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AUSCERT External Security Bulletin Redistribution
ESB-2000.105 -- IBM Outside Advisory ERS-OAR-E01-2000:087.1
Filesystem vulnerability in AIX
25 May 2000
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AusCERT Security Bulletin Summary
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Product: AIX Filesystem
Vendor: IBM
Operating System: AIX 3.2.x
AIX 4.1.x
AIX 4.2.x
AIX 4.3.x
Platform: N/A
Impact: Modify Arbitrary files
Access Required: Local
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IBM
EMERGENCY RESPONSE SERVICE
OUTSIDE ADVISORY REDISTRIBUTION
19 May 2000 14:30 GMT Number:
ERS-OAR-E01-2000:087.1
===============================================================================
The ERS Outside Advisory Redistribution is designed to provide customers
of the IBM Emergency Response Service with access to the security
advisories
sent out by other computer security incident response teams, vendors, and
other groups concerned about security.
IBM makes no representations and assumes no responsibility for the contents
or
accuracy of the advisories themselves.
ERS is forwarding the following information from IBM. Contact
information for IBM is included in the forwarded text below; please
contact them if you have any questions or need further information.
===============================================================================
********************** FORWARDED INFORMATION STARTS HERE
**********************
VULNERABILITY SUMMARY
VULNERABILITY: Filesystem vulnerability in AIX
PLATFORMS: IBM AIX(r) versions 3.2.x, 4.1.x, 4.2.x, 4.3.x
SOLUTION: Apply the fixes listed below.
THREAT: Non-privileged local users can gain write access
to some files.
===========================================================================
DETAILED INFORMATION
I. Description
Local users could gain write access to some files on local or remotely
mounted AIX filesystems, even though the file permissions do not allow
write access. This vulnerability was discovered in the IBM laboratory
during analysis of filesystem behavior and is not exposed during normal
system operation.
II. Impact
A local user could gain write access to some files on local or remotely
mounted AIX filesystems, even though the file permissions do not allow
write access.
III. Solutions
A. Official fix
The following fixes can be obtained from the AIX Fix Distribution
Service at the following URL:
http://techsupport.services.ibm.com/rs6k/fixes.html
AIX 3.2.x: APAR IY10111
AIX 4.1.x: APAR IY10031
AIX 4.2.x: APAR IY10001
AIX 4.3.x: APAR IY09941
In addition, an emergency fix specifically built to install on AIX
4.3.2 systems is available at the following URL:
ftp://aix.software.ibm.com/aix/efixes/iy09941
IV. Acknowledgements
Thanks to Pat Barrett and Dave Larson for bringing this problem to our
attention.
V. Obtaining Fixes
IBM AIX APARs may be ordered using Electronic Fix Distribution (via the
FixDist program), or from the IBM Support Center. For more information
on FixDist, and to obtain fixes via the Internet, please reference
http://techsupport.services.ibm.com/support/rs6000.support/downloads
or send electronic mail to "aixserv@austin.ibm.com" with the word
"FixDist" in the "Subject:" line. To facilitate ease of ordering all
security related APARs for each AIX release, security fixes are
periodically bundled into a cumulative APAR. For more information on
these cumulative APARs including last update and list of individual
fixes, send electronic mail to "aixserv@austin.ibm.com" with the word
"subscribe Security_APARs" in the "Subject:" line.
VI. Contact Information
Comments regarding the content of this announcement can be directed to
your local IBM support center or to:
security-alert@austin.ibm.com
To request the PGP public key that can be used to encrypt new AIX
security vulnerabilities, send email to security-alert@austin.ibm.com
with a subject of "get key".
If you would like to subscribe to the AIX security newsletter, send a
note to aixserv@austin.ibm.com with a subject of "subscribe Security".
To cancel your subscription, use a subject of "unsubscribe Security".
To see a list of other available subscriptions, use a subject of "help".
IBM and AIX are a registered trademark of International Business
Machines Corporation. All other trademarks are property of their
respective holders.
*********************** FORWARDED INFORMATION ENDS HERE
***********************
===============================================================================
IBM's Internet Emergency Response Service (ERS) is a subscription-based
Internet security response service that includes computer security incident
response and management, regular electronic verification of your Internet
gateway(s), and security vulnerability alerts similar to this one that are
tailored to your specific computing environment. By acting as an extension
of your own internal security staff, ERS's team of Internet security
experts helps you quickly detect and respond to attacks and exposures
across
your Internet connection(s).
As a part of IBM's Business Continuity and Recovery Service IBM's Emergency
Response Service is a component of IBM Global Services Privacy and Security
Services suite of offerings. To find out more about the IBM Emergency
Response
Service, send an electronic mail message to ers-sales@ers.ibm.com, or call
1-800-426-7378.
ERS maintains a site on the World Wide Web at http://www.ers.ibm.com/.
Visit the site for information about the service, copies of security
alerts,
team contact information, and other items.
ERS uses Pretty Good Privacy* (PGP*) as the digital signature mechanism for
security vulnerability alerts and other distributed information. The ERS
PGP* public key is available from
http://www.ers.ibm.com/team-info/pgpkey.html.
"Pretty Good Privacy" and "PGP" are trademarks of Philip Zimmermann.
ERS is a Member Team of the Forum of Incident Response and Security Teams
(FIRST), a global organization established to foster cooperation and
response
coordination among computer security teams worldwide.
The information in this document is provided as a service to customers of
the IBM Emergency Response Service. Neither International Business
Machines
Corporation, nor any of its employees, makes any warranty, express or
implied,
or assumes any legal liability or responsibility for the accuracy,
complete-
ness, or usefulness of any information, apparatus, product, or process
contained herein, or represents that its use would not infringe any
privately
owned rights. Reference herein to any specific commercial products,
process,
or service by trade name, trademark, manufacturer, or otherwise, does not
necessarily constitute or imply its endorsement, recommendation or favoring
by IBM or its subsidiaries. The views and opinions of authors expressed
herein do not necessarily state or reflect those of IBM or its
subsidiaries,
and may not be used for advertising or product endorsement purposes.
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