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Category:   OS (UNIX)  >   AIX Vendors:   IBM
AIX 'ps' Command Discloses Process Environment Variables to Local Users
SecurityTracker Alert ID:  1019265
SecurityTracker URL:  http://securitytracker.com/id/1019265
CVE Reference:   CVE-2008-0589   (Links to External Site)
Updated:  Feb 7 2008
Original Entry Date:  Jan 24 2008
Impact:   Disclosure of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): 5.2, 5.3, 6.1
Description:   A vulnerability was reported in IBM AIX. A local user can view process environment variables.

A local user can invoke the 'ps' command to view the values of all processes environment variables.

A demonstration exploit is available at:

http://rawlab.mindcreations.com/codes/exp/nix/ibmaixps.sh

Andrea "bunker" Purificato reported this vulnerability.

Impact:   A local user can view process environment variables.
Solution:   The vendor plans to issued the following fixes:

AIX Level APAR number Availability

5.2.0 IZ11242 05/14/08
5.3.0 IZ12745 04/30/08
5.3.7 IZ11243 04/30/08
6.1.0 IZ11244 02/20/08

An efix is available at:

ftp://aix.software.ibm.com/aix/efixes/security/ps_ifix.tar

The IBM advisories are available at:

http://www.ibm.com/support/docview.wss?uid=isg1IZ11242
http://www.ibm.com/support/docview.wss?uid=isg1IZ12745
http://www.ibm.com/support/docview.wss?uid=isg1IZ11243
http://www.ibm.com/support/docview.wss?uid=isg1IZ11244

Vendor URL:  www.ibm.com/ (Links to External Site)
Cause:   Access control error
Underlying OS:  

Message History:   None.


 Source Message Contents

Date:  Wed, 23 Jan 2008 21:55:38 -0500
Subject:  IBM AIX


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

IBM SECURITY ADVISORY

First Issued: Tue Jan 22 14:02:18 CST 2008
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX ps information leak

PLATFORMS:       AIX 5.2, 5.3, 6.1

SOLUTION:        Apply the fix as described below.

THREAT:          A local attacker may access sensitive information.

CERT VU Number:  n/a
CVE Number:      n/a
===============================================================================
                           DETAILED INFORMATION

I. OVERVIEW

    The ps command shows current status of processes.  The primary
    fileset for the ps command is'bos.rte.control'.  The ps command
    allows local users to obtain sensitive information.

II. DESCRIPTION

    An information leak exists in the 'bos.rte.control' fileset
    commands listed below.  A local attacker may access sensitive
    information for arbitrary processes. 

    The following commands are vulnerable: 

        /usr/bin/ps

III. IMPACT

    The successful exploitation of this vulnerability allows a
    non-privileged user to access sensitive data for arbitrary
    processes.

IV. PLATFORM VULNERABILITY ASSESSMENT

    To determine if your system is vulnerable, execute the following
    command:

    lslpp -L bos.rte.control

    The following fileset levels are vulnerable:

    AIX Fileset        Lower Level       Upper Level
    ------------------------------------------------
    bos.rte.control    5.2.0.0           5.2.0.107
    bos.rte.control    5.3.0.0           5.3.0.64
    bos.rte.control    5.3.7.0           5.3.7.1
    bos.rte.control    6.1.0.0           6.1.0.3

V. SOLUTIONS

    A. APARS

        IBM provides the following fixes:

        AIX Level           APAR number        Availability
        ---------------------------------------------------
        5.2.0               IZ11242            05/14/08
        5.3.0               IZ12745            04/30/08
        5.3.7               IZ11243            04/30/08
        6.1.0               IZ11244            02/20/08

        Subscribe to the APARs here:

        http://www.ibm.com/support/docview.wss?uid=isg1IZ11242
        http://www.ibm.com/support/docview.wss?uid=isg1IZ12745
        http://www.ibm.com/support/docview.wss?uid=isg1IZ11243
        http://www.ibm.com/support/docview.wss?uid=isg1IZ11244

        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
        from:

        ftp://aix.software.ibm.com/aix/efixes/security/ps_ifix.tar

        The link above is to a tar file containing this signed
        advisory, fix packages, and PGP 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
        -------------------------------------------------------------------
        5.2.0 TL8          IZ11242_08.080110.epkg.Z
        5.2.0 TL9          IZ11242_09.080110.epkg.Z
        5.2.0 TL10         IZ11242_10.080110.epkg.Z
        5.3.0 TL5          IZ12745_05.080110.epkg.Z
        5.3.0 TL6          IZ12745_06.080110.epkg.Z
        5.3.7              IZ11243_07.080110.epkg.Z
        6.1.0              IZ11244_00.080110.epkg.Z

        To extract the fixes from the tar file:

        tar xvf ps_ifix.tar
        cd ps_ifix

        Verify you have retrieved the fixes intact:

