There is a vulnerability in bellmail that impacts AIX.

2017-01-29T01:19:56
ID BELLMAIL_ADVISORY2.ASC
Type aix
Reporter CentOS Project
Modified 2017-07-26T12:40:04

Description

IBM SECURITY ADVISORY

First Issued: Sun Jan 29 01:19:56 CST 2017 |Updated: Wed Jul 26 12:40:04 CDT 2017 |Update 1: Changed impacted upper level fileset level for AIX 7.2.1 to | bos.net.tcp.client_core 7.2.1.0.

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc

Security Bulletin: Vulnerability in bellmail affects AIX (CVE-2017-1093)

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

SUMMARY:

There is a vulnerability in bellmail that impacts AIX.

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

VULNERABILITY DETAILS:

CVEID: CVE-2017-1093
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1093
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1093
DESCRIPTION: IBM AIX could allow a local user to exploit a vulnerability in 
   the bellmail binary to gain root privileges.
CVSS Base Score: 8.4
CVSS Temporal Score: See
    https://exchange.xforce.ibmcloud.com/vulnerabilities/120653 for more
    information.
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)


AFFECTED PRODUCTS AND VERSIONS:

    AIX  6.1, 7.1, 7.2
    VIOS 2.2.x

    The following fileset levels are vulnerable:

    key_fileset = aix

    Fileset                Lower Level  Upper Level KEY
    ---------------------------------------------------------
    bos.net.tcp.client       6.1.9.0      6.1.9.200   key_w_fs
    bos.net.tcp.client       7.1.3.0      7.1.3.48    key_w_fs
    bos.net.tcp.client       7.1.4.0      7.1.4.30    key_w_fs
    bos.net.tcp.client_core  7.2.0.0      7.2.0.2     key_w_fs

| bos.net.tcp.client_core 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.net.tcp.client


REMEDIATION:

    A. APARS

        IBM has assigned the following APARs to this problem:

        AIX Level APAR     Availability  SP   KEY
        ------------------------------------------------
        6.1.9     IV92238  4/28/17      SP9  key_w_apar
        7.1.3     IV92250  6/30/17      SP9  key_w_apar
        7.1.4     IV92240  4/28/17      SP4  key_w_apar
        7.2.0     IV92241  6/30/17      SP4  key_w_apar
        7.2.1     IV92242  4/28/17      SP2  key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV92238
        http://www.ibm.com/support/docview.wss?uid=isg1IV92250
        http://www.ibm.com/support/docview.wss?uid=isg1IV92240
        http://www.ibm.com/support/docview.wss?uid=isg1IV92241
        http://www.ibm.com/support/docview.wss?uid=isg1IV92242

        https://www.ibm.com/support/docview.wss?uid=isg1IV92238
        https://www.ibm.com/support/docview.wss?uid=isg1IV92250
        https://www.ibm.com/support/docview.wss?uid=isg1IV92240
        https://www.ibm.com/support/docview.wss?uid=isg1IV92241
        https://www.ibm.com/support/docview.wss?uid=isg1IV92242

        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/bellmail_fix2.tar
        http://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar
        https://aix.software.ibm.com/aix/efixes/security/bellmail_fix2.tar

        The links above are to a tar file containing this signed
        advisory, interim fixes, and OpenSSL signatures for each interim fix.

        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
        ----------------------------------------------
        6.1.9.6    IV92238m8a.170112.epkg.Z  key_w_fix
        6.1.9.7    IV92238m8a.170112.epkg.Z  key_w_fix
        6.1.9.8    IV92238m8a.170112.epkg.Z  key_w_fix
        7.1.3.5    IV92250m71.170112.epkg.Z  key_w_fix
        7.1.3.6    IV92250m71.170112.epkg.Z  key_w_fix 
        7.1.3.7    IV92250m71.170112.epkg.Z  key_w_fix
        7.1.4.1    IV92240m3a.170112.epkg.Z  key_w_fix
        7.1.4.2    IV92240m3a.170112.epkg.Z  key_w_fix
        7.1.4.3    IV92240m3a.170112.epkg.Z  key_w_fix
        7.2.0.0    IV92241m2a.170112.epkg.Z  key_w_fix
        7.2.0.1    IV92241m2a.170112.epkg.Z  key_w_fix
        7.2.0.2    IV92241m2a.170112.epkg.Z  key_w_fix
        7.2.1.0    IV92242m1a.170112.epkg.Z  key_w_fix
        7.2.1.1    IV92242m1a.170112.epkg.Z  key_w_fix

        VIOS Level  Interim Fix (*.Z)         KEY
        -----------------------------------------------
        2.2.3.x    IV92238m8a.170112.epkg.Z  key_w_fix
        2.2.4.x    IV92238m8a.170112.epkg.Z  key_w_fix
        2.2.5.x    IV92238m8a.170112.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 bellmail_fix2.tar
        cd bellmail_fix2

        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
        -----------------------------------------------------------------------------------------------------
        7b7e3d8c23dbca6c8424acdddbac4c889f9f15d7dffa8f7fca46db7ad83ce008  IV92238m8a.170112.epkg.Z key_w_csum
        2307a711eeab2106418046c93402602163967a1395d963202f49316dcc1cb3d5  IV92250m71.170112.epkg.Z key_w_csum
        60f04e1bdfdb7065e4cebfb235581219aaae80a8dfa692187f790cfef8893abc  IV92240m3a.170112.epkg.Z key_w_csum
        254af14aec94ee9b1589e9f7420ff6dc67af2d773fa5ee94920a4ef453ebb2c0  IV92241m2a.170112.epkg.Z key_w_csum
        6b52bbbbc0af980a46e817e220d5bedfade19f2ff0db26d00d6761e3d2809a8c  IV92242m1a.170112.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
        security-alert@austin.ibm.com 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/bellmail_advisory2.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/bellmail_advisory2.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:

    security-alert@austin.ibm.com

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 security-alert@austin.ibm.com 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:

Vulnerability research and notification provided by Rhino Security Labs.

CHANGE HISTORY:

First Issued: Sun Jan 29 01:19:56 CST 2017

| Updated: Wed Jul 26 12:40:04 CDT 2017 | Update 1: Changed impacted upper level fileset level for AIX 7.2.1 to | bos.net.tcp.client_core 7.2.1.0.

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

*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.