TUCoPS :: Unix :: Various Flavours :: ciacg019.txt

IBM AIX Rmail Vulnerability


                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
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                             INFORMATION BULLETIN

                          IBM AIX rmail Vulnerability

April 16, 1996 20:00 GMT                                           Number G-19
PROBLEM:       A problem in the IBM AIX "rmail" program. 
PLATFORM:      AIX Version 3 (Version 4 does not contain this vulnerability). 
DAMAGE:        A user can gain unauthorized access to another user's mail. 
SOLUTION:      Implement the recommended solutions described below. 
VULNERABILITY  Knowledge of how to exploit this vulnerability is becoming 
ASSESSMENT:    widely known. 

CIAC has obtained information from IBM-ERS pertaining to an IBM AIX rmail 
vulnerability. CIAC recommends that you apply the two solutions mention in 
the IBM Bulletin.
[ Start of IBM Bulletin ]

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                           EMERGENCY RESPONSE SERVICE

16 April 1996 16:00 GMT                          Number: ERS-SVA-E01-1996:003.1
                             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.

                              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

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.

[ End of IBM Bulletin ]


CIAC wishes to acknowledge the contributions of IBM Emergency Response Service
(IBM-ERS) for the information contained in this bulletin.

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy (DOE) and the
National Institute of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding member of
FIRST, the Forum of Incident Response and Security Teams, a global organization
established to foster cooperation and coordination among computer security 
teams worldwide.
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