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-----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 (This email address is being protected from spambots. You need JavaScript enabled to view it.) 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 This email address is being protected from spambots. You need JavaScript enabled to view it. 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 This email address is being protected from spambots. You need JavaScript enabled to view it. 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-----
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