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CentOS ProjectNTP_ADVISORY2.ASC

HistoryFeb 10, 2015 - 12:06 p.m.

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

2015-02-1012:06:45

CentOS Project

aix.software.ibm.com

383

7.5 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:P/I:P/A:P

0.966 High

EPSS

Percentile

99.6%

JSON

IBM SECURITY ADVISORY

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.asc
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.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-2014-9293 CVSS=5.0
CVE-2014-9294 CVSS=5.0
CVE-2014-9295 CVSS=7.5

Reboot required? NO
Workarounds? Yes

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

I. DESCRIPTION

CVE-2014-9293
If no authentication key is defined in the ntp.conf file, a cryptographically-weak
default key is generated.

CVE-2014-9294
ntp-keygen before 4.2.7p230 uses a non-cryptographic random number generator 
with a weak seed to generate symmetric keys.

CVE-2014-9295
A remote unauthenticated attacker may craft special packets that trigger buffer
overflow.

II. CVSS

CVE-2014-9293
CVSS Base Score: 5.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/99576
CVSS Environmental Score*: Undefined
CVSS String: AV:N/AC:L/Au:N/C:N/I:P/A:N

| CVE-2014-9294
CVSS Base Score: 5.0
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/99577
CVSS Environmental Score*: Undefined
CVSS String: AV:N/AC:L/Au:N/C:N/I:P/A:N

CVE-2014-9295
CVSS Base Score: 7.5
CVSS Temporal Score: See http://xforce.iss.net/xforce/xfdb/99578
CVSS Environmental Score*: Undefined
CVSS String: AV:N/AC:L/Au:N/C:P/I:P/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 6.1.8.0 6.1.8.19 key_w_fs
bos.net.tcp.client 6.1.9.0 6.1.9.30 key_w_fs
| bos.net.tcp.client 7.1.2.0 7.1.2.19 key_w_fs
bos.net.tcp.client 7.1.3.0 7.1.3.30 key_w_fs

AIX Fileset (VIOS)  Lower Level         Upper Level
---------------------------------------------------------

| bos.net.tcp.client 6.1.8.0(2.2.2.0) 6.1.8.19(2.2.2.6)
bos.net.tcp.client 6.1.9.0(2.2.3.0) 6.1.9.30(2.2.3.4)

NTPv4:

AIX Fileset         Lower Level   Upper Level   KEY
--------------------------------------------------------
ntp.rte             6.1.6.0       6.1.6.2       key_w_fs
ntp.rte             7.1.0.0       7.1.0.2       key_w_fs

AIX Fileset (VIOS)  Lower Level         Upper Level
--------------------------------------------------------

| ntp.rte 6.1.6.0(2.2.2.0) 6.1.6.2(2.2.2.6)
| ntp.rte 6.1.6.0(2.2.3.0) 6.1.6.2(2.2.3.4)

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

Note: To use the following commands on VIOS you must first execute:

oem_setup_env

To determine if NTPv3 on your system is vulnerable, execute the following command:

lslpp -L bos.net.tcp.client

To determine if NTPv4 on your system is vulnerable, execute the following command:
     
lslpp -L ntp.rte

NOTE: NTPv4 exists on AIX release version 6.1 and 7.1 only.

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           IV68427         NOW (ifix-only)   key_w_apar
    6.1.8            IV68426         09/30/2015 SP7    key_w_apar
    6.1.9            IV68428         05/29/2015 SP5    key_w_apar

| 7.1.2 IV68429 09/30/2015 SP7 key_w_apar
7.1.3 IV68430 05/29/2015 SP5 key_w_apar

    VIOS Level       APAR number     Availability
    ---------------------------------------------------
    2.2.2            IV68426         09/30/2015 2.2.2.7
    2.2.3            IV68428         05/29/2015 2.2.3.5

    Subscribe to the APARs here:

    http://www.ibm.com/support/docview.wss?uid=isg1IV68427
    http://www.ibm.com/support/docview.wss?uid=isg1IV68426
    http://www.ibm.com/support/docview.wss?uid=isg1IV68428
    http://www.ibm.com/support/docview.wss?uid=isg1IV68429
    http://www.ibm.com/support/docview.wss?uid=isg1IV68430

    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.

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

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_fix2.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    IV68427m9a.150203.epkg.Z     key_w_fix
    6.1.8.5     IV68426m5b.150204.epkg.Z     key_w_fix
    6.1.9.4     IV68428s4a.150109.epkg.Z     key_w_fix
    7.1.2.5     IV68429m5b.150204.epkg.Z     key_w_fix
    7.1.3.4     IV68430s4a.150109.epkg.Z     key_w_fix

    VIOS Level  Interim Fix (*.Z)
    ------------------------------------
    2.2.2.5     IV68426m5b.150204.epkg.Z
    2.2.3.4     IV68428s4a.150109.epkg.Z

    To extract the fixes from the tar file:
    tar xvf ntp_fix2.tar 
    cd ntp_ifix2

    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
    ----------------------------------------------------------------------------------------------------
    0938352f46368612abf5e932184995c65a25239f9b2a0dbe1702964a58a96cbe IV68427m9a.150203.epkg.Z key_w_csum
    6b6da091ace27bcccfa1988bb089d56f69f2044fdb60431972f17639a51218db IV68426m5b.150204.epkg.Z key_w_csum
    32e398506a9ed51265ce8014a7903032d545d0ce0c928a25347df7f136b44225 IV68428s4a.150109.epkg.Z key_w_csum
    09ac275b942bfb4baf1515ee70c601aaf5156439180c272cb0aa9f73e00c91db IV68429m5b.150204.epkg.Z key_w_csum
    76305e0993443ed212ac752c6d29323d222f2de574afd61d60aa227376107296 IV68430s4a.150109.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 &lt;pubkey_file&gt; -signature &lt;ifix_file&gt;.sig &lt;ifix_file&gt;

    openssl dgst -sha1 -verify &lt;pubkey_file&gt; -signature &lt;advisory_file&gt;.sig &lt;advisory_file&gt;

    Published advisory OpenSSL signature file location:

    http://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.asc.sig
    https://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.asc.sig
    ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.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
    ===============================================

    NTP4 Install images v6.1.6.3 for AIX 6.1 ntp4-6.1.6.3.tar

    To extract the fixes from the tar file 
    tar -xvf ntp4-6.1.6.3.tar

    To preview the fix installation:

    cd ntp4-6.1.6.3
    installp -apYd . ntp

    To install the fix package:

    cd ntp4-6.1.6.3
    installp -aXYd . ntp

    Now to use NTPv4 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
    ===============================================

    NTP4 Install images v7.1.0.3 for AIX 7.1 ntp4-7.1.0.3.tar

    To extract the fixes from the tar file  
				
    tar xvf ntp4-7.1.0.3.tar

    To preview the fix installation:

    cd ntp4-7.1.0.3
    installp -apYd . ntp

    To install the fix package:

    cd ntp4-7.1.0.3
    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

    Put restrict ... noquery in your ntp.conf file, for non-trusted senders.

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-2014-9293: https://vulners.com/cve/CVE-2014-9293
CVE-2014-9294: https://vulners.com/cve/CVE-2014-9294
CVE-2014-9295: https://vulners.com/cve/CVE-2014-9295

*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.