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aixCentOS ProjectTCPDUMP_ADVISORY4.ASC
HistoryFeb 25, 2019 - 4:54 p.m.

There is a vulnerability in tcpdump that affects AIX.,There is a vulnerability in tcpdump that affects VIOS.

2019-02-2516:54:49
CentOS Project
aix.software.ibm.com
356

0.002 Low

EPSS

Percentile

51.0%

IBM SECURITY ADVISORY

First Issued: Mon Feb 25 16:54:49 CST 2019
|Updated: Tue Apr 9 09:55:34 CDT 2019
|Update: Increased the lower impacted fileset levels for some fileset
| levels. Please see the Fileset table in AFFECTED PRODUCTS AND VERSIONS
| for more information.

The most recent version of this document is available here:
http://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.asc
https://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.asc
ftp://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.asc

Security Bulletin: Vulnerability in tcpdump affects AIX (CVE-2018-19519)

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

SUMMARY:

There is a vulnerability in tcpdump that affects AIX.

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

VULNERABILITY DETAILS:

CVEID: CVE-2018-19519
    https://vulners.com/cve/CVE-2018-19519
    https://vulners.com/cve/CVE-2018-19519
DESCRIPTION: Tcpdump is vulnerable to a stack-based buffer overflow, 
    caused by improper bounds checking by the print_prefix function of 
    print-hncp.c. By using a specially-crafted packet data, a remote 
    attacker could overflow a buffer and execute arbitrary code on the 
    system or cause the application to crash.
CVSS Base Score: 7.3
CVSS Temporal Score: See 
    https://exchange.xforce.ibmcloud.com/vulnerabilities/153314
    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:L/A:L)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 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.server 6.1.9.300 6.1.9.400 key_w_fs
| bos.net.tcp.server 7.1.4.32 7.1.4.34 key_w_fs
bos.net.tcp.server 7.1.5.0 7.1.5.31 key_w_fs
| bos.net.tcp.tcpdump 7.2.1.1 7.2.1.3 key_w_fs
bos.net.tcp.tcpdump 7.2.2.0 7.2.2.16 key_w_fs
bos.net.tcp.tcpdump 7.2.3.0 7.2.3.15 key_w_fs

    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.server


REMEDIATION:

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

        AIX Level APAR     Availability  SP        KEY
        -----------------------------------------------------
        7.1.4     IJ12979  **            SP08-1914 key_w_apar
        7.1.5     IJ12980  **            SP04-1913 key_w_apar
        7.2.1     IJ12981  **            SP06-1914 key_w_apar
        7.2.2     IJ12982  **            SP04-1914 key_w_apar
        7.2.3     IJ12983  **            SP03-1913 key_w_apar

        VIOS Level APAR    Availability  SP       KEY
        ----------------------------------------------------
        2.2.5      IJ12978 **            2.2.5.60 key_w_apar
        2.2.6      IJ12978 **            2.2.6.40 key_w_apar
        3.1.0      IJ12983 **            3.1.0.20 key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IJ12978
        http://www.ibm.com/support/docview.wss?uid=isg1IJ12979
        http://www.ibm.com/support/docview.wss?uid=isg1IJ12980
        http://www.ibm.com/support/docview.wss?uid=isg1IJ12981
        http://www.ibm.com/support/docview.wss?uid=isg1IJ12982
        http://www.ibm.com/support/docview.wss?uid=isg1IJ12983

        https://www.ibm.com/support/docview.wss?uid=isg1IJ12978
        https://www.ibm.com/support/docview.wss?uid=isg1IJ12979
        https://www.ibm.com/support/docview.wss?uid=isg1IJ12980
        https://www.ibm.com/support/docview.wss?uid=isg1IJ12981
        https://www.ibm.com/support/docview.wss?uid=isg1IJ12982
        https://www.ibm.com/support/docview.wss?uid=isg1IJ12983

        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 and VIOS fixes can be downloaded via ftp or http from:

        ftp://aix.software.ibm.com/aix/efixes/security/tcpdump_fix4.tar
        http://aix.software.ibm.com/aix/efixes/security/tcpdump_fix4.tar
        https://aix.software.ibm.com/aix/efixes/security/tcpdump_fix4.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
        ----------------------------------------------
        7.1.4.5    IJ12979m5a.190304.epkg.Z  key_w_fix
        7.1.4.6    IJ12979m6a.190304.epkg.Z  key_w_fix
        7.1.4.7    IJ12979m7a.190205.epkg.Z  key_w_fix
        7.1.5.1    IJ12980m1a.190207.epkg.Z  key_w_fix
        7.1.5.2    IJ12980m2a.190212.epkg.Z  key_w_fix
        7.1.5.3    IJ12980m3a.190212.epkg.Z  key_w_fix
        7.2.1.3    IJ12981m3a.190214.epkg.Z  key_w_fix
        7.2.1.4    IJ12981m4a.190215.epkg.Z  key_w_fix
        7.2.1.5    IJ12981m5a.190225.epkg.Z  key_w_fix
        7.2.2.1    IJ12982m1a.190215.epkg.Z  key_w_fix
        7.2.2.2    IJ12982m2a.190215.epkg.Z  key_w_fix
        7.2.2.3    IJ12982m3a.190215.epkg.Z  key_w_fix
        7.2.3.0    IJ12983m0a.190215.epkg.Z  key_w_fix
        7.2.3.1    IJ12983m1a.190215.epkg.Z  key_w_fix
        7.2.3.2    IJ12983m2a.190215.epkg.Z  key_w_fix

        Please note that the above table refers to AIX TL/SP level as
        opposed to fileset level, i.e., 7.2.2.3 is AIX 7200-02-03.

