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- From: tencati@nssdca.gsfc.nasa.gov
- Newsgroups: alt.security
- Subject: CIAC bulletin C-1: New TFTPD server available for IBM RS6000 systems
- Keywords: TFTP
- Message-Id: <7OCT199117542234@nssdca.gsfc.nasa.gov>
- Date: 7 Oct 91 22:54:00 GMT
- Organization: NASA - Goddard Space Flight Center
-
- The following was received from the DoE CIAC regarding a patched TFTPD
- server for IBM RS6000 systems:
-
- ---------------------
-
- Date: Mon, 7 Oct 91 14:25:12 PDT
- Subject: CIAC bulletin C-1: New TFTPD server available for IBM RS6000 systems
-
- _____________________________________________________
- The Computer Incident Advisory Capability
- ___ __ __ _ ___
- / | / \ /
- \___ __|__ /___\ \___
- _____________________________________________________
- INFORMATION BULLETIN
-
- New TFTPD server available for IBM RS6000 systems
-
- October 7, 1991, 1400 PDT Number C-1
-
- -----------------------------------------------------------------------------
- PROBLEM: All world readable files can be remotely retrieved using TFTP
- on IBM RS6000 systems running AIX.
- PLATFORM: IBM RS6000 systems running versions of AIX prior to the 2009 update.
- DAMAGE: Potential unauthorized access and disclosure of critical
- system files.
- SOLUTIONS: Request and install TFTPD patch APAR number ix22628 from
- IBM; this patch limits the access of TFTP to specified directories.
- -----------------------------------------------------------------------------
- Critical Facts about the new TFTPD server
-
- CIAC has learned of a version of TFTPD available for IBM RS6000
- systems running AIX. This version will eliminate a problem in current
- versions of TFTPD that allows potential unauthorized access and
- disclosure of world-readable (including critical system) files by
- adding a feature that denies access to sensitive areas of the system.
- This program continues to support tftp access (which is required to
- support X-Terminals). This new TFTPD server uses a configuration file
- (/etc/tftpaccess.ctl) to allow or deny access to specific directories
- and sub-directories before permitting any transfer of data.
-
- During TFTP access the file /etc/tftpaccess.ctl is searched for lines
- that start with "allow:" or "deny:" All other lines are ignored. If
- the file does not exist, the access is allowed in the currently
- supported fashion. For example, the /usr directory might be allowed
- and the /usr/ucb directory might be denied. This means that any
- directory or file in the /usr directory except the /usr/ucb directory
- can be accessed. The entries in the /etc/tftpaccess.ctl file must be
- absolute path names. The permissions on the /etc/tftpaccess.ctl file
- should be writable only by the root user (mode 0644).
-
- IBM RS6000 customers may request this implementation of TFTPD by
- calling IBM Service and requesting APAR number ix22628. This version
- of TFTPD will appear in the 2009 update and the next release of AIX.
- To install this new version of TFTPD, replace your current version of
- /etc/tftpd with the patched program and follow the provided
- instructions for setting up a /etc/tftpaccess.ctl file with the
- appropriate "allow:" or "deny:" lines. Please contact IBM or CIAC
- for assistance.
-
- Tom Longstaff
- (510) 423-4416**/(FTS) 543-4416
- longstaf@llnl.gov
-
- Send e-mail to ciac@llnl.gov or call CIAC at (510) 422-8193**/(FTS)
- 532-8193. FAX messages to: (510) 423-8002**/(FTS) 543-8002.
-
- Previous CIAC bulletins and other information is available via
- anonymous ftp from irbis.llnl.gov (ip address 128.115.19.60).
-
- **Note area code has changed from 415, although the 415 area code will
- work until Jan. 1992.
-
- Neither the United States Government nor the University of California
- nor any of their employees, makes any warranty, expressed or implied,
- or assumes any legal liability or responsibility for the accuracy,
- completeness, or usefulness of any information, product, or process
- disclosed, or represents that its use would not infringe privately
- owned rights. Reference herein to any specific commercial products,
- process, or service by trade name, trademark manufacturer, or
- otherwise, does not necessarily constitute or imply its endorsement,
- recommendation, or favoring by the United States Government or the
- University of California. The views and opinions of authors expressed
- herein do not necessarily state or reflect those of the United States
- Government nor the University of California, and shall not be used for
- advertising or product endorsement purposes.
-
-