Subject Vulnerability in IBM AIX "rmail" Date 19-Apr-96
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>> CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl. Links <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>> <<
>> CERT-NL also has stopped the CERT-CC-Mirror service. Due to this the <<
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Security Advisory CERT-NL
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Author/Source : Don Stikvoort Index : S-96-19
Distribution : World Page : 1
Classification: External Version: 1
Subject : Vulnerability in IBM AIX "rmail" Date : 19-Apr-96
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By courtesy of IBM-ERS (the IBM CERT) we received
information on a vulnerability in the IBM AIX version 3 "rmail" program.
CERT-NL recommends implementing the presented workaround immediately.
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VULNERABILITY SUMMARY
VULNERABILITY: Vulnerability in the IBM AIX "rmail" program.
PLATFORMS: AIX Version 3 (Version 4 does not contain this vulnerability).
SOLUTION: Take one of the actions described below.
THREAT: A user can gain unauthorized access to another user's mail.
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DETAILED INFORMATION
I. Description
There is a potential security exposure in the "rmail" program on Version 3
of the IBM AIX operating system.
Version 4 of AIX does not contain this vulnerability.
II. Impact
A user with knowledge of this vulnerability can exercise it to obtain
unauthorized access to another user's electronic mail.
III. Solutions
The IBM AIX Response Team recommends two solutions to this problem:
1. Log in to the workstation as "root" and issue the command:
# /usr/bin/chmod 555 /usr/bin/rmail /bin/rmail
2. Apply the following APAR to your system once the APAR is available:
APAR - IX57680
The first solution should be applied immediately to remove the vulnerability
to your system. Once the APAR is available, you should also apply the second
solution.
IV. Acknowledgements
IBM-ERS would like to thank the IBM AIX Response Team for providing the
information contained in this alert.
(Copyright 1996 International Business Machines Corporation.)
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