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- CA-92:08 CERT Advisory
- April 10, 1992
- Silicon Graphics Computer Systems "IRIX" lp Vulnerability
-
- - ---------------------------------------------------------------------------
-
- 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.
-
- - ---------------------------------------------------------------------------
-
- 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.
-
- - ---------------------------------------------------------------------------
- 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.
- - ---------------------------------------------------------------------------
-
- 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: cert@cert.org
- 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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