Network Time Protocol (NTP) vulnerability in AIX,Network Time Protocol (NTP) vulnerability in VIOS

IBM SECURITY ADVISORY

First Issued: Thu Jun 12 16:24:51 CDT 2014
Updated: Tue Jul 1 12:35:38 CDT 2014
Update: Corrected public key URL.
Updated: Wed Jul 2 15:20:29 CDT 2014
Update: Added published advisory OpenSSL signature file.
Updated: Thu Jul 3 07:42:49 CDT 2014
Update: Renamed tar file for TNC compliancy
|Updated: Mon Jul 7 14:26:45 CDT 2014
|Update: Corrected APAR Availability

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc

===============================================================================
VULNERABILITY SUMMARY

VULNERABILITY: Network Time Protocol (NTP) vulnerability in AIX

PLATFORMS: AIX 5.3, 6.1 and 7.1 releases
VIOS 2.2.*

SOLUTION: Apply the fix as described below.

THREAT: See below

CVE Numbers: CVE-2013-5211 CVSS=5.0

Reboot required? NO
Workarounds? YES

===============================================================================
DETAILED INFORMATION

I. DESCRIPTION

The monlist feature in ntpd in NTP allows remote attackers to
cause a denial of service (traffic amplification) via forged
(1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests.

II. CVSS

CVSS Base Score: 5.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/90143 for the current score
CVSS Environmental Score*: Undefined
CVSS String: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

III. PLATFORM VULNERABILITY ASSESSMENT

The following fileset levels are vulnerable:

NTPv3:

AIX Fileset         Lower Level  Upper Level   KEY
-------------------------------------------------------
bos.net.tcp.client  5.3.12.0     5.3.12.10     key_w_fs
bos.net.tcp.client  6.1.7.0      6.1.7.20      key_w_fs
bos.net.tcp.client  6.1.8.0      6.1.8.17      key_w_fs
bos.net.tcp.client  6.1.9.0      6.1.9.1       key_w_fs 
bos.net.tcp.client  7.1.1.0      7.1.1.20      key_w_fs
bos.net.tcp.client  7.1.2.0      7.1.2.17      key_w_fs
bos.net.tcp.client  7.1.3.0      7.1.3.2       key_w_fs

AIX Fileset (VIOS)  Lower Level         Upper Level
---------------------------------------------------------
bos.net.tcp.client  6.1.7.0(2.2.1.0)    6.1.7.20(2.2.1.8)
bos.net.tcp.client  6.1.8.0(2.2.2.0)    6.1.8.17(2.2.2.4)
bos.net.tcp.client  6.1.9.0(2.2.3.0)    6.1.9.1 (2.2.3.2)

NTPv4:

AIX Fileset         Lower Level   Upper Level   KEY
--------------------------------------------------------
ntp.rte             6.1.6.0       6.1.6.1       key_w_fs
ntp.rte             7.1.0.0       7.1.0.1       key_w_fs

AIX Fileset (VIOS)  Lower Level         Upper Level
--------------------------------------------------------
ntp.rte             6.1.6.0(2.2.1.0)    6.1.6.1(2.2.1.8)
ntp.rte             6.1.6.0(2.2.2.0)    6.1.6.1(2.2.2.4)
ntp.rte             6.1.6.0(2.2.3.0)    6.1.6.1(2.2.3.2)

NOTE: To find out whether the affected filesets are installed on your
systems, refer to the lslpp command found in AIX user's guide.

IV. SOLUTIONS

A. APARS

    IBM has assigned the following APARs to the problem:

    NOTE: APARs are only applicable to NTPv3. For NTPv4 refer to steps mentioned
    in FIXES section under NTPv4 heading below.

    AIX Level        APAR number     Availability      KEY
    -------------------------------------------------------------

| 5.3.12 IV59636 NOW (ifix-only) key_w_apar
| 6.1.8 IV58068 12/31/2014 SP6 key_w_apar
| 6.1.9 IV56213 10/24/2014 SP4 key_w_apar
| 7.1.2 IV55365 12/31/2014 SP6 key_w_apar
| 7.1.3 IV56324 10/24/2014 SP4 key_w_apar

    VIOS Level       APAR number     Availability
    ---------------------------------------------------

| 2.2.2 IV58068 12/31/2014 2.2.2.5
| 2.2.3 IV56213 10/24/2014 2.2.3.4

    Subscribe to the APARs here:

    http://www.ibm.com/support/docview.wss?uid=isg1IV59636
    http://www.ibm.com/support/docview.wss?uid=isg1IV58068
    http://www.ibm.com/support/docview.wss?uid=isg1IV56213
    http://www.ibm.com/support/docview.wss?uid=isg1IV55365
    http://www.ibm.com/support/docview.wss?uid=isg1IV56324

    By subscribing, you will receive periodic email alerting you
    to the status of the APAR, and a link to download the fix once
    it becomes available.

