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Security Bulletin: Vulnerability impacts AIX and VIOS (CVE-2018-1383)

Security Bulletin


Summary

IBM has released the following fixes for AIX and VIOS in response to CVE-2018-1383.

Vulnerability Details

CVEID: CVE-2018-1383
DESCRIPTION: A software logic bug creates a vulnerability in an AIX 6.1, 7.1, and 7.2 daemon which could allow a user with root privileges on one system, to obtain root access on another machine.
CVSS Base Score: 9.1
CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/138117 for the current score
CVSS Environmental Score*: Undefined
CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H)

Affected Products and Versions

AIX 6.1, 7.1, 7.2
VIOS 2.2.x

The vulnerabilities in the following filesets are being addressed:

key_fileset = aix

    Fileset                 Lower Level  Upper Level KEY
    ---------------------------------------------------------
    bos.cluster.rte         6.1.9.0      6.1.9.300   key_w_fs
    bos.cluster.rte         7.1.4.0      7.1.4.32    key_w_fs
    bos.cluster.rte         7.1.5.0      7.1.5.0     key_w_fs
    bos.cluster.rte         7.2.0.0      7.2.0.5     key_w_fs
    bos.cluster.rte         7.2.1.0      7.2.1.2     key_w_fs
    bos.cluster.rte         7.2.2.0      7.2.2.0     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.cluster.rte

Remediation/Fixes

A. APARS

IBM has assigned the following APARs to this problem:

    AIX Level APAR     Availability  SP   KEY
    ------------------------------------------------
    6.1.9     IJ02726  **            SP11 key_w_apar
    7.1.4     IJ02825  **            SP6  key_w_apar
    7.1.5     IJ02727  **            SP2  key_w_apar
    7.2.0     IJ02827  **            SP6  key_w_apar
    7.2.1     IJ02828  **            SP4  key_w_apar
    7.2.2     IJ02729  **            SP2  key_w_apar

Subscribe to the APARs here:

http://www.ibm.com/support/docview.wss?uid=isg1IJ02726
http://www.ibm.com/support/docview.wss?uid=isg1IJ02727
http://www.ibm.com/support/docview.wss?uid=isg1IJ02729
http://www.ibm.com/support/docview.wss?uid=isg1IJ02825
http://www.ibm.com/support/docview.wss?uid=isg1IJ02827
http://www.ibm.com/support/docview.wss?uid=isg1IJ02828
https://www.ibm.com/support/docview.wss?uid=isg1IJ02726
https://www.ibm.com/support/docview.wss?uid=isg1IJ02727
https://www.ibm.com/support/docview.wss?uid=isg1IJ02729
https://www.ibm.com/support/docview.wss?uid=isg1IJ02825
https://www.ibm.com/support/docview.wss?uid=isg1IJ02827
https://www.ibm.com/support/docview.wss?uid=isg1IJ02828

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

ftp://aix.software.ibm.com/aix/efixes/security/aixbase_fix.tar
http://aix.software.ibm.com/aix/efixes/security/aixbase_fix.tar
https://aix.software.ibm.com/aix/efixes/security/aixbase_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
    ----------------------------------------------
    6.1.9.8    IJ02726s8a.171221.epkg.Z  key_w_fix
    6.1.9.9    IJ02726s9a.171221.epkg.Z  key_w_fix
    6.1.9.10   IJ02726sAa.171221.epkg.Z  key_w_fix
    7.1.4.3    IJ02825s3a.171221.epkg.Z  key_w_fix
    7.1.4.4    IJ02825s4a.171221.epkg.Z  key_w_fix
    7.1.4.5    IJ02825s5a.171221.epkg.Z  key_w_fix
    7.1.5.0    IJ02727s1a.171221.epkg.Z  key_w_fix
    7.1.5.1    IJ02727s1a.171221.epkg.Z  key_w_fix
    7.2.0.3    IJ02827s3a.171221.epkg.Z  key_w_fix
    7.2.0.4    IJ02827s4a.171221.epkg.Z  key_w_fix
    7.2.0.5    IJ02827s5a.171221.epkg.Z  key_w_fix
    7.2.1.1    IJ02828s1a.171221.epkg.Z  key_w_fix
    7.2.1.2    IJ02828s2a.171221.epkg.Z  key_w_fix
    7.2.1.3    IJ02828s3a.171221.epkg.Z  key_w_fix
    7.2.2.0    IJ02729s1a.171221.epkg.Z  key_w_fix
    7.2.2.1    IJ02729s1a.171221.epkg.Z  key_w_fix
     
Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.1 is AIX 7200-02-01. 

