Vulnerabilities in NTP affect AIX,Vulnerabilities in NTP affect VIOS

IBM SECURITY ADVISORY

First Issued: Tue Aug 14 14:48:57 CDT 2018

The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc

Security Bulletin: Vulnerabilities in NTP affect AIX

===============================================================================

SUMMARY:

There are multiple vulnerabilities in NTPv3 and NTPv4 that affect AIX.

===============================================================================

VULNERABILITY DETAILS:

NTPv3 is vulnerable to:

CVEID: CVE-2014-5209
    https://vulners.com/cve/CVE-2014-5209
    https://vulners.com/cve/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
    https://vulners.com/cve/CVE-2018-7182
    https://vulners.com/cve/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
    https://vulners.com/cve/CVE-2018-7183
    https://vulners.com/cve/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
    https://vulners.com/cve/CVE-2018-7170
    https://vulners.com/cve/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
    https://vulners.com/cve/CVE-2018-7184
    https://vulners.com/cve/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
    https://vulners.com/cve/CVE-2018-7185
    https://vulners.com/cve/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
    https://vulners.com/cve/CVE-2016-1549
    https://vulners.com/cve/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:

    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.

===============================================================================

CONTACT US:

Note: Keywords labeled as KEY in this document are used for parsing
purposes.

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

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To view previously issued advisories, please visit:

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

Contact IBM Support for questions related to this announcement:

    http://ibm.com/support/
    https://ibm.com/support/

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

    Download the key from our web page:

ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt

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

REFERENCES:

Complete CVSS v3 Guide:  http://www.first.org/cvss/user-guide
On-line Calculator v3:
    http://www.first.org/cvss/calculator/3.0

RELATED INFORMATION:

IBM Secure Engineering Web Portal
    http://www.ibm.com/security/secure-engineering/bulletins.html

IBM Product Security Incident Response Blog
    https://www.ibm.com/blogs/psirt/

Security Bulletin: Vulnerabilities in NTP affect AIX 
    https://www-01.ibm.com/support/docview.wss?uid=ibm10718835

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Tue Aug 14 14:48:57 CDT 2018

===============================================================================

*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
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.