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IBM SECURITY ADVISORY
 
 
First Issued: Mon Sep 25 10:00 CDT 2006
==========================================================================
                           VULNERABILITY SUMMARY
 
VULNERABILITY:      Arbitrary file overwrite vulnerability in 
                    invscoutClient_VPD_Survey
 
PLATFORMS:          Inventory Scout 2.2 for AIX 5.2 and AIX 5.3
 
SOLUTION:           Apply the APAR, interim fix or workaround as
                    described below.
 
THREAT:             A local user may overwrite an arbitrary file
 
CERT VU Number:     n/a
CVE Number:         n/a
=========================================================================
                           DETAILED INFORMATION
 
 
I.  Description
===============
 
A security vulnerability was discovered in invscoutClient_VPD_Survey that
may allow a local user to overwrite an arbitrary file.
invscoutClient_VPD_Survey is used by Inventory Scout when performing a
survey of the Vital Product Database.
 
This issue pertains to Inventory Scout 2.2.0.0 through 2.2.0.9.
invscoutClient_VPD_Survey is shipped as part of invscout.rte. To determine
which version of invscout.rte is installed, execute the following command:
 
# lslpp -L invscout.rte
 
If the fileset is installed it will be listed along with its version
information, state, type and a description.
 
 
II. Impact
==========
 
A local user may overwrite an arbitrary file resulting in a denial of
service.
 
 
III.  Solutions
===============
 
A. Official Fix
 
IBM provides the following fixes:
 
      APAR number for AIX 5.2.0: IY88735 (available approx. 10/04/2006)
      APAR number for AIX 5.3.0: IY88735 (available approx. 10/04/2006)
 
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/invscoutClient_VPD_Survey.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
=========================================================================
IY88735_07.060823.epkg.Z   56011  2199   c45ffb7dbc38f59929b782f12143ff21
IY88735_08.060823.epkg.Z   13326  2201   5e191eda1dd5ce17b7baf457f2b7344a
IY88735_09.060823.epkg.Z   39824  2201   284b0576b3e9dda66dc0f20dc47913d6
IY88735_03.060823.epkg.Z   21700  2199   d56929d46a38fdd41b4c585a4206d15a
IY88735_04.060823.epkg.Z   49777  2207   c4cb368d4107b6ea5d3904f238577a6c
IY88735_05.060823.epkg.Z   16178  2199   b4e3c09950cc33a1f4b6021dcc5c5036
 
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 following table shows the prerequisite lower and upper fileset levels
for the fixes above. It also lists the Technology Level each fix should be
applied to. These levels are inclusive and apply to invscout.rte. 
 
Filename                    Lower Level     Upper Level    Technology Level
==========================================================================
IY88735_07.060823.epkg.Z    2.2.0.1         2.2.0.9        5200-07
IY88735_08.060823.epkg.Z    2.2.0.1         2.2.0.9        5200-08
IY88735_09.060823.epkg.Z    2.2.0.1         2.2.0.9        5200-09
IY88735_03.060823.epkg.Z    2.2.0.1         2.2.0.9        5300-03
IY88735_04.060823.epkg.Z    2.2.0.1         2.2.0.9        5300-04
IY88735_05.060823.epkg.Z    2.2.0.1         2.2.0.9        5300-05
 
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 bit from invscoutClient_VPD_Survey. This can be done as
follows:
 
# chmod 555 /opt/IBMinvscout/bin/invscoutClient_VPD_Survey
 
Verify the changes:
 
# ls -la /opt/IBMinvscout/bin/invscoutClient_VPD_Survey
- -r-xr-xr-x   1 root     system     11755683 Feb 11 2005
/opt/IBMinvscout/bin/invscoutClient_VPD_Survey
 
Note that this may prevent invscoutClient_VPD_Survey from functioning
normally for non-root users.
 
 
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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