************************************************************************** Security Bulletin 9213 DISA Defense Communications System April 27, 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-9213). ************************************************************************** + - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - + ! ! ! 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-92:09 CERT Advisory April 27, 1992 AIX Anonymous FTP Vulnerability --------------------------------------------------------------------------- The Computer Emergency Response Team/Coordination Center (CERT/CC) has received information concerning a vulnerability in the anonymous FTP configuration in all versions of AIX. IBM is aware of this problem and a fix is available as apar number "ix23944". This patch is available for all AIX releases from "GOLD". IBM customers may call IBM Support (800-237-5511) and ask that the fix be shipped to them. Patches may be obtained outside the U.S. by contacting your local IBM representative. The fix will appear in the upcoming 2009 update and the next release of AIX. --------------------------------------------------------------------------- I. Description Previous versions of the anonymous FTP installation script, /usr/lpp/tcpip/samples/anon.ftp, incorrectly configured various files and directories. II. Impact Remote users can execute unauthorized commands and gain access to the system if anonymous FTP has been installed. III. Solution A. Obtain the fix from IBM Support. The fix contains three files: a "readme" file (README.a23944), the fix installation script (install.a23944), and an archive containing the updated files (PATCH.a23944.Z). B. Install the fix following the instructions in the README file. --------------------------------------------------------------------------- The CERT/CC would like to thank Charles McGuire of the Computer Science Department, the University of Montana, for bringing this security vulnerability to our attention and IBM for their response to the 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). Please note: cert.sei.cmu.edu is soon to become cert.org. **************************************************************************** * * * 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. * * * ****************************************************************************