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- **************************************************************************
- Security Bulletin 9212 DISA Defense Communications System
- April 10, 1992 Published by: DDN Security Coordination Center
- (SCC@NIC.DDN.MIL) 1-(800) 365-3642
-
- DEFENSE DATA NETWORK
- SECURITY BULLETIN
-
- The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
- Coordination Center) under DISA contract as a means of communicating
- information on network and host security exposures, fixes, and concerns
- to security and management personnel at DDN facilities. Back issues may
- be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
- using login="anonymous" and password="guest". The bulletin pathname is
- scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
- and "nn" is a bulletin number, e.g. scc/ddn-security-9212).
- **************************************************************************
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
- ! !
- ! The following important advisory was issued by the Computer !
- ! Emergency Response Team (CERT) and is being relayed unedited !
- ! via the Defense Information Systems Agency's Security !
- ! Coordination Center distribution system as a means of !
- ! providing DDN subscribers with useful security information. !
- ! !
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
- ===========================================================================
- 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.sei.cmu.edu
- 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.sei.cmu.edu (192.88.209.5).
-
- ****************************************************************************
- * *
- * The point of contact for MILNET security-related incidents is the *
- * Security Coordination Center (SCC). *
- * *
- * E-mail address: SCC@NIC.DDN.MIL *
- * *
- * Telephone: 1-(800)-365-3642 *
- * *
- * NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST, *
- * Monday through Friday except on federal holidays. *
- * *
- ****************************************************************************
-