        Please reference the Affected Products and Version section above
        for help with checking installed fileset levels.

        VIOS Level  Interim Fix (*.Z)         KEY
        -----------------------------------------------
        2.2.5.40    IJ12978s9a.190215.epkg.Z  key_w_fix
        2.2.5.50    IJ12978s9a.190215.epkg.Z  key_w_fix
        2.2.6.21    IJ12978sBa.190215.epkg.Z  key_w_fix
        2.2.6.23    IJ12978sBa.190215.epkg.Z  key_w_fix
        2.2.6.31    IJ12978sCa.190215.epkg.Z  key_w_fix
        2.2.6.32    IJ12978sCa.190215.epkg.Z  key_w_fix
        3.1.0.10    IJ12983m2a.190215.epkg.Z  key_w_fix

        To extract the fixes from the tar file:

        tar xvf tcpdump_fix4.tar
        cd tcpdump_fix4

        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
        -----------------------------------------------------------------------------------------------------
        2e05ddb65cb649d7c68342573823c7aca9febbf55ac4e4b761c6cc3429f9c472  IJ12978s9a.190215.epkg.Z key_w_csum
        819ab2731f480d654db43159adf92176726edbc9377769e0215461713c933714  IJ12978sBa.190215.epkg.Z key_w_csum
        216fc77d43f0713873ccb0cc7b5f531216245e4eefc02ca07b56b763ddf0c5da  IJ12978sCa.190215.epkg.Z key_w_csum
        8a8c3ba84781f2b0f007ac93568a629be5bd65119b7b76a75f4c80496f8193ed  IJ12979m5a.190304.epkg.Z key_w_csum
        a8f82929828046dabbfe0f22b998026878254b31948e943ba7487d8b12ab598b  IJ12979m6a.190304.epkg.Z key_w_csum
        959cc124a81763c57bd1c9576f8c180a581f7685a9b6ee17e517f9863dc5f7c7  IJ12979m7a.190205.epkg.Z key_w_csum
        50eb9a6281393c0f4464c54e984fc66cb3be0ed931b2e828b6ca9a38c5477b03  IJ12980m1a.190207.epkg.Z key_w_csum
        5d8fba67e88068dba76fbd7dd6ee4fc8d01de2e4c1b5fd99ce672624ab62b2bc  IJ12980m2a.190212.epkg.Z key_w_csum
        0c0790166da0f92f198abfe50255a9282c458a8f3f8158b17660512e67de8003  IJ12980m3a.190212.epkg.Z key_w_csum
        1d25c5255cf39f872e516e2e312894bf9677e6d1062a74ba5b792425647032c7  IJ12981m3a.190214.epkg.Z key_w_csum
        a2932c10a0755981827ef6f105e5d393c29a91766de28e99a442f3845f505227  IJ12981m4a.190215.epkg.Z key_w_csum
        cae215ce40cf9bd51f4fbbdee172258a1b24143cf1004e30b102416b359a4a87  IJ12981m5a.190225.epkg.Z key_w_csum
        2f94de4c9d3fc3aaf55aa923fb8cc25054b436d28b03a8e145f2197d74938e95  IJ12982m1a.190215.epkg.Z key_w_csum
        5ea43c493fdeb5889a58a138b7050de20e6ef776a39c2def0fc06c58bc227940  IJ12982m2a.190215.epkg.Z key_w_csum
        1a8bbeed0a375739b133c317099ab938a43f670a355fd76f16641a640c7039d3  IJ12982m3a.190215.epkg.Z key_w_csum
        b1d3979a1e9a5c1ed90a15d24974ba80430573e0ae61ee967d4c7304bdef8c94  IJ12983m0a.190215.epkg.Z key_w_csum
        1e48107063297522366390de5eb1648a1d98edbaf3092bddf8aecec6ce45af6b  IJ12983m1a.190215.epkg.Z key_w_csum
        b87249e90504d241f9359c66f16527e2cd73c1b50a05199d4968ad5a79f10af7  IJ12983m2a.190215.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/tcpdump_advisory4.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/tcpdump_advisory4.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.

        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:

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

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: Vulnerability in tcpdump affects AIX (CVE-2018-19519)
    https://www-01.ibm.com/support/docview.wss?uid=ibm10873086

ACKNOWLEDGEMENTS:

None.

CHANGE HISTORY:

First Issued: Mon Feb 25 16:54:49 CST 2019
Updated: Wed Mar  6 16:31:00 CST 2019
Update: Additional AIX iFixes now available.

| Updated: Tue Apr 9 09:55:34 CDT 2019
| Update: Increased the lower impacted fileset levels for some fileset
| levels. Please see the Fileset table in AFFECTED PRODUCTS AND VERSIONS
| for more information.

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

*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 β€œindustry open standard
designed to convey vulnerability severity and help to determine urgency and
priority of response.” IBM PROVIDES THE CVSS SCORES β€œAS 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.