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             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0566 -- [AIX]
 AIX capture Terminal Control Sequence Stack Buffer Overflow Vulnerability
                               27 July 2007

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

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              capture(1)
Publisher:            IBM
Operating System:     AIX 5.2, 5.3
Impact:               Root Compromise
Access:               Existing Account
CVE Names:            CVE-2007-3333

Original Bulletin:    
  http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=570

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IBM SECURITY ADVISORY

First Issued: Mon Jul 23 16:13:01 CDT 2007
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX capture Terminal Control Sequence Stack Buffer Overflow
                 Vulnerability

PLATFORMS:       AIX 5.2, 5.3

SOLUTION:        Apply the APAR, interim fix or workaround as described
                 below.

THREAT:          An attacker may run arbitrary code as root privileges.

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

I. OVERVIEW

    The capture command allows a user to dump everything printed on the
    user's terminal to a file.  Capture is a setuid program installed by
    default.

II. DESCRIPTION

    A buffer overflow vulnerability exists within the capture command, which
    allows a local attacker to execute arbitrary code with root privileges.

III. IMPACT

    The successful exploitation of this vulnerability allows a non-privileged
    user to execute code with root privileges.

IV. PLATFORM VULNERABILITY ASSESSMENT

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

    # lslpp -l | grep bos.rte.shell

    The following filesets are vulnerable:

    AIX Level           Lower Level       Upper Level
    -------------------------------------------------
    5.2.0               5.2.0.85          5.2.0.105
    5.3.0               5.3.0.40          5.3.0.61

    NOTE: IBM only supports the latest two releases (AIX 5.2 & 5.3) and the
    latest three Technology Levels (AIX 5.2 TL08, TL09, TL10 & AIX 5.3 TL04,
    TL05, TL06).  Affected customers are urged to upgrade to the latest
    applicable Technology Level and Service Pack.

V. SOLUTIONS

    A. APARS

        IBM provides the following fixes:

        AIX Level           APAR number       Availability
        --------------------------------------------------------------------
        5.2.0               IZ01134           10/31/2007 (subject to change)
        5.3.0               IZ01135           11/27/2007 (subject to change)

        AIX Version 5 APARs can be downloaded from:

        http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html

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

    B. INTERIM FIXES

        Interim fixes are available.  The interim fix can be downloaded via
        ftp from:

        ftp://aix.software.ibm.com/aix/efixes/security/capture_ifix.tar.Z

        This is a compressed tarball containing this advisory, interim fix
        packages and PGP signatures for each package.  The interim fixes below
        include prerequisite checking. This will enforce the correct mapping
        between the fixes and AIX Technology Levels.

        AIX Release & Technology Level         Interim fix
        ---------------------------------------------------------------
        5200-08                                IZ01135_08.070706.epkg.Z
        5200-09                                IZ01135_09.070706.epkg.Z
        5200-10                                IZ01135_10.070706.epkg.Z
        5300-04                                IZ01134_04.070706.epkg.Z
        5300-05                                IZ01134_05.070706.epkg.Z
        5300-06                                IZ01134_06.070706.epkg.Z

        IMPORTANT: If possible, it is recommended that a mksysb backup of the
        system be created.  Verify it is both bootable and readable before
        proceeding.

        These interim fixes have not been fully regression tested; thus, IBM
        does not warrant the fully correct functionality of the interim fix.
        Customers install the interim fix and operate the modified version of
        AIX at their own risk.

        Verify you have retrieved the fixes intact:

        The interim fixes below are named by using the technology level
        corresponding to the release that the fix applies to. The checksums
        below were generated using the "sum" and "md5sum" commands and are as
        follows:

        Filename                   sum        md5sum
        ----------------------------------------------------------------------
        IZ01135_08.070706.epkg.Z   33065 17   359273b73c72b9ea4f7e0cb946229019
        IZ01135_09.070706.epkg.Z   32117 17   b588488fd4d3ab00947db2b703850261
        IZ01135_10.070706.epkg.Z   55625 17   89beccaa8a7c20c3e52feaca6a10956d
        IZ01134_04.070706.epkg.Z   31677 18   d5b31946b4abba3b086cb6e8b90b8144
        IZ01134_05.070706.epkg.Z   10938 18   7e2c7b7c2c82e7d53ce37d3c003f11e4
        IZ01134_06.070706.epkg.Z   30448 18   febbec7814c42d6a66409c5fd6124d7b

        These sums should match exactly. The PGP signatures in the
        compressed tarball and on this advisory can also be used to verify
        the integrity of the various files they correspond to.  If the sums
        or signatures cannot be confirmed, double check the command results
        and the download site address.  If those are OK, contact IBM AIX
        Security at security-alert@austin.ibm.com and describe the
        discrepancy.

    C. INTERIM FIX INSTALLATION

        These packages use the new Interim Fix Management Solution to install
        and manage interim fixes.  More information can be found at:

        http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html

        To preview an epkg interim fix installation execute the following
        command:

        # emgr -e ipkg_name -p       # where ipkg_name is the name of the
                                     # interim fix package being previewed.

        To install an epkg interim fix package, execute the following command:

        # emgr -e ipkg_name -X       # where ipkg_name is the name of the
                                     # interim fix package being installed.

        The "X" flag will expand any filesystems if required.

VI. WORKAROUNDS

    There are a couple of workarounds that may be implemented.

    A. OPTION 1

        If the program is unnecessary, it may be removed with the following
        command:

        # rm -f /usr/bin/capture

        NOTE: To restore this command, the entire bos.rte.shell package must be
        reinstalled.

    B. OPTION 2

        Change the permissions of this program to remove the setuid bit with
        the following command:

        #chmod 500 /usr/bin/capture

        NOTE: This will disable functionality of the command for all users
        except root.

    C. OPTION 3

        Customers running AIX 5.3.0 TL06 may install the bos.rte.security
        fileset and take advantage of the 'fpm' command to disable the setuid
        capabilities of 'capture'.  The 'capture' command is disabled in the
        high level database.

        NOTE: This will disable functionality of the command for all users
        except root.

VII. OBTAINING FIXES

    AIX Version 5 APARs can be downloaded from:

        http://www.ibm.com/servers/eserver/support/unixservers/aixfixes.html

    Security related Interim Fixes can be downloaded from:

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

VII. 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 send email to
    security-alert@austin.ibm.com with a subject of "get key". The key
    can also be downloaded from a PGP Public Key Server. The key id is
    0x4265D862.

    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.

VIII. ACKNOWLEDGMENTS

    iDefense (http://labs.idefense.com/) credits an anonymous contributer.

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