There are vulnerabilities in NTPv4 that affect AIX.

IBM SECURITY ADVISORY

First Issued: Fri Dec 14 12:20:13 CST 2018

The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc

Security Bulletin: Vulnerabilities in NTPv4 affect AIX (CVE-2018-12327,
CVE-2018-7170)

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

SUMMARY:

There are vulnerabilities in NTPv4 that affect AIX.

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

VULNERABILITY DETAILS:

NTPv4 is vulnerable to:

CVEID: CVE-2018-12327
    https://vulners.com/cve/CVE-2018-12327
    https://vulners.com/cve/CVE-2018-12327
DESCRIPTION: NTP is vulnerable to a stack-based buffer overflow, caused 
    by improper bounds checking by ntpq and ntpdc. By sending an overly 
    long string argument, a local attacker could overflow a buffer and 
    execute arbitrary code on the system with elevated privileges or 
    cause the application to crash.
CVSS Base Score: 5.9
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/145120
    for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)

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)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 6.1, 7.1, 7.2
    VIOS 2.2.x 

    The vulnerabilities in the following filesets are being addressed:
    
    key_fileset = aix

    For NTPv4:

    Fileset                 Lower Level  Upper Level KEY       PRODUCT(S)
    ---------------------------------------------------------------------
    ntp.rte                 7.4.2.8100   7.4.2.8110  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 ntp.rte


REMEDIATION:

    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_fix11.tar
        http://aix.software.ibm.com/aix/efixes/security/ntp_fix11.tar
        https://aix.software.ibm.com/aix/efixes/security/ntp_fix11.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 NTPv4:

        AIX Level  Interim Fix (*.Z)         KEY        PRODUCT(S)
        ----------------------------------------------------------
        6.1.x      IJ10280s3b.181206.epkg.Z  key_w_fix  NTPv4
        7.1.x      IJ10280s3b.181206.epkg.Z  key_w_fix  NTPv4
        7.2.x      IJ10280s3b.181206.epkg.Z  key_w_fix  NTPv4

        VIOS Level  Interim Fix (*.Z)         KEY        PRODUCT(S)
        -----------------------------------------------------------
        2.2.x       IJ10280s3b.181206.epkg.Z  key_w_fix  NTPv4

        To extract the fixes from the tar file:

        tar xvf ntp_fix11.tar 
        cd ntp_fix11

        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
        -----------------------------------------------------------------------------------------------------
        000891c62f5e59c34909399d0ef4c74c72048a4fc1e7e50b66dedaa4fcf0ee87  IJ10280s3b.181206.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_advisory11.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory11.asc.sig 

    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.

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    https://ibm.com/support/

To obtain the OpenSSL public key that can be used to verify the
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    Download the key from our web page:

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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 NTPv4 affect AIX (CVE-2018-12327,
CVE-2018-7170)
    https://www-01.ibm.com/support/docview.wss?uid=ibm10744497

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Fri Dec 14 12:20:13 CST 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.