There is a vulnerability in sysproc that impacts AIX.

IBM SECURITY ADVISORY

First Issued: Mon Jan 30 13:51:08 CST 2017

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/sysproc_advisory.asc
https://aix.software.ibm.com/aix/efixes/security/sysproc_advisory.asc
ftp://aix.software.ibm.com/aix/efixes/security/sysproc_advisory.asc

Security Bulletin: Vulnerability in sysproc affects AIX (CVE-2016-8944)

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

SUMMARY:

There is a vulnerability in sysproc that impacts AIX. 

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

VULNERABILITY DETAILS:

CVEID: CVE-2016-8944
https://vulners.com/cve/CVE-2016-8944
https://vulners.com/cve/CVE-2016-8944
DESCRIPTION: IBM AIX allows a local user to open a file with a specially 
crafted argument that would crash the system.
CVSS Base Score: 6.2
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/118831 for more
    information.
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 7.1, 7.2
    
    The following fileset levels are vulnerable:
    
    key_fileset = aix
    
    Fileset        Lower Level  Upper Level KEY
    ---------------------------------------------------------
    bos.mp64       7.1.3.0      7.1.3.48    key_w_fs
    bos.mp64       7.1.4.0      7.1.4.30    key_w_fs
    bos.mp64       7.2.0.0      7.2.0.1     key_w_fs
    bos.mp64       7.2.1.0      7.2.1.0     key_w_fs

    Note:  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.mp64


REMEDIATION:

    A. APARS
        
        IBM has assigned the following APARs to this problem:

        AIX Level APAR     Availability  SP   KEY
        ------------------------------------------------
        7.1.3     IV91488  6/30/17      SP9  key_w_apar
        7.1.4     IV91487  4/28/17      SP4  key_w_apar
        7.2.0     IV91456  6/30/17      SP4  key_w_apar
        7.2.1     IV90234  4/28/17      SP2  key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV91488
        http://www.ibm.com/support/docview.wss?uid=isg1IV91487
        http://www.ibm.com/support/docview.wss?uid=isg1IV91456
        http://www.ibm.com/support/docview.wss?uid=isg1IV90234

        https://www.ibm.com/support/docview.wss?uid=isg1IV91488
        https://www.ibm.com/support/docview.wss?uid=isg1IV91487
        https://www.ibm.com/support/docview.wss?uid=isg1IV91456
        https://www.ibm.com/support/docview.wss?uid=isg1IV90234

        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

        Fixes are available. A system reboot is required after
        installing the iFixes for them to take effect.

        The fixes can be downloaded via ftp or http from:

        ftp://aix.software.ibm.com/aix/efixes/security/sysproc_fix.tar
        http://aix.software.ibm.com/aix/efixes/security/sysproc_fix.tar
        https://aix.software.ibm.com/aix/efixes/security/sysproc_fix.tar 

        The links above are 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
        ----------------------------------------------
        7.1.3.5   IV91488s5a.161212.epkg.Z  key_w_fix
        7.1.3.6   IV91488s6a.161212.epkg.Z  key_w_fix 
        7.1.3.7   IV91488s7a.161213.epkg.Z  key_w_fix
        7.1.4.1   IV91487s1a.161212.epkg.Z  key_w_fix
        7.1.4.2   IV91487s2a.161213.epkg.Z  key_w_fix
        7.1.4.3   IV91487s3a.161213.epkg.Z  key_w_fix
        7.2.0.0   IV91456s0a.161212.epkg.Z  key_w_fix
        7.2.0.1   IV91456s1a.161212.epkg.Z  key_w_fix
        7.2.0.2   IV91456s2a.161212.epkg.Z  key_w_fix
        7.2.1.0   IV90234s0a.161212.epkg.Z  key_w_fix
        
        Please note that the above table refers to AIX TL/SP level as
        opposed to fileset level, i.e., 7.1.4.1 is AIX 7100-04-01.

        To extract the fixes from the tar file:

        tar xvf sysproc_fix.tar
        cd sysproc_fix

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the
        "openssl dgst -sha256 <filename>" command as the following:

        openssl dgst -sha256                                              filename                 KEY
        -----------------------------------------------------------------------------------------------------
        e75188642bcb3156a6bc7c108042b27f3a5b35f3bdb3b19cfd3cc670945839ad  IV91488s5a.161212.epkg.Z key_w_csum
        d0ce64b9444498e6046c544f32b54dacbbe8084c91229bdc5e8ac72a4a74c85f  IV91488s6a.161212.epkg.Z key_w_csum
        7fdf22a22049b7ce73e5b4c54bd757d8cfdf8ff0af22efeac8904b39026c3257  IV91488s7a.161213.epkg.Z key_w_csum
        ac342edec9b84946d1bb6bba9f1183bdafad83afbb7ad8ea19c3e7e239e3d297  IV91487s1a.161212.epkg.Z key_w_csum
        650deeabe93e91269de1fee3764a54dd169e9d99a5b6cf369cb8a06ada270151  IV91487s2a.161213.epkg.Z key_w_csum
        ef3ea931ad5d21b79c05e4a4576606a8063eb7984da19564b6e614cc359c79bc  IV91487s3a.161213.epkg.Z key_w_csum
        c5d5def9d1d69c9a9d6cf5bbdde8f6a3eb97b818a2f5ee27452e3fffcc973fd1  IV91456s0a.161212.epkg.Z key_w_csum
        9d53be630a5141ea8af712bbbb3c1349edfd475e771df8d2ce46e47dfecd82ba  IV91456s1a.161212.epkg.Z key_w_csum
        de16f1418c3f4e9542199fad00045fe52bec86a60389eb92165a449a3548584c  IV91456s2a.161212.epkg.Z key_w_csum
        5bc0adba25bcf8a37fe4d357e66411717aa74c201fdfbd171759770d3cbba529  IV90234s0a.161212.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
        [email protected] 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/sysproc_advisory.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/sysproc_advisory.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/sysproc_advisory.asc.sig 

    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.

        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
        https://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html

        To preview an interim fix installation:

        emgr -e epkg_name -p         # where epkg_name is the name of the
                                     # interim fix package being previewed.

        To install an interim fix package:

        emgr -e epkg_name -X         # where epkg_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":

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

To view previously issued advisories, please visit:

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

Comments regarding the content of this announcement can be
directed to:

    [email protected]

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
https://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 via [email protected] you
can either:

    A. Download the key from our web page:

http://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt
https://www.ibm.com/systems/resources/systems_p_os_aix_security_pgppubkey.txt

    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.

REFERENCES:

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

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Mon Jan 30 13:51:08 CST 2017 

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

*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.