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DDN Security Bulletin 9109 DCA DDN Defense Communications System
23 July 91 Published by: DDN Security Coordination Center
(
[email protected]) (800) 235-3155
DEFENSE DATA NETWORK
SECURITY BULLETIN
The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
Coordination Center) under DCA contract as a means of communicating
information on network and host security exposures, fixes, & concerns
to security & management personnel at DDN facilities. Back issues may
be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.67.67.20]
using login="anonymous" and password="guest". The bulletin pathname is
SCC:DDN-SECURITY-yynn (where "yy" is the year the bulletin is issued
and "nn" is a bulletin number, e.g. SCC:DDN-SECURITY-9001).
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Patch for SunOS /usr/etc/rpc.mountd
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! !
! The following important advisory was issued by the Computer !
! Emergency Response Team (CERT) and is being relayed unedited !
! via the Defense Communications Agency's Security Coordination !
! Center distribution system as a means of providing DDN !
! subscribers with useful security information. !
! !
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CA-91:09 CERT Advisory
July 15, 1991
Patch for SunOS /usr/etc/rpc.mountd
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The Computer Emergency Response Team/Coordination Center (CERT/CC) has
received information concerning the availability of a security patch
for /usr/etc/rpc.mountd in Sun Microsystems, Inc. operating systems.
This problem will be fixed in SunOS 5.0. Patches are available for
SunOS 4.1, and SunOS 4.1.1 through your local Sun answer centers
worldwide as well as through anonymous ftp to ftp.uu.net (in ~ftp/sun-dist).
Patch ID and file information are as follows:
Fix Patch ID Filename Checksum
/usr/etc/rpc.mountd 100296-01 100296-01.tar.Z 01501 233
Please note that Sun Microsystems sometimes updates patch files. If
you find that the checksum is different please contact Sun Microsystems
or us for verification.
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I. DESCRIPTION:
If an access list of hosts within /etc/exports is a string
over 256 characters then the filesystem can be mounted by
everyone.
II. IMPACT:
Unauthorized remote hosts will be able to mount the filesystem.
III. SOLUTION:
As root:
1. Move the existing rpc.mountd aside
# mv /usr/etc/rpc.mountd /usr/etc/rpc.mountd.OLD
2. Install the new version
# cp sun{3,3x,4,4c}/{4.1,4.1.1,4.1_PSR_A}/rpc.mountd /usr/etc
# chown root.staff /usr/etc/rpc.mountd
# chmod 755 /usr/etc/rpc.mountd
3. Kill the currently running rpc.mountd and restart it, or,
reboot the system. Systems currently mounting filesystems
from this host will have interruptions in service either
way.
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If you believe that your system has been compromised, contact CERT/CC via
telephone or e-mail.
Computer Emergency Response Team/Coordination Center (CERT/CC)
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Internet E-mail:
[email protected]
Telephone: 412-268-7090 24-hour hotline:
CERT/CC personnel answer 7:30a.m.-6:00p.m. EST,
on call for emergencies during other hours.
Past advisories and other computer security related information are available
for anonymous ftp from the cert.sei.cmu.edu (192.88.209.5) system.
Downloaded From P-80 International Information Systems 304-744-2253
