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AUSCERT External Security Bulletin Redistribution
ESB-2015.0341
Network Time Protocol (NTP) vulnerability in AIX
11 February 2015
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Network Time Protocol (NTP)
Publisher: IBM
Operating System: AIX
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2014-9295 CVE-2014-9294 CVE-2014-9293
Reference: ASB-2015.0003
ASB-2014.0145
ESB-2015.0207
ESB-2015.0141
ESB-2015.0029
ESB-2015.0008
ESB-2015.0006
ESB-2014.2519
ESB-2014.2497
ESB-2014.2476
ESB-2014.2473
ESB-2014.2472
Original Bulletin:
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory2.asc
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IBM SECURITY ADVISORY
First Issued: Tue Feb 10 12:06:45 CST 2015
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-2013-5211 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-2014-9293
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 6.1.8.18 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 7.1.2.18 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) 6.1.8.18(2.2.2.5)
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(2.2.2.5)
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 SP6 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
security-alert@austin.ibm.com 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_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:
security-alert@austin.ibm.com
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:
security-alert@austin.ibm.com
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: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-5211
CVE-2014-9294: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-9294
CVE-2014-9295: http://cve.mitre.org/cgi-bin/cvename.cgi?name=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.
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