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Category:   Application (Generic)  >   ntp Vendors:   ntp.org
(Red Hat Issues Fix) NTP Signature Validation Flaw Lets Remote Users Bypass Validation Checks
SecurityTracker Alert ID:  1021647
SecurityTracker URL:  http://securitytracker.com/id/1021647
CVE Reference:   CVE-2009-0021   (Links to External Site)
Date:  Jan 29 2009
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2.4p5 (production) and prior versions; 4.2.5p150 (development) and prior versions
Description:   A vulnerability was reported in NTP. A remote user can bypass digital signature validation.

The software does not properly check the results of the OpenSSL EVP_VerifyFinal() function. As a result, a remote server can supply a specially crafted invalid signature on a certificate that will be detected as a valid certificate. Signature checks on DSA and ECDSA keys used with SSL/TLS are affected.

Clients that connect to servers using RSA keys are not affected.

Client certificate validation is not affected.

Impact:   A remote user can bypass certificate validation.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-0046.html

Vendor URL:  www.ntp.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  4, 5

Message History:   This archive entry is a follow-up to the message listed below.
Jan 7 2009 NTP Signature Validation Flaw Lets Remote Users Bypass Validation Checks



 Source Message Contents

Subject:  [RHSA-2009:0046-01] Moderate: ntp security update


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

Synopsis:          Moderate: ntp security update
Advisory ID:       RHSA-2009:0046-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.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
http://kbase.redhat.com/faq/docs/DOC-11259

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:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/ntp-4.2.0.a.20040617-8.el4_7.1.src.rpm

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:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/ntp-4.2.0.a.20040617-8.el4_7.1.src.rpm

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:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/ntp-4.2.0.a.20040617-8.el4_7.1.src.rpm

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:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/ntp-4.2.0.a.20040617-8.el4_7.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/ntp-4.2.2p1-9.el5_3.1.src.rpm

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:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/ntp-4.2.2p1-9.el5_3.1.src.rpm

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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0021
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2009 Red Hat, Inc.
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