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ibmIBMFF04A79FD2255A76DC6D215AC88E8DD2FDC5B49C0E66788E7485B6EC0B97B85D
HistoryAug 14, 2018 - 9:30 p.m.

Security Bulletin: Vulnerabilities in NTP affect AIX

2018-08-1421:30:02
www.ibm.com
11

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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

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&gt; 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&gt; 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&gt; 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&gt; 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&gt; 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&gt; 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&gt; 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&gt;
<http://www.ibm.com/support/docview.wss?uid=isg1IJ06651&gt;
<http://www.ibm.com/support/docview.wss?uid=isg1IJ06652&gt;
<http://www.ibm.com/support/docview.wss?uid=isg1IJ06653&gt;
<http://www.ibm.com/support/docview.wss?uid=isg1IJ06654&gt;
<http://www.ibm.com/support/docview.wss?uid=isg1IJ06655&gt;
<http://www.ibm.com/support/docview.wss?uid=isg1IJ06656&gt;

<https://www.ibm.com/support/docview.wss?uid=isg1IJ06400&gt;
<https://www.ibm.com/support/docview.wss?uid=isg1IJ06651&gt;
<https://www.ibm.com/support/docview.wss?uid=isg1IJ06652&gt;
<https://www.ibm.com/support/docview.wss?uid=isg1IJ06653&gt;
<https://www.ibm.com/support/docview.wss?uid=isg1IJ06654&gt;
<https://www.ibm.com/support/docview.wss?uid=isg1IJ06655&gt;
<https://www.ibm.com/support/docview.wss?uid=isg1IJ06656&gt;

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&gt;
<http://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar&gt;
<https://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar&gt;

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/&gt; 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&gt;
<https://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig&gt;
<ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig&gt;

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&gt;

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.

CPENameOperatorVersion
aixeqany

9.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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