home *** CD-ROM | disk | FTP | other *** search
-
- **************************************************************************
- Security Bulletin 9305 DISA Defense Communications System
- February 16, 1993 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-9305).
- **************************************************************************
- + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
- ! !
- ! 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-93:04 CERT Advisory
- February 12, 1993
- Commodore Amiga UNIX finger Vulnerability
-
- ---------------------------------------------------------------------------
-
- The CERT Coordination Center has received information concerning a
- vulnerability in the "finger" program of Commodore Business Machine's
- Amiga UNIX product. The vulnerability affects Commodore Amiga UNIX
- versions 1.1, 2.03, 2.1, 2.1p1, 2.1p2, and 2.1p2a. Commodore is aware
- of the vulnerability, and both a workaround and a patch are available.
- Affected sites should apply either the workaround or the patch.
- Directions are provided below.
-
- If you have any further questions, contact Commodore's David Miller
- via e-mail. David's e-mail address is davidm@cdmvax.commodore.com.
-
- ---------------------------------------------------------------------------
-
- I. Description
-
- The "finger" command in Amiga UNIX contains a security
- vulnerability.
-
-
- II. Impact
-
- Non-privileged users can gain unauthorized access to files.
-
-
- III. Solution
-
- Commodore has suggested a workaround and a patch, as follows:
-
- A. Workaround
-
- As root, modify the permission of the existing /usr/bin/finger
- to prevent misuse.
-
- # /bin/chmod 0755 /usr/bin/finger
-
- B. Patch
-
- As root, install the "pubsrc" package from the distribution tape.
-
- In the file, "/usr/src/pub/cmd/finger/src/finger.c", add the line:
-
- setuid(getuid());
-
- immediately before the line reading:
-
- display_finger(finger_list);
-
- (Optionally) save a copy of the existing /usr/bin/finger and modify
- its permission to prevent misuse.
-
- # /bin/mv /usr/bin/finger /usr/bin/finger.orig
- # /bin/chmod 0755 /usr/bin/finger.orig
-
- In the directory, "/usr/src/pub/cmd/finger", issue the command:
-
- # cd /usr/src/pub/cmd/finger
- # make install
-
- ------------------------------------------------------------------------------
- The CERT Coordination Center wishes to thank Commodore Business
- Machines for their response to this problem.
- ------------------------------------------------------------------------------
-
- If you believe that your system has been compromised, contact the CERT
- Coordination Center 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 personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
- on call for emergencies during other hours.
-
- CERT Coordination Center
- 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).
-
-
- ****************************************************************************
- * *
- * 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. *
- * *
- ****************************************************************************
-