-----BEGIN PGP SIGNED MESSAGE----- __________________________________________________________ The U.S. Department of Energy Computer Incident Advisory Capability ___ __ __ _ ___ / | /_\ / \___ __|__ / \ \___ __________________________________________________________ INFORMATION BULLETIN Solaris DCE and AFS Integrated login Vulnerability September 30, 1997 17:00 GMT Number H-109 ______________________________________________________________________________ PROBLEM: A vulnerability exists on systems running Transarc's Solaris DCE integrated login program (login.dce in place of /bin/login) which have AFS installed but no AFS klog binary in any of the standard locations. PLATFORM: Solaris 2.4 and Solaris 2.5 running Transarc DCE 1.1 in conjunction with any version of AFS. DAMAGE: Users without accounts on the system may gain unauthorized access to local resources. SOLUTION: Apply patches or workaround listed below. ______________________________________________________________________________ VULNERABILITY Transarc urges you to act on this information as soon as ASSESSMENT: possible. ______________________________________________________________________________ [ Start CERT Advisory ] ============================================================================= CERT* Vendor-Initiated Bulletin VB-97.08 September 25, 1997 Topic: Solaris DCE Integrated login bug if AFS klog not installed Source: Transarc Corp. To aid in the wide distribution of essential security information, the CERT Coordination Center is forwarding the following information from Transarc Corporation. Transarc urges you to act on this information as soon as possible. Transarc contact information is included in the forwarded text below; please contact them if you have any questions or need further information. =======================FORWARDED TEXT STARTS HERE============================ Problem: Vulnerability in Transarc DCE Integrated login for sites running both AFS and DCE. I. Description On systems running Transarc's Solaris DCE integrated login program (login.dce in place of /bin/login) which have AFS installed but no AFS klog binary in any of the standard locations, unauthorized users may gain access to local system resources as any valid user by supplying a valid username for login, with any arbitrary string as a password. The vulnerability stems from an incorrect interpretation of the situation which occurs when an AFS klog binary is not found by login.dce. If there is a klog binary in ANY of the following standard locations, the vulnerability will NOT occur: /opt/dcelocal/bin/klog /usr/afsws/bin/klog /usr/vice/etc/klog Vulnerable products include Transarc DCE 1.1 for Solaris 2.4 and Solaris 2.5 in conjunction with any version of AFS. Systems not running AFS are not vulnerable to this issue. II. Impact Users without accounts on the system may gain unauthorized access to local resources. Access to resources controlled by AFS/DCE/DFS is unaffected, as no network credentials are granted unless a valid password is supplied. III. Solution The following patches are available from Transarc: DCE 1.1 for Solaris 2.4: patch 40 and higher DCE 1.1 for Solaris 2.5: patch 25 and higher A workaround is possible as well: simply install any program which produces output on stdout in one of the standard klog locations. (A "hello, world" program or shell script is sufficient; as long as it puts something on stdout, it's good enough. Optimally, install the actual AFS klog program in one of the above locations.) Contact Transarc customer support by telephone at 412-281-5852 or via email (dce-help@transarc.com) for additional information or questions. IV. Other Platform Impact This vulnerability affects only Transarc products on the Solaris platform. ========================FORWARDED TEXT ENDS HERE============================= [ End CERT Advisory ] ______________________________________________________________________________ CIAC wishes to acknowledge the contributions of CERT & Transarc Corp. for the information contained in this bulletin. ______________________________________________________________________________ CIAC, the Computer Incident Advisory Capability, is the computer security incident response team for the U.S. Department