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CA-92:08 CERT Advisory
April 10, 1992
Silicon Graphics Computer Systems "IRIX" lp Vulnerability
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The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning a method of unauthorized root access
in the lp software in Silicon Graphics Computer Systems (SGI) IRIX
operating systems. This vulnerability is present in all current
versions of IRIX.
Silicon Graphics Computer Systems and the CERT/CC strongly recommend
that sites take immediate action to eliminate this vulnerability from
their systems.
This vulnerability will be fixed in IRIX 4.0.5 and is NOT present in any
version of the Trusted IRIX/B product.
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I. Description
When IRIX pre-4.0.5 systems are installed or updated using either
the basic system software ("eoe1.sw.unix") or the system manager
software ("eoe2.sw.vadmin") media, a vulnerability is introduced
in the lp software.
II. Impact
Any user logged into the system can gain root access.
III. Solution
As root, execute the following commands:
# cd /usr/lib
# chmod a-s,go-w lpshut lpmove accept reject lpadmin
# chmod go-ws lpsched vadmin/serial_ports vadmin/users vadmin/disks
# cd /usr/bin
# chmod a-s,go-w disable enable
# chmod go-ws cancel lp lpstat
If the eoe2.sw.vadmin software is not installed, you may
ignore any warning messages from chmod such as:
"chmod: WARNING: can't access vadmin/serial_ports"
If system software should ever be reinstalled from pre-4.0.5
media or restored from a backup tape created before the patch was
applied, repeat the above procedure before enabling logins by
normal users.
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The CERT/CC would like to thank Silicon Graphics Computer Systems for
bringing this security vulnerability to our attention and for their quick
response to this problem.
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If you believe that your system has been compromised, contact CERT/CC or
your representative in FIRST (Forum of Incident Response and Security Teams).
Internet E-mail:
[email protected]
Telephone: 412-268-7090 (24-hour hotline)
CERT/CC personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
on call for emergencies during other hours.
Computer Emergency Response Team/Coordination Center (CERT/CC)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories, information about FIRST representatives, and other
information related to computer security are available for anonymous ftp
from cert.org (192.88.209.5).
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