        The checksums below were generated using the "sum", "cksum",
        "csum -h MD5" (md5sum), and "csum -h SHA1" (sha1sum) commands
        and are as follows:

        sum         filename
        ------------------------------------
        59999    42 IZ11242_08.080110.epkg.Z
        38864    42 IZ11242_09.080110.epkg.Z
        58751    44 IZ11242_10.080110.epkg.Z
        53743    57 IZ11243_07.080110.epkg.Z
        06072    64 IZ11244_00.080110.epkg.Z
        28757    56 IZ12745_05.080110.epkg.Z
        46095    57 IZ12745_06.080110.epkg.Z

        cksum             filename
        ------------------------------------------
        3753955418 42918 IZ11242_08.080110.epkg.Z
        656903653  42924 IZ11242_09.080110.epkg.Z
        3128991594 44510 IZ11242_10.080110.epkg.Z
        2217046042 58015 IZ11243_07.080110.epkg.Z
        4248777175 64931 IZ11244_00.080110.epkg.Z
        2572937489 56417 IZ12745_05.080110.epkg.Z
        2883305420 58229 IZ12745_06.080110.epkg.Z

        csum -h MD5 (md5sum)              filename
        ----------------------------------------------------------
        72b7caf42d62b438c678e27b053dd80a  IZ11242_08.080110.epkg.Z
        139afb750077e7006017a931f2126ae1  IZ11242_09.080110.epkg.Z
        02b8a618b122b10c7a19d380aca5be9c  IZ11242_10.080110.epkg.Z
        5b68cd5246cdedbf43c1e76a9d89a027  IZ11243_07.080110.epkg.Z
        2822aac0854e313aabbf995d303164d9  IZ11244_00.080110.epkg.Z
        b2d7d7d6d7521e9da97d76717f58eb6e  IZ12745_05.080110.epkg.Z
        a4691536c95383269ddfdc36534df353  IZ12745_06.080110.epkg.Z

        csum -h SHA1 (sha1sum)                    filename
        ------------------------------------------------------------------
        7c8382e31fc29c00b48f1d861b48e61424a8f8d5  IZ11242_08.080110.epkg.Z
        7fcb56363ba3f67525949b49b598654fcf0e99ec  IZ11242_09.080110.epkg.Z
        0c2cf89f03c2d3ec7ee931ef5fad1cae2d1b1025  IZ11242_10.080110.epkg.Z
        edffff38b42a068a40854f78ad9dbe24daabad40  IZ11243_07.080110.epkg.Z
        ab7c528a8f851410835640edef9d4457b41a8ba7  IZ11244_00.080110.epkg.Z
        c6bd4e3e40c0c2c8bbdc79cd569799e7baf4df5a  IZ12745_05.080110.epkg.Z
        acfa10d0c5e24e8f6b00a898d114e1bb2b560412  IZ12745_06.080110.epkg.Z

        To verify the sums, use the text of this advisory as input to
        csum, md5sum, or sha1sum. For example:

        csum -h SHA1 -i Advisory.asc
        md5sum -c Advisory.asc
        sha1sum -c Advisory.asc

        These sums should match exactly. The PGP 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.

    C. 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.

        Interim fixes have had limited functional and regression
        testing but not the full regression testing that takes place
        for Service Packs; thus, IBM does not warrant the fully
        correct functionality of an interim fix.

        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.

VI. WORKAROUNDS

    There are no workarounds available.

VII. OBTAINING FIXES

    AIX security related fixes can be downloaded from:

        ftp://aix.software.ibm.com/aix/efixes/security

    AIX fixes can be downloaded from:

        http://www.ibm.com/eserver/support/fixes/fixcentral/main/pseries/aix

    NOTE: Affected customers are urged to upgrade to the latest
    applicable Technology Level and Service Pack.

VIII. CONTACT INFORMATION

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

        http://www14.software.ibm.com/webapp/set2/subscriptions/pqvcmjd
 
    Comments regarding the content of this announcement can be
    directed to:

        security-alert@austin.ibm.com

    To request the PGP public key that can be used to communicate
    securely with the AIX Security Team you can either:

        A. Send an email with "get key" in the subject line to:

            security-alert@austin.ibm.com

        B. Download the key from a PGP Public Key Server. The key ID is:

            0xA6A36CCC

    Please contact your local IBM AIX support center for any
    assistance.

    eServer is a trademark of International Business Machines
    Corporation.  IBM, AIX and pSeries are registered trademarks of
    International Business Machines Corporation.  All other trademarks
    are property of their respective holders.

IX. ACKNOWLEDGMENTS

    Andrea "bunker" Purificato reported this vulnerability.


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Version: GnuPG v1.4.7 (AIX)

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-----END PGP SIGNATURE-----
 
 


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