Vulnerability in netstat affects AIX,Vulnerability in netstat affects VIOS

IBM SECURITY ADVISORY

First Issued: Mon Oct 12 14:17:27 CDT 2015
|Updated: Fri Oct 16 16:41:29 CDT 2015
|Update: New iFixes provided

The most recent version of this document is available here:

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

Security Bulletin: Vulnerability in netstat affects AIX (CVE-2015-4948)

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

SUMMARY:

IBM AIX could allow a local attacker to escalate their privileges to root
access through a vulnerability in netstat when a fiber channel adapter is
present. 

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

VULNERABILITY DETAILS:

CVEID: CVE-2015-4948
DESCRIPTION: IBM AIX could allow a local attacker to escalate their
    privileges to root access through a vulnerability in netstat when a
    fiber channel adapter is present.
CVSS Base Score: 7.4 
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/104945 for the
    current score
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 5.3, 6.1, 7.1
    VIOS 2.2.x

    The following AIX fileset levels are vulnerable:

    AIX Fileset        Lower Level Upper Level KEY
    --------------------------------------------------------
    bos.net.tcp.client 5.3.12.0    5.3.12.10   key_w_fs
    bos.net.tcp.client 6.1.8.0     6.1.8.20    key_w_fs
    bos.net.tcp.client 6.1.9.0     6.1.9.45    key_w_fs
    bos.net.tcp.client 7.1.2.0     7.1.2.20    key_w_fs
    bos.net.tcp.client 7.1.3.0     7.1.3.45    key_w_fs

    AIX Fileset (VIOS)  Lower Level           Upper Level
    ------------------------------------------------------------
    bos.net.tcp.client  6.1.0.0(2.2.0.0)      6.1.8.20(2.2.2.70)
    bos.net.tcp.client  6.1.0.0(2.2.0.0)      6.1.9.45(2.2.3.50)

    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.net.tcp.client

REMEDIATION:

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

        AIX Level APAR     Availability  SP   KEY
        ---------------------------------------------------
        5.3.12    IV77039  N/A           N/A  key_w_apar
        6.1.8     IV77037  N/A           N/A  key_w_apar
        6.1.9     IV75940  12/04/15      SP6  key_w_apar
        7.1.2     IV77038  N/A           N/A  key_w_apar
        7.1.3     IV77299  2/26/16       SP6  key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV75940
        http://www.ibm.com/support/docview.wss?uid=isg1IV77299

        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.
        
        The fixes can be downloaded via ftp or http from:

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

        AIX Level  Interim Fix (*.Z)         KEY
        ------------------------------------------------

| 5.3.12.9 IV77039s9b.151016.epkg.Z key_w_fix
| 6.1.8.7 IV77037s7b.151016.epkg.Z key_w_fix
| 6.1.9.5 IV75940s5b.151016.epkg.Z key_w_fix
| 7.1.2.7 IV77038s7b.151016.epkg.Z key_w_fix
| 7.1.3.5 IV77299s5b.151016.epkg.Z key_w_fix

        VIOS Level  Interim Fix (*.Z)         KEY
        ------------------------------------------------

| 2.2.2.70 IV77037s7b.151016.epkg.Z key_w_fix
| 2.2.3.50 IV75940s5b.151016.epkg.Z key_w_fix

        To extract the fixes from the tar file:

        tar xvf netstat_fix.tar
        cd netstat_fix

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the
        "openssl dgst -sha256 file" command as the followng:

        openssl dgst -sha256                                              filename                 KEY
        -----------------------------------------------------------------------------------------------------

| 2e1c4dc2c7dc63874b7c86f36c75a86e09dbb0a560c8f4dd0fb91e96e26b8019 IV77039s9b.151016.epkg.Z key_w_csum
| 53857dba460e06101a7ddfd0055427cafdefeaf324b652020ad4e2a27e7fcad4 IV77037s7b.151016.epkg.Z key_w_csum
| be3b1d4e6da0efb264b88636d4ff7e9df754478a8e79f0af72e42d9cd1efd6b6 IV75940s5b.151016.epkg.Z key_w_csum
| b9ed7d8d29083e53a8ca0c06ca4e9e2af04197cca5d22fa20c106db45c185f2b IV77038s7b.151016.epkg.Z key_w_csum
| 1961a992e9bb2777902f4dcce65e0442bce099251e040611a0ffbf36b5490ed7 IV77299s5b.151016.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/netstat_advisory.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/netstat_advisory.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/netstat_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

        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:

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

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

To view previously issued advisories, please visit:

    http://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

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

    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 Guide:  http://www.first.org/cvss/cvss-guide.html
On-line Calculator V2:
    http://nvd.nist.gov/cvss.cfm?calculator&adv&version=2

ACKNOWLEDGEMENTS:

CVE-2015-4948 was reported to IBM by Pavel Jirout at Novartis. 

CHANGE HISTORY:

First Issued: Mon Oct 12 14:17:27 CDT 2015 

| Updated: Fri Oct 16 16:41:29 CDT 2015
| Update: New iFixes provided

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

*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.