B. FIXES

    NTPv3 (Network Time Protocol Version 3)
    =======================================

    Fixes for NTPv3 are available.  The fixes can be downloaded via ftp
    from:

    ftp://aix.software.ibm.com/aix/efixes/security/ntp_fix.tar

    The link above is to a tar file containing this signed
    advisory, fix packages, and OpenSSL signatures for each package.
    The fixes below include prerequisite checking. This will
    enforce the correct mapping between the fixes and AIX
    Technology Levels.

    AIX Level   Interim Fix (*.Z)            KEY
    --------------------------------------------------
    5.3.12.9    IV59636s9a.140423.epkg.Z     key_w_fix
    6.1.7.9     IV58413s9a.140421.epkg.Z     key_w_fix
    6.1.8.4     IV58068s4a.140421.epkg.Z     key_w_fix
    6.1.9.2     IV56213s1a.140421.epkg.Z     key_w_fix
    7.1.1.9     IV56575s9a.140421.epkg.Z     key_w_fix
    7.1.2.4     IV55365s4a.140421.epkg.Z     key_w_fix
    7.1.3.2     IV56324s2a.140522.epkg.Z     key_w_fix

    VIOS Level  Interim Fix (*.Z)
    ------------------------------------
    2.2.1.8     IV58413s9a.140421.epkg.Z
    2.2.2.4     IV58068s4a.140421.epkg.Z
    2.2.3.2     IV56213s1a.140421.epkg.Z

    To extract the fixes from the tar file:
    tar xvf ntp_fix.tar 
    cd ntp_ifix

    Verify you have retrieved the fixes intact:

    The checksums below were generated using the
    "openssl dgst -sha256 file" command as the followng:

    openssl dgst -sha256                                             filename                 KEY
    ----------------------------------------------------------------------------------------------------
    ed2aa3b4f2076fd24808e20ef32ff7ee70d2c0ff39092954045ef7163b80541a IV59636s9a.140423.epkg.Z key_w_csum
    a319f02951cbb95a028f75de2548df53c8ad159383b67df5264f8c25fc202cc5 IV58413s9a.140421.epkg.Z key_w_csum
    3cdd922dae20c9ffab304badbbe6f8fd893bc057515ecc860aa5afca8867261f IV58068s4a.140421.epkg.Z key_w_csum
    014f4cf77b7c3dd0ad94191211da197c6be5b900224db1ec25f5b5bf3506f690 IV56213s1a.140421.epkg.Z key_w_csum
    4de291d684a6eec060398086637d0fe7441aaa2e84618313d4662f2ed564a879 IV56575s9a.140421.epkg.Z key_w_csum
    649feede9f57aa537b09f350cddbcc1d7a16b782a935bc7a5b4ffbd47bce7fb3 IV55365s4a.140421.epkg.Z key_w_csum
    8ec8d0ed64d21642a9d95e43545daca1d9ac910730ee351a3d01fbd5d30c8acd IV56324s2a.140522.epkg.Z key_w_csum

    These sums should match exactly. The OpenSSL signatures in the tar
    file and on this advisory can also be used to verify the
    integrity of the fixes.  If the sums or signatures cannot be
    confirmed, contact IBM AIX Security at
    [email protected] and describe the discrepancy.

    openssl dgst -sha1 -verify <pubkey_file> -signature <ifix_file>.sig <ifix_file>

    openssl dgst -sha1 -verify <pubkey_file> -signature <advisory_file>.sig <advisory_file>

    Published advisory OpenSSL signature file location:

    http://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc.sig
    https://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc.sig
    ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc.sig


    NTPv4 (Network Time Protocol Version 4)
    =======================================

    A fix is available, and it can be downloaded from:

    https://www14.software.ibm.com/webapp/iwm/web/reg/download.do?source=aixbp&lang=en_US&S_PKG=NTPv4&cp=UTF-8

C. FIX AND INTERIM FIX INSTALLATION

    IMPORTANT: If possible, it is recommended that a mksysb backup
    of the system be created.  Verify it is both bootable and
    readable before proceeding.

