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Category:   OS (UNIX)  >   AIX Vendors:   IBM
IBM AIX Buffer Overflow in fileplace Command Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1018550
SecurityTracker URL:  http://securitytracker.com/id/1018550
CVE Reference:   CVE-2007-4354   (Links to External Site)
Updated:  Aug 15 2007
Original Entry Date:  Aug 10 2007
Impact:   Execution of arbitrary code via local system, Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.2, 5.3
Description:   A vulnerability was reported in AIX. A local user can obtain root privileges on the target system.

A local user can trigger a buffer overflow in the fileplace command to execute arbitrary code with root privileges on the target system.

IBM discovered this vulnerability.

Impact:   A local user can obtain root privileges on the target system.
Solution:   The vendor has issued the following APARs.

For 5.2.0: IZ00154
For 5.3.0: IZ00149

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

Message History:   None.


 Source Message Contents

Date:  Fri, 10 Aug 2007 15:46:43 -0400
Subject:  IBM


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

IBM SECURITY ADVISORY

First Issued: Tue Aug  7 17:36:53 CDT 2007
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX fileplace Command 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 with root privileges.

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

I. OVERVIEW

    The fileplace command displays the placement of a specified file within the
    logical or physical volumes containing the file.

II. DESCRIPTION

    A buffer overflow vulnerability exists in the fileplace command whereby a
    local user may 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.perf.tools

    The following filesets levels are vulnerable:

    AIX Level           Lower Level       Upper Level
    -------------------------------------------------
    5.2.0               5.2.0.0           5.2.0.105
    5.3.0               5.3.0.0           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               IZ00154           Available
        5.3.0               IZ00149           Available

        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/fileplace_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
        ---------------------------------------------------------------
        5300-04                                IZ00149_04.070614.epkg.Z
        5300-05                                IZ00149_05.070614.epkg.Z
        5300-06                                IZ00149_06.070614.epkg.Z
        5200-08                                IZ00154_08.070614.epkg.Z
        5200-09                                IZ00154_09.070614.epkg.Z
        5200-10                                IZ00154_10.070614.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
        ----------------------------------------------------------------------
        IZ00149_04.070614.epkg.Z   07905 17   7fb600f44737f788f0a79fb6c4235172
        IZ00149_05.070614.epkg.Z   40169 17   d8039bd0a0a253b0d52feaaa94c480a0
        IZ00149_06.070614.epkg.Z   17005 17   d09b183dc32689b7b7b53e26bac24233
        IZ00154_08.070614.epkg.Z   37336 17   e6568799884262a5c7620fd9171ae546
        IZ00154_09.070614.epkg.Z   19912 17   b816616774d66acb565403282823e3d7
        IZ00154_10.070614.epkg.Z   10830 17   98f71db66ed488d2528de7907c45b08f

        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 several workarounds, which may be implemented.

    A. OPTION 1

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

        # rm -f /usr/bin/fileplace

        NOTE:To restore this command, the entire bos.perf.tools package must be
        reinstalled.

    B. OPTION 2

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

        # chmod 500 /usr/bin/fileplace

        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 many SUID commands.

        The fileplace command is addressed by the medium and high fpm
        databases.

    D. OPTION 3

        Stack execution disable may be enabled on machines running AIX 5.3 TL05
        or later.

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 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:

            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

    This vulnerability was discovered internal to IBM as part of its
    commitment to securing the AIX operating system.


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