Security Bulletin
Summary
There are multiple vulnerabilities in NTPv3 and NTPv4 that affect AIX.
Vulnerability Details
NTPv3 is vulnerable to:
CVEID: CVE-2014-5209
DESCRIPTION: NTP could allow a remote attacker to obtain sensitive information. By sending a GET_RESTRICT control message, an attacker could exploit this vulnerability to obtain internal or alternative IP addresses and other sensitive information.
CVSS Base Score: 5.0
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/95841 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N)
NTPv3 and NTPv4 are vulnerable to:
CVEID: CVE-2018-7182
DESCRIPTION: NTP could allow a remote attacker to obtain sensitive information, caused by a leak in the ctl_getitem() function. By sending a specially crafted mode 6 packet, an attacker could exploit this vulnerability to read past the end of its buffer.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139785 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
CVEID: CVE-2018-7183
DESCRIPTION: NTP is vulnerable to a buffer overflow, caused by improper bounds checking by the decodearr function. By leveraging an ntpq query and sending a response with a crafted array, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash.
CVSS Base Score: 5.6
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/140092 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)
NTPv4 is vulnerable to:
CVEID: CVE-2018-7170
DESCRIPTION: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by a Sybil attack. By creating many ephemeral associations, an attacker could exploit this vulnerability to win the clock selection of ntpd and modify a victim's clock.
CVSS Base Score: 3.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139786 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N)
CVEID: CVE-2018-7184
DESCRIPTION: NTP is vulnerable to a denial of service, caused by the failure of the interleaved symmetric mode to recover from bad state. By sending specially crafted packets, a remote authenticated attacker could exploit this vulnerability to cause a denial of service.
CVSS Base Score: 3.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139784 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2018-7185
DESCRIPTION: NTP is vulnerable to a denial of service. By sending specially crafted packets, a remote authenticated attacker could exploit this vulnerability to reset authenticated interleaved association.
CVSS Base Score: 3.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139783 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L)
CVEID: CVE-2016-1549
DESCRIPTION: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by the failure to prevent Sybil attacks from authenticated peers. By creating multiple ephemeral associations to win the clock selection of ntpd, an attacker could exploit this vulnerability to modify a victim's clock.
CVSS Base Score: 5.3
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/112741 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N)
Affected Products and Versions
AIX 5.3, 6.1, 7.1, 7.2
VIOS 2.2.x
The vulnerabilities in the following filesets are being addressed:
key_fileset = aix
For NTPv3:
Fileset Lower Level Upper Level KEY PRODUCT(S)
---------------------------------------------------------------------
bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs NTPv3
bos.net.tcp.client 6.1.9.0 6.1.9.315 key_w_fs NTPv3
bos.net.tcp.client 7.1.4.0 7.1.4.33 key_w_fs NTPv3
bos.net.tcp.client 7.1.5.0 7.1.5.15 key_w_fs NTPv3
bos.net.tcp.ntpd 7.2.0.0 7.2.0.4 key_w_fs NTPv3
bos.net.tcp.ntpd 7.2.1.0 7.2.1.2 key_w_fs NTPv3
bos.net.tcp.ntpd 7.2.2.0 7.2.2.15 key_w_fs NTPv3
For NTPv4:
Fileset Lower Level Upper Level KEY PRODUCT(S)
---------------------------------------------------------------------
ntp.rte 7.4.2.8100 7.4.2.8100 key_w_fs NTPv4
To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide.
Example: lslpp -L | grep -i bos.net.tcp.client
Remediation/Fixes
A. APARS
IBM has assigned the following APARs to this problem:
For NTPv3:
AIX Level APAR Availability SP KEY PRODUCT(S)
------------------------------------------------------------
5.3.12 IJ06657 ** N/A key_w_apar NTPv3
6.1.9 IJ06651 ** SP12 key_w_apar NTPv3
7.1.4 IJ06652 ** SP7 key_w_apar NTPv3
7.1.5 IJ06653 ** SP3 key_w_apar NTPv3
7.2.0 IJ06654 ** N/A key_w_apar NTPv3
7.2.1 IJ06655 ** SP5 key_w_apar NTPv3
7.2.2 IJ06656 ** SP3 key_w_apar NTPv3
VIOS Level APAR Availability SP KEY PRODUCT(S)
----------------------------------------------------------------
2.2.4 IJ06651 ** N/A key_w_apar NTPv3
2.2.5 IJ06651 ** 2.2.5.50 key_w_apar NTPv3
2.2.6 IJ06651 ** 2.2.6.30 key_w_apar NTPv3
For NTPv4:
AIX Level APAR Availability SP KEY PRODUCT(S)
------------------------------------------------------------
6.1.9 IJ06400 ** SP12 key_w_apar NTPv4
7.1.4 IJ06400 ** SP7 key_w_apar NTPv4
7.1.5 IJ06400 ** SP3 key_w_apar NTPv4
7.2.0 IJ06400 ** N/A key_w_apar NTPv4
7.2.1 IJ06400 ** SP5 key_w_apar NTPv4
7.2.2 IJ06400 ** SP3 key_w_apar NTPv4
VIOS Level APAR Availability SP KEY PRODUCT(S)
----------------------------------------------------------------
2.2.4 IJ06400 ** N/A key_w_apar NTPv4
2.2.5 IJ06400 ** 2.2.5.50 key_w_apar NTPv4
2.2.6 IJ06400 ** 2.2.6.30 key_w_apar NTPv4
Subscribe to the APARs here:
http://www.ibm.com/support/docview.wss?uid=isg1IJ06400
http://www.ibm.com/support/docview.wss?uid=isg1IJ06651
http://www.ibm.com/support/docview.wss?uid=isg1IJ06652
http://www.ibm.com/support/docview.wss?uid=isg1IJ06653
http://www.ibm.com/support/docview.wss?uid=isg1IJ06654
http://www.ibm.com/support/docview.wss?uid=isg1IJ06655
http://www.ibm.com/support/docview.wss?uid=isg1IJ06656
https://www.ibm.com/support/docview.wss?uid=isg1IJ06400
https://www.ibm.com/support/docview.wss?uid=isg1IJ06651
https://www.ibm.com/support/docview.wss?uid=isg1IJ06652
https://www.ibm.com/support/docview.wss?uid=isg1IJ06653
https://www.ibm.com/support/docview.wss?uid=isg1IJ06654
https://www.ibm.com/support/docview.wss?uid=isg1IJ06655
https://www.ibm.com/support/docview.wss?uid=isg1IJ06656
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
AIX and VIOS fixes are available.
