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CERT Advisory 026
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CA-91:08 CERT Advisory
May 23, 1991
AT&T System V Release 4 /bin/login Vulnerability
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The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a security vulnerability in AT&T's UNIX(r)
System V Release 4 operating system. AT&T is providing a software upgrade
for Release 4 operating system vendors and a patch for AT&T Computer Systems
customers. AT&T has also provided a suggested fix for all Release 4
based systems.
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I. DESCRIPTION:
A security vulnerability exists in /bin/login in AT&T's System V
Release 4 operating system.
II. IMPACT:
System users can gain unauthorized privileges.
III. SOLUTION:
A. AT&T Computer Systems customers
Log into the root account. Change the execution permission on
the file /bin/login.
chmod 500 /bin/login
Contact AT&T Computer Systems at 800-922-0354 to obtain a fix.
The numbers associated with the fix are 156 (3.5" media) and
157 (5.25" media).
International customers should contact their local AT&T
Computer Systems representative.
B. All other System V Release 4 based systems
Log into the root account. Change the execution permission on
the file /bin/login.
chmod 500 /bin/login
Release 4 customers should contact their operating system
supplier for details on the availability of the software
update.
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The CERT/CC would like to thank AT&T for their timely response to our
report of this vulnerability.
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If you believe that your system has been compromised, contact CERT/CC via
telephone or e-mail.
Computer Emergency Response Team/Coordination Center (CERT/CC)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Internet E-mail: cert@cert.org
Telephone: 412-268-7090 24-hour hotline:
CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
on call for emergencies during other hours.
Past advisories and other computer security related information are available
for anonymous ftp from the cert.org (192.88.209.5) system.
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