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S-96-19.asc

S-96-19.asc
Posted Jan 10, 2000

Subject Vulnerability in IBM AIX "rmail" Date 19-Apr-96

systems | aix
SHA-256 | dd48f75bfbe8297d3d56da364d6e4eca6c518ac6c7f06b7012ea049805f798f4

S-96-19.asc

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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 to CERT-NL information contained in this advisory are therefore outdated.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 <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the <<
>> complete CERT-CC advisory texts: http://www.cert.org <<
===============================================================================
===============================================================================
Security Advisory CERT-NL
===============================================================================
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
===============================================================================

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.

==============================================================================


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
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.)


==============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

Email: cert-nl@surfnet.nl ATTENDED REGULARLY ALL DAYS
Phone: +31 302 305 305 BUSINESS HOURS ONLY
Fax: +31 302 305 329 BUSINESS HOURS ONLY
Snailmail: SURFnet bv
Attn. CERT-NL
P.O. Box 19035
NL - 3501 DA UTRECHT
The Netherlands

NOODGEVALLEN: 06 22 92 35 64 ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64 ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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