Vulnerability in NTPv3 affects AIX,Vulnerability in NTPv3 affects VIOS

2015-08-2109:06:03

CentOS Project

aix.software.ibm.com

4.3 Medium

CVSS2

Access Vector

ADJACENT_NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

AV:A/AC:M/Au:N/C:N/I:P/A:P

0.008 Low

EPSS

Percentile

81.4%

JSON

IBM SECURITY ADVISORY

First Issued: Fri Aug 21 09:06:03 CDT 2015
|Updated: Mon Feb 15 13:19:18 CST 2016
|Update: Changed AIX 6.1.8 and 7.1.2 impacted levels.

The most recent version of this document is available here:

http://aix.software.ibm.com/aix/efixes/security/ntp_advisory3.asc
https://aix.software.ibm.com/aix/efixes/security/ntp_advisory3.asc
ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory3.asc

Security Bulletin: Vulnerability in NTPv3 affects AIX (CVE-2015-1799)

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

SUMMARY:

A vulnerability in NTPv3 affects AIX.

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

VULNERABILITY DETAILS:

CVEID: CVE-2015-1799
DESCRIPTION: Network Time Protocol (NTP) Project NTP daemon (ntpd) is
    vulnerable to a denial of service, caused by an error when using
    symmetric key authentication. By sending specially-crafted packets to
    both peering hosts, an attacker could exploit this vulnerability to
    prevent synchronization. 
CVSS Base Score: 5.4 
CVSS Temporal Score: See
    http://xforce.iss.net/xforce/xfdb/102052 for the current score.
CVSS Environmental Score*: Undefined
CVSS Vector: (AV:A/AC:M/Au:N/C:P/I:P/A:P)


AFFECTED PRODUCTS AND VERSIONS:

    AIX 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 6.1.0.0 6.1.8.20 key_w_fs
bos.net.tcp.client 6.1.0.0 6.1.9.45 key_w_fs
| bos.net.tcp.client 7.1.0.0 7.1.2.20 key_w_fs
bos.net.tcp.client 7.1.0.0 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) 6.1.8.19(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
        ---------------------------------------------------
        6.1.9     IV73783  12/04/15      SP6  key_w_apar
        7.1.3     IV74261  2/26/16       SP6  key_w_apar

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IV73783
        http://www.ibm.com/support/docview.wss?uid=isg1IV74261

        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/ntp_fix3.tar
        http://aix.software.ibm.com/aix/efixes/security/ntp_fix3.tar
        https://aix.software.ibm.com/aix/efixes/security/ntp_fix3.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
        ------------------------------------------------
        6.1.8.6    IV74263s6a.150714.epkg.Z  key_w_fix
        6.1.9.5    IV73783s5a.150714.epkg.Z  key_w_fix
        7.1.2.6    IV74262s6a.150714.epkg.Z  key_w_fix
        7.1.3.5    IV74261s5a.150714.epkg.Z  key_w_fix


        To extract the fixes from the tar file:

        tar xvf ntp_fix3.tar
        cd ntp_fix3

        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
        -----------------------------------------------------------------------------------------------------
        1b47c44eae7b3dd5d219586a5dafa806cd54c18872dbeee13774ae0f18242786  IV74263s6a.150714.epkg.Z key_w_csum
        ad3c3496796c9837ab7247a639e8d61e354d29c45daf940a39518f0ede5fe5ca  IV73783s5a.150714.epkg.Z key_w_csum
        785292432666ac70d019b31018965a03f3fcf8f870ec2a9473ec2e127a4a2f5f  IV74262s6a.150714.epkg.Z key_w_csum
        3ff500cc1235275a9ce1b66c9c0f41b94ccd500930dbc9d90a9e0dfe93364c14  IV74261s5a.150714.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 &lt;pubkey_file&gt; -signature &lt;advisory_file&gt;.sig &lt;advisory_file&gt;

        openssl dgst -sha1 -verify &lt;pubkey_file&gt; -signature &lt;ifix_file&gt;.sig &lt;ifix_file&gt;

        Published advisory OpenSSL signature file location:

        http://aix.software.ibm.com/aix/efixes/security/ntp_advisory3.asc.sig
        https://aix.software.ibm.com/aix/efixes/security/ntp_advisory3.asc.sig
        ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory3.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.

    You should verify applying this configuration change does not cause
    any compatibility issues. If you change the default setting after
    applying the fix, you will expose yourself to the attack described
    above. IBM recommends that you review your entire environment to
    identify other areas where you have enabled the Diffie-Hellman
    key-exchange protocol used in TLS and take appropriate mitigation and
    remediation actions.

WORKAROUNDS AND MITIGATIONS:

    None.

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

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:

None.

CHANGE HISTORY:

First Issued: Fri Aug 21 09:06:03 CDT 2015

| Updated: Mon Feb 15 13:19:18 CST 2016
| Update: Changed AIX 6.1.8 and 7.1.2 impacted levels.

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

*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.