    NTPv3 (Network Time Protocol Version 3)
    =======================================

    To preview a fix installation:

    installp -a -d fix_name -p all  # where fix_name is the name of the
                                    # fix package being previewed.
    To install a fix package:

    installp -a -d fix_name -X all  # where fix_name is the name of the
                                    # fix package being installed.

    Interim fixes have had limited functional and regression
    testing but not the full regression testing that takes place
    for Service Packs; however, IBM does fully support them.

    Interim fix management documentation can be found at:

    http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html

    To preview an interim fix installation:

    emgr -e ipkg_name -p         # where ipkg_name is the name of the
                                 # interim fix package being previewed.

    To install an interim fix package:

    emgr -e ipkg_name -X         # where ipkg_name is the name of the
                                 # interim fix package being installed.

    NTPv4 (Network Time Protocol Version 4) AIX 6.1
    ===============================================

    NTPv4 Install images v6.1.6.2 for AIX 6.1 ntp4-6.1.6.2.tar

	To extract the fixes from the tar file 
	tar -xvf ntp4-6.1.6.2.tar

    To preview the fix installation:

    cd ntp4-6.1.6.2
    installp -apYd . ntp

    To install the fix package:

    cd ntp4-6.1.6.2
    installp -aXYd . ntp

    For NTPv4 use on AIX 6.1, please follow steps in link 

    http://publib.boulder.ibm.com/infocenter/aix/v6r1/topic/com.ibm.aix.files/doc/aixfiles/ntp.htm?resultof=%22%6e%74%70%34%22%20

    IMPORTANT: The fix will not take affect until any running xntpd
    servers have been stopped and restarted with the following
    commands:

    stopsrc -s xntpd
    startsrc -s xntpd

    NTPv4 (Network Time Protocol Version 4) AIX 7.1
    ===============================================

    NTPv4 Install images v7.1.0.2 for AIX 7.1 ntp4-7.1.0.2.tar

    To extract the fixes from the tar file  
				
	tar -xvf ntp4-7.1.0.2.tar

    To preview the fix installation:

    cd ntp4-7.1.0.2
    installp -apYd . ntp

    To install the fix package:

    cd ntp4-7.1.0.2
    installp -aXYd . ntp
    
    For NTPv4 use on AIX 7.1, please follow steps in link 

    http://publib.boulder.ibm.com/infocenter/aix/v7r1/topic/com.ibm.aix.files/doc/aixfiles/ntp.htm?resultof=%22%6e%74%70%34%22%20

    IMPORTANT: The fix will not take affect until any running xntpd
    servers have been stopped and restarted with the following
    commands:

    stopsrc -s xntpd
    startsrc -s xntpd

V. WORKAROUNDS

Use noquery in your default restrictions to block all status queries.

Or

Use disable monitor to disable the ntpdc -c monlist command while still 
allowing other status queries.  

VI. CONTACT INFORMATION

If you would like to receive AIX Security Advisories via email,
please visit:

    http://www.ibm.com/systems/support

and click on the "My notifications" link.

To view previously issued advisories, please visit:

    http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq

Comments regarding the content of this announcement can be
directed to:

    [email protected]

To obtain the OpenSSL public key that can be used to verify the
signed advisories and ifixes:

    Download the key from our web page:

    http://www.ibm.com/systems/resources/systems_p_os_aix_security_pubkey.txt

To obtain the PGP public key that can be used to communicate
securely with the AIX Security Team you can either:

    A. Send an email with "get key" in the subject line to:

        [email protected]

    B. Download the key from a PGP Public Key Server. The key ID is:

        0x28BFAA12

Please contact your local IBM AIX support center for any assistance.

VII. ACKNOWLEDGMENTS:

IBM discovered and fixed this vulnerability as part of its
commitment to secure the AIX operating system.

VIII. REFERENCES:

Complete CVSS Guide: http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2: http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2
X-Force Vulnerability Database: http://xforce.iss.net/xforce/xfdb/
CVE-2013-5211: https://vulners.com/cve/CVE-2013-5211

*The CVSS Environment Score is customer environment specific and will
ultimately impact the Overall CVSS Score. Customers can evaluate the
impact of this vulnerability in their environments by accessing the links
in the Reference section of this Flash.

Note: According to the Forum of Incident Response and Security Teams
(FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry
open standard designed to convey vulnerability severity and help to
determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES
"AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE
RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY
VULNERABILITY.