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Category:   Application (Generic)  >   BIND Vendors:   ISC (Internet Software Consortium)
IBM AIX named8 Lets Local Users Gain Root Privileges
SecurityTracker Alert ID:  1016925
SecurityTracker URL:  http://securitytracker.com/id/1016925
CVE Reference:   CVE-2006-5003   (Links to External Site)
Updated:  Jun 3 2008
Original Entry Date:  Sep 26 2006
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 8
Description:   A vulnerability was reported in named8 on IBM AIX. A local user can gain root privileges.

A local user in the system group can execute arbitrary commands on the target system with root privileges.

The 'bos.net.tcp.server' fileset is affected.

[Editor's note: It is unclear whether other implementations of BIND are affected or if this vulnerability only affects the IBM AIX implementation.]

Impact:   A local user can obtain root privileges on the target system.
Solution:   IBM has issued the following fixes:

APAR number for AIX 5.2.0: IY76102 (available)
APAR number for AIX 5.3.0: IY76483 (available)

Interim fixes are available at:

ftp://aix.software.ibm.com/aix/efixes/security/named8_ifix.tar.Z

Vendor URL:  www.ibm.com/ (Links to External Site)
Cause:   Not specified
Underlying OS:   UNIX (AIX)

Message History:   None.


 Source Message Contents

Date:  Mon, 25 Sep 2006 20:55:53 -0400
Subject:  IBM AIX named8 vulnerability


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

IBM SECURITY ADVISORY

First Issued: Mon Sep 25 10:00 CDT 2006
==========================================================================
                           VULNERABILITY SUMMARY

VULNERABILITY:      A vulnerability in named8 may allow a user in the
		    system group to execute arbitrary commands with root
		    privileges.

PLATFORMS:          AIX 5.2 and 5.3.

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

THREAT:             A local user in the system group may execute arbitrary
                    commands as root

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


I.  Description
===============

Berkeley Internet Name Domain 8 (BIND 8) is a Domain Name System (DNS)
distribution from the Internet Systems Consortium (ISC) and it is included
with AIX 5.2 and 5.3. A security vulnerability was discovered in named8
which may allow a local user in the system group to execute arbitrary code
with root privileges.

named8 ships as part of the bos.net.tcp.server fileset. To determine if
this fileset is installed, execute the following command:

# lslpp -L bos.net.tcp.server

If the fileset is installed it will be listed along with its version
information, state, type and a description.

The following table shows the vulnerable versions of bos.net.tcp.server. 

AIX Release          Lower         Upper
                     Level         Level
===========================================
AIX 5.2              5.2.0.0       5.2.0.85
AIX 5.3              5.3.0.0       5.3.0.40


II. Impact
==========

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


III.  Solutions
===============

A. APARs

IBM provides the following fixes:

      APAR number for AIX 5.2.0:  IY76102 (available)
      APAR number for AIX 5.3.0:  IY76483 (available)

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

B. Interim Fix

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

    ftp://aix.software.ibm.com/aix/efixes/security/named8_ifix.tar.Z

This is a compressed tarball containing this advisory, interim fix packages
and cleartext PGP signatures for each package.


Verify you have retrieved the fixes intact:
+------------------------------------------
The interim fixes below are named by using the APAR corresponding to the
release that the fix applies to. The APAR is followed by an underscore and
the Technology Level for the particular AIX release that a fix applies to.

The checksums below were generated using the "sum" and "md5sum" commands
and are as follows:

The interim fixes below include prerequisite checking. This will enforce
the correct mapping between the fixes and AIX Technology Levels.

Filename                   sum           md5
=========================================================================
IY76102_07.060824.epkg.Z   22728   471   2784cfd2c0437216f3222dd11b971840
IY76102_08.060824.epkg.Z   16675   472   7bc52f632c7880c50c54690bbde0d497
IY76483_03.060824.epkg.Z   37314   463   7c9480925cc629303f555609059602eb
IY76483_04.060824.epkg.Z   09427   465   d6ed5bacfbc2b194ea832a08f6cd3da6


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.

The interim fixes include prerequisite checking. This will ensure the
correct mapping between the interim fixes and AIX Technology Levels. The
following table shows the prerequisite fileset levels required for the
fixes above. The fileset levels listed are for bos.net.tcp.server.

Interim                    Fileset Level     Fileset Level
Fix                        (lower limit)     (upper limit)
===================================================================
IY76102_07.060824.epkg.Z   5.2.0.76          5.2.0.76
IY76102_08.060824.epkg.Z   5.2.0.85          5.2.0.85
IY76483_03.060824.epkg.Z   5.3.0.30          5.3.0.30
IY76483_04.060824.epkg.Z   5.3.0.40          5.3.0.40

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

Customers may contact IBM support if any issues arise with these interim
fixes.


Interim Installation Instructions:
+---------------------------------

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.

C. Workaround

Remove the setuid root bit. Note that this will prevent named8 from
functioning normally for non-root users. This can be done by executing the
following command:

# chmod 550 /usr/sbin/named8

Verify the changes:

# ls -la /usr/sbin/named8
- -r-xr-x---   1 root     system       649070 Nov 23 2004  /usr/sbin/named8

Restart named8 after applying this interim fix.

IV. 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


V.  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 0x1B14F299.

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.
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