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Category:   OS (UNIX)  >   IBM AIX Vendors:   IBM
IBM AIX Buffer Overflows in chpath, rmpath, and devinstall Commands Let Local Users Gain Root Privileges
SecurityTracker Alert ID:  1018549
SecurityTracker URL:  http://securitytracker.com/id/1018549
CVE Reference:   CVE-2007-4353   (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 elevated privileges on the target system.

A local user with system group privileges can invoke several configuration commands to trigger a buffer overflow and execute arbitrary code on the target system with root privileges.

The chpath, rmpath, and devinstall commands are affected.

IBM discovered this vulnerability.

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

For 5.2.0: IZ00531
For 5.3.0: IZ01433

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 15:29:38 -0400
Subject:  IBM AIX


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

IBM SECURITY ADVISORY

First Issued: Tue Aug  7 13:54:01 CDT 2007
===============================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:   AIX multiple buffer overflow vulnerabilities in configuration
                 commands.

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

    A. chpath

        The chpath command either changes the operational status of paths to
        the specified device (the -l Name flag) or it changes one, or more,
        attributes associated with a specific path to the specified device.

    B. rmpath

        The rmpath command deconfigures, and possibly undefines, one or more
        paths associated with the specified target device (-l Name).

    C. devinstall

        The devinstall command installs software support for devices.

II. DESCRIPTION

    The above commands are vulnerable to buffer overflow conditions and may
    allow a user in the system group to execute arbitrary code with root
    privileges.

III. IMPACT

    A user in the system group may execute arbitrary code with root privileges.

IV. PLATFORM VULNERABILITY ASSESSMENT

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

    # lslpp -l | grep bos.rte.methods

    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: The above filesets are those currently supported by IBM.  Previous
    versions of the fileset may also be vulnerable.  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               IZ00531           Available
        5.3.0               IZ01433           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/cmdcfg_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                                IZ00529_08.070807.epkg.Z
        5200-09                                IZ00529_09.070807.epkg.Z
        5200-10                                IZ00529_10.070807.epkg.Z
        5300-04                                IZ01433_04.070807.epkg.Z
        5300-05                                IZ01433_05.070807.epkg.Z
        5300-06                                IZ01433_06.070807.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
        ----------------------------------------------------------------------
        IZ00529_08.070807.epkg.Z   52115 34   e11e4c5cc37ec26fde45d80703e76e19
        IZ00529_09.070807.epkg.Z   35417 34   dd084a12d8a036b1071345ac4546c1c7
        IZ00529_10.070807.epkg.Z   30938 34   1faf9dacf204895b8489c6eeaf82ae8d
        IZ01433_04.070807.epkg.Z   56171 37   07b177ca504041214ab35f8e51e135ea
        IZ01433_05.070807.epkg.Z   44750 37   79749e131876794ee5518cfacb5c5fee
        IZ01433_06.070807.epkg.Z   16878 37   a6badd0df050513eed415c8ff14d8ff0

        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

    The following options may be used to mitigate the risk posed by this
    vulnerability in lieu of installing interim fix or APAR.

    A. OPTION 1

        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.

        All the commands addressed by this advisory can be found in the
        medium and high fpm databases.

    B. OPTION 2

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

    C. OPTION 3

        The users may manually remove the SUID bit of these commands mentioned
        above.

    Note: Some workarounds may disable functionality for some users.

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

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

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