86_64:
ntp-4.2.2p1-9.el5_3.1.x86_64.rpm
ntp-debuginfo-4.2.2p1-9.el5_3.1.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-2009-0021
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.
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