The AIX/VIOS fixes can be downloaded via ftp or http from:
ftp://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar
http://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar
https://aix.software.ibm.com/aix/efixes/security/ntp_fix10.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.
For NTPv3:
AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
----------------------------------------------------------
5.3.12.9 IJ06657m9a.180529.epkg.Z key_w_fix NTPv3
6.1.9.9 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
6.1.9.10 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
6.1.9.11 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
7.1.4.4 IJ06652m4a.180528.epkg.Z key_w_fix NTPv3
7.1.4.5 IJ06652m4a.180528.epkg.Z key_w_fix NTPv3
7.1.4.6 IJ06652m4a.180528.epkg.Z key_w_fix NTPv3
7.1.5.0 IJ06653m0a.180527.epkg.Z key_w_fix NTPv3
7.1.5.1 IJ06653m0a.180527.epkg.Z key_w_fix NTPv3
7.1.5.2 IJ06653m0a.180527.epkg.Z key_w_fix NTPv3
7.2.0.4 IJ06654m4a.180527.epkg.Z key_w_fix NTPv3
7.2.0.5 IJ06654m4a.180527.epkg.Z key_w_fix NTPv3
7.2.0.6 IJ06654m4a.180527.epkg.Z key_w_fix NTPv3
7.2.1.2 IJ06655m2a.180527.epkg.Z key_w_fix NTPv3
7.2.1.3 IJ06655m2a.180527.epkg.Z key_w_fix NTPv3
7.2.1.4 IJ06655m2a.180527.epkg.Z key_w_fix NTPv3
7.2.2.0 IJ06656m0a.180527.epkg.Z key_w_fix NTPv3
7.2.2.1 IJ06656m0a.180527.epkg.Z key_w_fix NTPv3
7.2.2.2 IJ06656m0a.180527.epkg.Z key_w_fix NTPv3
Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.2 is AIX 7200-02-02.
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
-----------------------------------------------------------
2.2.4.40 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.4.50 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.4.60 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.5.20 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.5.30 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.5.40 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.6.0 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.6.10 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
2.2.6.2x IJ06651m9a.180528.epkg.Z key_w_fix NTPv3
For NTPv4:
AIX Level Interim Fix (*.Z) KEY PRODUCT(S)
----------------------------------------------------------
6.1.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4
7.1.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4
7.2.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4
VIOS Level Interim Fix (*.Z) KEY PRODUCT(S)
-----------------------------------------------------------
2.2.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4
To extract the fixes from the tar file:
tar xvf ntp_fix10.tar
cd ntp_fix10
Verify you have retrieved the fixes intact:
The checksums below were generated using the "openssl dgst -sha256 file" command as the following:
openssl dgst -sha256 filename KEY
-----------------------------------------------------------------------------------------------------
456eefb0975171e71cedd71431b6e23ebf16b226c4344a34b9c6452cb862fc42 IJ06400s9a.180514.epkg.Z key_w_csum
e17cc1dc210f3b8f802d4b52cda05f1a89cd6de2cea371e9a7bea5452dd686f5 IJ06651m9a.180528.epkg.Z key_w_csum
3c92a6063d36be79cd716843fc8221f96911922a62b91a20e86d10ead054255a IJ06652m4a.180528.epkg.Z key_w_csum
17f7a37fedba73dd7e3862ced003436b22c5b74c7ca8dcc0dcde3306cff0d64f IJ06653m0a.180527.epkg.Z key_w_csum
7792b56540634644b2fb9b47a8d5449eb62a89ea83e965e265d5b3fe3a2d01bd IJ06654m4a.180527.epkg.Z key_w_csum
223874b300b8a4201c6f6cdc0eb53bc09e4c22f9f00902713143b3df3569e0c0 IJ06655m2a.180527.epkg.Z key_w_csum
f0e0c59274a89dc18064f8e49d4fa47de870e94b3b2d84d841f2e41c890cd035 IJ06656m0a.180527.epkg.Z key_w_csum
4a8e6ba8e5f5bf6651c339ee8ccffbcf6cd50f5004f1598d0ac70ecfe58ee823 IJ06657m9a.180529.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 Support at http://ibm.com/support/ and describe the discrepancy.
openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file]
openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file]
Published advisory OpenSSL signature file location:
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig
C. FIX AND INTERIM FIX INSTALLATION
If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding.
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
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.
After installation the ntp daemon must be restarted:
stopsrc -s xntpd
startsrc -s xntpd
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.
Workarounds and Mitigations
None.
Get Notified about Future Security Bulletins
References
Acknowledgement
None.
*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 Security Bulletin.
Disclaimer
Review the IBM security bulletin disclaimer and definitions regarding your responsibilities for assessing potential impact of security vulnerabilities to your environment.
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Document Information
Modified date:
14 August 2018
UID
ibm10718835