of Energy (DOE) and the emergency backup response team for the National Institutes of Health (NIH). CIAC is located at the Lawrence Livermore National Laboratory in Livermore, California. CIAC is also a founding member of FIRST, the Forum of Incident Response and Security Teams, a global organization established to foster cooperation and coordination among computer security teams worldwide. CIAC services are available to DOE, DOE contractors, and the NIH. CIAC can be contacted at: Voice: +1 510-422-8193 FAX: +1 510-423-8002 STU-III: +1 510-423-2604 E-mail: ciac@llnl.gov For emergencies and off-hour assistance, DOE, DOE contractor sites, and the NIH may contact CIAC 24-hours a day. During off hours (5PM - 8AM PST), call the CIAC voice number 510-422-8193 and leave a message, or call 800-759-7243 (800-SKY-PAGE) to send a Sky Page. CIAC has two Sky Page PIN numbers, the primary PIN number, 8550070, is for the CIAC duty person, and the secondary PIN number, 8550074 is for the CIAC Project Leader. Previous CIAC notices, anti-virus software, and other information are available from the CIAC Computer Security Archive. World Wide Web: http://ciac.llnl.gov/ Anonymous FTP: ciac.llnl.gov (198.128.39.53) Modem access: +1 (510) 423-4753 (28.8K baud) +1 (510) 423-3331 (28.8K baud) CIAC has several self-subscribing mailing lists for electronic publications: 1. CIAC-BULLETIN for Advisories, highest priority - time critical information and Bulletins, important computer security information; 2. CIAC-NOTES for Notes, a collection of computer security articles; 3. SPI-ANNOUNCE for official news about Security Profile Inspector (SPI) software updates, new features, distribution and availability; 4. SPI-NOTES, for discussion of problems and solutions regarding the use of SPI products. Our mailing lists are managed by a public domain software package called Majordomo, which ignores E-mail header subject lines. To subscribe (add yourself) to one of our mailing lists, send the following request as the E-mail message body, substituting ciac-bulletin, ciac-notes, spi-announce OR spi-notes for list-name: E-mail to ciac-listproc@llnl.gov or majordomo@tholia.llnl.gov: subscribe list-name e.g., subscribe ciac-notes You will receive an acknowledgment email immediately with a confirmation that you will need to mail back to the addresses above, as per the instructions in the email. This is a partial protection to make sure you are really the one who asked to be signed up for the list in question. If you include the word 'help' in the body of an email to the above address, it will also send back an information file on how to subscribe/unsubscribe, get past issues of CIAC bulletins via email, etc. PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing communities receive CIAC bulletins. If you are not part of these communities, please contact your agency's response team to report incidents. Your agency's team will coordinate with CIAC. The Forum of Incident Response and Security Teams (FIRST) is a world-wide organization. A list of FIRST member organizations and their constituencies can be obtained via WWW at http://www.first.org/. This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, 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 or the University of California, and shall not be used for advertising or product endorsement purposes. LAST 10 CIAC BULLETINS ISSUED (Previous bulletins available from CIAC) H-99: SunOS, Solaris ifconfig ioctls Vulnerability H-100: SunOS, Solaris libXt Vulnerability H-101: FreeBSD procfs Vulnerability H-102: SGI IRIX webdist.cgi, handler and wrap programs Vulnerabilities H-103: HP-UX X11/Motif Libraries Vulnerability H-104: HP-UX libXt Vulnerability H-105: HP-UX vuefile, vuepad, dtfile, & dtpad Vulnerabilities H-106: SGI IRIX LOCKOUT & login/scheme Vulnerabilities H-107: UNIX Buffer Overflow in rdist Vulnerability H-108: SunOS, Solaris libX11 Buffer Overflow Vulnerability -----BEGIN PGP SIGNATURE----- Version: 4.0 Business Edition iQCVAwUBNDFyMLnzJzdsy3QZAQFNtwP8DIZkvZE3z/dqnjFzBUJZWlhdQN8TKtLc GPY5Vgr479WGpktIMaEXkvtDh/I+XxJpmpqoqe00oRrKdk1HTuUjTozQItgWsOT6 MFmU1CMeRUHo2iDBfjyK/CZbOFTlYN55As0Xc3fCaRaM0PaxN7h5KgTCrB7VsiR/ l42hBYosoh0= =gh/h -----END PGP SIGNATURE-----