Published:
08 January 1998
Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-98.003 -- IBM-ERS Security Vulnerability Alert
The AIX "routed" daemon allows remote users to modify system files.
9 January 1998
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The IBM Emergency Response Service has released the following alert
concerning a vulnerability in the "routed" daemon. This vulnerability
may allow remote users to modify system files which may allow remote access
to the system. An exploit script for this vulnerability has been made
publicly available.
The following security bulletin is provided as a service to AUSCERT's
members. As AUSCERT did not write this document, AUSCERT has had no
control over its content. As such, the decision to use any or all of this
information is the responsibility of each user or organisation, and should
be done so in accordance with site policies and procedures.
NOTE: This is only the original release of the security bulletin. It will
not be updated when the original bulletin is. If downloading at a later
date, it is recommended that the bulletin is retrieved from the original
authors to ensure that the information is still current.
Contact information for IBM-ERS is included in the Security Bulletin below.
If you have any questions or need further information, please contact them
directly.
Previous advisories and external security bulletins can be retrieved from:
http://www.auscert.org.au/Information/advisories.html
If you believe that your system has been compromised, contact AUSCERT or your
representative in FIRST (Forum of Incident Response and Security Teams).
Internet Email: auscert@auscert.org.au
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AUSCERT personnel answer during Queensland business hours
which are GMT+10:00 (AEST).
On call after hours for emergencies.
Facsimile: (07) 3365 7031
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EMERGENCY RESPONSE SERVICE
SECURITY VULNERABILITY ALERT
08 January 1998 20:30 GMT Number: ERS-SVA-E01-1998:001.1
===============================================================================
VULNERABILITY SUMMARY
VULNERABILITY: The "routed" daemon allows remote users to modify system
files.
PLATFORMS: IBM AIX(r) 3.2.x, 4.1.x, 4.2.x, 4.3.x
SOLUTION: Apply the fixes listed below.
THREAT: Remote users can gain system access.
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DETAILED INFORMATION
I. Description
The "routed" daemon accepts packets that cause arbitrary system files to be
created and/or modified. Only machines running the routed daemon are
vulnerable.
An exploit script has been made publicly available.
II. Impact
Remote users can modify system files which can allow remote access to the
system.
III. Solutions
A. How to alleviate the problem
A temporary fix is available via anonymous ftp from:
ftp://testcase.software.ibm.com/aix/fromibm/security.routed.tar.Z
Filename sum md5
=================================================================
routed 59682 40 1aae6cf116ae84f8bee91b96736b7d23
Use the following steps (as root) to install the temporary fix:
1. Uncompress and extract the fix:
# uncompress < security.routed.tar.Z | tar xf -
2. Execute the following commands to replace the vulnerable routed
binary:
# cp /usr/sbin/routed /usr/sbin/routed.orig
# chmod -x /usr/sbin/routed.orig
# cp routed/routed /usr/sbin/routed
# chmod 554 /usr/sbin/routed
NOTE: This temporary fix has not been fully regression tested.
B. Official fix
IBM is currently working on the following APARs but they are not yet
available.
AIX 4.3.x: IX73951
AIX 4.2.x: IX73949
AIX 4.1.x: IX73948
AIX 3.2.x: upgrade to version 4
IV. 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://service.software.ibm.com/aixsupport/
or send electronic mail to "aixserv@austin.ibm.com" with the word "FixDist" in
the "Subject:" line.
V. Acknowledgements
Thanks to www.rootshell.com for bringing this problem to our attention.
VI. Contact Information
Comments regarding the content of this announcement can be directed to the 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.
===============================================================================
IBM's Internet Emergency Response Service (IBM-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, IBM-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 Recovery Services organization, the IBM Internet
Emergency Response Service is a component of IBM's SecureWay(tm) line of
security products and services. From hardware to software to consulting,
SecureWay solutions can give you the assurance and expertise you need to
protect your valuable business resources. To find out more about the IBM
Internet Emergency Response Service, send an electronic mail message to
ers-sales@vnet.ibm.com, or call 1-800-742-2493 (Prompt 4).
IBM-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.
IBM-ERS uses Pretty Good Privacy* (PGP*) as the digital signature mechanism for
security vulnerability alerts and other distributed information. The IBM-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.
IBM-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.
Copyright 1998 International Business Machines Corporation.
The information in this document is provided as a service to customers of
the IBM Emergency Response Service. Neither International Business Machines
Corporation, Integrated Systems Solutions Corporation, nor any of their
employees, makes any warranty, express or implied, or assumes any legal
liability or responsibility for the accuracy, completeness, 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.
The material in this security alert may be reproduced and distributed,
without permission, in whole or in part, by other security incident response
teams (both commercial and non-commercial), provided the above copyright is
kept intact and due credit is given to IBM-ERS.
This security alert may be reproduced and distributed, without permission,
in its entirety only, by any person provided such reproduction and/or
distribution is performed for non-commercial purposes and with the intent of
increasing the awareness of the Internet community.
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