Hash: SHA1

             AUSCERT External Security Bulletin Redistribution

                          ESB-2007.0368 -- [AIX]
  A remotely exploitable denial of service vulnerability exists in WebSM
                                31 May 2007


        AusCERT Security Bulletin Summary

Product:              Web-based System Manager (WebSM)
Publisher:            IBM
Operating System:     AIX 5.2, 5.3
Impact:               Denial of Service
Access:               Remote/Unauthenticated

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Hash: SHA1

First Issued: Tue May 22 15:27:47 CDT 2007

                           VULNERABILITY SUMMARY

VULNERABILITY:      A remotely exploitable denial of service vulnerability
                    exist in WebSM

PLATFORMS:          AIX 5.2, 5.3

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

THREAT:             A remote attacker may cause a denial of service.

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

I.  Description

Web-based System Manager (WebSM) is a system management application that
can be used to manage AIX. More information about WebSM can be found in the
"Web-based System Manager Administration Guide". WebSM is enabled by
default if "Graphics Software" is selected during install.

A remotely exploitable vulnerability exists which allows an attacker to
exhaust system memory resulting in a denial of service. This vulnerability
can be exploited if WebSM is configured in client-server mode, applet mode
or remote client mode. It cannot be exploited if using WebSM in standalone
application mode. 

To determine if WebSM is installed via the sysmgt.websm.rte fileset. To
determine if this fileset is installed, execute the following command:

# lslpp -L sysmgt.websm.rte

The following table shows which versions of sysmgt.websm.rte are

AIX Release          Lower         Upper
                     Level         Level
AIX 5.2    
AIX 5.3    

II. Impact

A remote attacker may cause a denial of service.

III.  Solutions


IBM provides the following fixes:

      APAR number for AIX 5200-09: IY95637 (available)
      APAR number for AIX 5300-05: IY95619 (available approx. 05/23/07)

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


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

Filename                   sum           md5
IY95637_07.070329.epkg.Z   19129    19   ce9e3f58d5a6ecac559074e8daa0677c
IY95637_08.070329.epkg.Z   10118    20   74c2032115bacb98136bf4d483ace1d4
IY95637_09.070329.epkg.Z   17030    20   83b98d597d8f9b94717ff377deae0bbf
IY95526_03.070329.epkg.Z   37006    20   5df2e8dd0ff7994c2b627478e04026a7
IY95526_04.070329.epkg.Z   25193    20   e3fd40c267cb3d60234cf6f9aae3abbf
IY95526_05.070329.epkg.Z   01716    20   a7ca477b73ab6217a8bed1073b2e6dbe

See the table below to determine which AIX Technology Level a given interim
fix maps to.

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 levels show are for both sysmgt.websm.rte and

Interim                    Fileset Level     Fileset Level   AIX
Fix                        (lower level)     (upper level)   Level
IY95637_07.070329.epkg.Z        5200-07
IY95637_08.070329.epkg.Z        5200-08
IY95637_09.070329.epkg.Z        5200-09
IY95526_03.070329.epkg.Z        5300-03
IY95526_04.070329.epkg.Z        5300-04
IY95526_05.070329.epkg.Z        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

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

Interim Installation Instructions:
These packages use the new Interim Fix Management Solution to install and
manage interim fixes. More information can be found at:


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

If WebSM is not being used, it can be turned off using the wsmserver
command as follows:

# /usr/websm/bin/wsmserver -disable

IV. Obtaining Fixes

AIX Version 5 APARs can be downloaded from:


Security related Interim Fixes can be downloaded from:


V.  Contact Information

If you would like to receive AIX Security Advisories via email, please


Comments regarding the content of this announcement can be directed to:


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 0x092546E5.

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
Version: GnuPG v1.4.6 (GNU/Linux)


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