****************************************************************************** ------ ----- ----- --- ----- | ----- ---- | | | | | |--- | | | | | | | | | |-- | | | | |-- | | | | | | | | \ | | ----- ---- ----- ----- | \ ----- A D V I S O R Y 97.65 ****************************************************************************** Topic: Solaris DCE Integrated login bug if AFS klog not installed Source: CERT/CC Creation Date: September 25, 1997 Last Updated: To aid in the wide distribution of essential security information, FedCIRC is forwarding the following information from CERT/CC vendor bulletin VB-97.08. FedCIRC urges you to act on this information as soon as possible. If you have any questions, please contact FedCIRC: Telephone: +1 888 282 0870 Email: fedcirc@fedcirc.gov =======================FORWARDED TEXT STARTS HERE============================ -----BEGIN PGP SIGNED MESSAGE----- ============================================================================= 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============================= If you believe that your system has been compromised, contact the CERT Coordination Center or your representative in the Forum of Incident Response and Security Teams (FIRST). See http://www.first.org/team-info/. We strongly urge you to encrypt any sensitive information you send by email. The CERT Coordination Center can support a shared DES key and PGP. Contact the CERT staff for more information. Location of CERT PGP key ftp://ftp.cert.org/pub/CERT_PGP.key CERT Contact Information - ------------------------ Email cert@cert.org Phone +1 412-268-7090 (24-hour hotline) CERT personnel answer 8:30-5:00 p.m. EST (GMT-5)/EDT(GMT-4), and are on call for emergencies during other hours. Fax +1 412-268-6989 Postal address CERT Coordination Center Software Engineering Institute Carnegie Mellon University Pittsburgh PA 15213-3890 USA CERT publications, information about FIRST representatives, and other security-related information are available from http://www.cert.org/ ftp://ftp.cert.org/pub/ CERT advisories and bulletins are also posted on the USENET newsgroup comp.security.announce To be added to our mailing list for CERT advisories and bulletins, send your email address to cert-advisory-request@cert.org In the subject line, type SUBSCRIBE your-email-address * Registered U.S. Patent and Trademark Office. The CERT Coordination Center is part of the Software Engineering Institute (SEI). The SEI is sponsored by the U. S. Department of Defense. This file: ftp://ftp.cert.org/pub/cert_bulletins/VB-97.08.transarc -----BEGIN PGP SIGNATURE----- Version: 2.6.2 iQCVAwUBNCpw3HVP+x0t4w7BAQENwwP9EII44mpiLT/HZ3M65KUCIQ5RtxEQK3t3 0a4N6+vc1ohn+YPO0NjJ9ej0wf8kbA22WmOlP6nRaVIRN0CZXjvD8LK6lnz1EiwX W0L9sy9q3H6XSxTVpUiHjLQ3k9asqRoCgb2NEsy47W3Zrcg9GP1hPPlWcv9dROcP v78oHeCO6kg= =jwA3 -----END PGP SIGNATURE----- ========================FORWARDED TEXT ENDS HERE============================= The National Institute of Standards and Technology (NIST) has established a Federal Computer Incident response Capability (FedCIRC) to assist federal civilians agencies in their incident handling efforts by providing proactive and reactive computer security related services. FedCIRC is a partnership among NIST, the Computer Incident Advisory Capability (CIAC), and the CERT* Coordination Center (CERT/CC). If you believe that your system has been compromised, please contact FedCIRC: Telephone: +1 888 282 0870 Email: fedcirc@fedcirc.gov Web Server: http://www.fedcirc.gov/ * Registered in U.S. Patent and Trademark Office The CERT Coordination Center is part of the Software Engineering Institute. The Software Engineering Institute is sponsored by the U.S. Department of Defense. 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. 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.