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IBM SECURITY ADVISORY

First Issued: Thu Apr 22 15:17:51 CDT 2004

===========================================================================
                            VULNERABILITY SUMMARY

VULNERABILITY:      symlink and buffer overflow vulnerabilities in LVM
                     commands

PLATFORMS:          AIX 5.1 and 5.2.

SOLUTION:           Apply the efixes or APARs as described below.

THREAT:             A local attacker may cause data destruction or a denial
                     of service.
                     A local attacker with system group privileges may
                     execute arbitrary code.

CERT VU Number:     N/A
CVE Number:         N/A
===========================================================================
                            DETAILED INFORMATION


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

A symlink vulnerability was discovered in some LVM commands that
allow an attacker to overwrite arbitrary system files. This could lead to
data destruction or a denial of service. These issues were discovered
internally; at this time there are no known exploits in the wild.

Buffer overflow vulnerabilities were discovered in the putlvcb and
getlvcb commands. These commands are used by high level LVM commands
to modify and query the Logical Volume Control Block. To exploit these
issues, an attacker must have system group privileges. There are known
exploits for this issue.

The commands affected by these issues ship as part of the bos.rte.lvm fileset.
To determine if this fileset is installed, execute the following command:

# lslpp -L bos.rte.lvm

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


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

A local attacker may cause data destruction or a denial of service.
A local attacker with system group privileges may execute arbitrary code.


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

A. Official Fix

IBM provides the following fixes:

       APAR number for AIX 5.1.0:  IY55681 (available approx. 06/02/04)
       APAR number for AIX 5.2.0:  IY55682 (available approx. 05/19/04)

NOTE: Affected customers are urged to upgrade to 5.1.0 or 5.2.0 at
the latest maintenance level.

B. Emergency Fix

Efixes are available for AIX 5.1.0 and 5.2.0. The efixes can be
downloaded via ftp from:

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

lvmcmd_efx.tar.Z is a compressed tarball containing this advisory, two
efix packages for 5.1.0 and 5.2.0 and cleartext PGP signatures for
each efix package.

Verify you have retrieved the efixes intact:
- --------------------------------------------
The checksums below were generated using the "sum" and "md5sum" commands
and are as follows:


Filename                 sum          md5
======================================================================
lvmcmd51.040422.epkg.Z   20723   485  d6016788254e40377304208870e1e54a
lvmcmd52.040422.epkg.Z   49794   542  e5ec42cb05641643fce249663f75f377

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.

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

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

Efix Installation Instructions:
- -------------------------------
The efix package for AIX 5.1.0 and 5.2.0 are named lvmcmd51.040422.epkg.Z and
lvmcmd52.040422.epkg.Z respectively.

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

      http://techsupport.services.ibm.com/server/aix.efixmgmt

To preview an epkg efix installation execute the following command:

# emgr -e epkg_name -p       # where epkg_name is the name of the
                              # efix package being previewed.

To install an epkg efix package, execute the following command:

# emgr -e epkg_name -X       # where epkg_name is the name of the
                              # efix package being installed.

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


IV. Obtaining Fixes
===================

AIX Version 5 APARs can be downloaded from the eServer pSeries Fix Central
web site:

      http://www-912.ibm.com/eserver/support/fixes/fcgui.jsp

Security related Emergency 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:
      https://techsupport.services.ibm.com/server/pseries.subscriptionSvcs

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 0x3AE561C3.

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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