IRIX 3.3 and 3.31 /usr/sbin/MailOriginal issue date: October 31, 1990
Last revised: September 17, 1997
Attached Copyright statement
A complete revision history is at the end of this file.
The CERT/CC has received the following report of a vulnerability in /usr/sbin/Mail, present only in IRIX 3.3 and 3.3.1. This information was provided to the CERT/CC by Robert Stephens, of Silicon Graphics Inc.
I. Description/usr/sbin/Mail can fail to reset its group id to the group id of the caller.
II. ImpactCan allow any user logged onto the system to read any other user's (including root's) mail.
III. SolutionA fixed /usr/sbin/Mail binary has been made available for anonymous ftp from SGI.COM ([188.8.131.52]). The correct binary can be found at:
under the ftp directory.
Note that this binary must be installed with the same group (mail) and permissions (2755) as your existing 3.3 or 3.3.1 /usr/sbin/Mail.
For further questions, please contact your Silicon Graphics support center (Geometry Partners HOTLINE number: (800) 345-0222)
This document is available from: http://www.preview.cert.org/advisories/CA-1990-08.html
CERT/CC Contact Information
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh PA 15213-3890
Phone: +1 412-268-7090 (24-hour hotline)
Fax: +1 412-268-6989
CERT/CC personnel answer the hotline 08:00-17:00 EST(GMT-5) / EDT(GMT-4) Monday through Friday; they are on call for emergencies during other hours, on U.S. holidays, and on weekends.
We strongly urge you to encrypt sensitive information sent by email. Our public PGP key is available from
If you prefer to use DES, please call the CERT hotline for more information.
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Copyright 1990 Carnegie Mellon University.
September 17,1997 Attached Copyright Statement