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The U.S. Department of Energy
Computer Incident Advisory Capability
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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)
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CIAC has several self-subscribing mailing lists for electronic
publications:
1. CIAC-BULLETIN for Advisories, highest priority - time critical
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2. CIAC-NOTES for Notes, a collection of computer security articles;
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get past issues of CIAC bulletins via email, etc.
PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
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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
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