_____________________________________________________ The Computer Incident Advisory Capability ___ __ __ _ ___ / | / \ / \___ __|__ /___\ \___ _____________________________________________________ Information Bulletin Increasing Security on Your UNICOS System March 5, 1100 PST Number B-17 Critical UNICOS Information ________________________________________________________________________ PROBLEM: Some UNICOS systems have not installed all patches that may have security implications PLATFORM: Many versions of the Cray UNICOS operating system DAMAGE: Possibility that some UNICOS systems are not operating as securely as possible SOLUTIONS: Install UNICOS patches that apply to your version of UNICOS _______________________________________________________________________ CIAC has been working with Cray Research Corporation as well as Cray users in the DOE community to determine which basic set of UNICOS patches provides a baseline level of security in UNICOS systems. The patches described below have been identified as important in assuring that this baseline level has been met. Some of these patches have been the subject of Cray alert bulletins (Cray Field Alerts), each of which (if applicable) will be referenced as each patch is identified. You may contact Cray for additional information in obtaining, installing, and assuring that these patches have been installed on your UNICOS system. The mods listed below are Cray binary files available to correct each described problem. These mods are available on the crayamid system. Each UNICOS mod has a unique identification. For example, Cray mod d15567cmda) and is appropriate to specific versions of the UNICOS operating system. Unless otherwise stated, the mod will apply to the entire family of Cray hardware, including Cray-1, X-MP, Y-MP, and Cray-2. 1. Cray mod d15567cmda, UNICOS version 5.0/5.1 Modifies the command /bin/du . Alternatively, removing the SETUID bit from the /bin/du command by executing the following command as root will effectively replace the need for the above mod: chmod 0755 /bin/du 2. Cray mod d18028, UNICOS version 5.0/5.1 Modifies the command /etc/nu. This mod has been integrated in the baseline operating system for Cray-1/XMP/YMP at version 5.1.8d and Version 5.1.8 for Cray-2. For more details, see Cray Field Alert #93. 3. Cray mod e13159utsa, UNICOS version 4.0, 4.EA, 5.0 This patch was the subject of Cray Field Alert #72. The patch modifies the read/write and reada/writea system calls. A copy of the mod may be found on the crayamid system under /u/mods/unicos_x/5.0/uts/e13159utsa. 4. Limited buffer space in the kernel for some entries. This problem has been corrected with the following mods. CIAC recommends that you install any mods that apply to your system. UNICOS 5.1: XMP d19646utsa Cray-2 d19647inca XMP, Cray-2 d19648tcpa UNICOS 6.0 XMP 60uts07182a XMP 60uts07187a XMP, Cray-2 60uts07186a Cray-2 60uts07184a UNICOS 6.1 XMP 61uts07182a XMP 61uts07187a XMP,Cray-2 61uts07186a Cray-2 61uts07184a CIAC recommends that you install any mods (listed above) appropriate to your UNICOS system. In addition, you should upgrade your version of UNICOS to the most recent available, since many improvements to the security of your system have been integrated into the most recent base operating system. For additional information or assistance, please contact CIAC: Tom Longstaff (415) 423-4416 or (FTS) 543-4416, or Eugene Schultz (415) 422-7781 or (FTS) 532-7781 Call CIAC at (415) 422-8193 or (FTS) 532-8193 or send e-mail to ciac@cheetah.llnl.gov Send FAX messages to: (415) 423-0913 or (FTS) 543-0913 Karis Forster and Chuck Athey provided information contained in this bulletin. 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.