    VIOS Level  Interim Fix (*.Z)         KEY
    -----------------------------------------------
    2.2.4.30    IJ02726s8a.171221.epkg.Z  key_w_fix
    2.2.4.40    IJ02726s9a.171221.epkg.Z  key_w_fix
    2.2.5.10    IJ02726s8a.171221.epkg.Z  key_w_fix
    2.2.5.20    IJ02726s9a.171221.epkg.Z  key_w_fix
    2.2.5.30    IJ02726sAa.171221.epkg.Z  key_w_fix
    2.2.6.0     IJ02726sAa.171221.epkg.Z  key_w_fix
    2.2.6.10    IJ02726sAa.171221.epkg.Z  key_w_fix
            
To extract the fixes from the tar file:

    tar xvf aixbase_fix.tar
    cd aixbase_fix

Verify you have retrieved the fixes intact.

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

    openssl dgst -sha256                                              filename                 KEY
    -----------------------------------------------------------------------------------------------------
    77a66084b51a448510fb01af2633b3b43589ae64df4e1a1407a0030e8699ddc0  IJ02726s8a.171221.epkg.Z key_w_csum
    1e854be8068ad5b9ee4ddd30570144d9b14dcf37d2db574f9b4268345ac3a28b  IJ02726s9a.171221.epkg.Z key_w_csum
    c6dd5ccdb979a9a17e7a4266e5c6e0af4b25281921f165276ad159401ff5aa86  IJ02726sAa.171221.epkg.Z key_w_csum
    d3422b3a86b68fc986078633ac00791115773e6a520ec939aa7d55dfe451ead4  IJ02727s1a.171221.epkg.Z key_w_csum
    90cb1c39ac03158c924fc0785ca62f456d2cb454736507b1df0b6a71b83912e8  IJ02729s1a.171221.epkg.Z key_w_csum
    663804ccb7ccb319a0da68ff157cc41de20e1df23c7cfa4375dcf036cfbf26b8  IJ02825s3a.171221.epkg.Z key_w_csum
    040157614b623e8de55a066b8e1db82fa87af6cbfd4f9d1dbac0236c7aadc934  IJ02825s4a.171221.epkg.Z key_w_csum
    f33ef3d8441b0b1726df92be7027ba274c7e95eaa088bddc2f91ef3edef551a4  IJ02825s5a.171221.epkg.Z key_w_csum
    6beca72bde8ad0da0634ca17e39e614e21e127e5960dd3ffef10af84a8c84685  IJ02827s3a.171221.epkg.Z key_w_csum
    dc47a6f5ec8f5530d77b288dd972f64945281b8637d207a7884fb1c7cea02093  IJ02827s4a.171221.epkg.Z key_w_csum
    475cded7dbaf56e39937fe1418b9a09a6ebb3c66e161d49890f129f5c89830c9  IJ02827s5a.171221.epkg.Z key_w_csum
    7beb4d34d7d0a7e46a899a66f610a5959b6eff35872a87aa1cf7d7d24bef9294  IJ02828s1a.171221.epkg.Z key_w_csum
    07359a15361720147a7897acbe4757f6a0bb0ef1d027817f478146e6366e76bb  IJ02828s2a.171221.epkg.Z key_w_csum
    2683bfdc36327dd8cfbd49ad3f4521d3711cc3af49138314b8f7e4665b8ed4b7  IJ02828s3a.171221.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/aixbase_advisory.asc.sig
https://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.asc.sig
ftp://aix.software.ibm.com/aix/efixes/security/aixbase_advisory.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.

Get Notified about Future Security Bulletins

References

Complete CVSS v3 Guide
On-line Calculator v3

Related information

IBM Secure Engineering Web Portal
IBM Product Security Incident Response Blog

Acknowledgement

None.

Change History

Updated: Tue Feb 13 11:05:56 CST 2018
Update: CVE description was updated to provide additional detail.

*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.

Document information

More support for: AIX Enterprise Edition

Software version: 6.1, 7.1, 7.2

Operating system(s): AIX

Software edition: Enterprise, Standard

Reference #: T1026948

Modified date: 13 February 2018


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