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AUSCERT External Security Bulletin Redistribution
ESB-2004.0325 -- Sun Alert Notification - Sun Alert ID: 57554
Solaris 9 Patches WITHDRAWN - Security Vulnerability With ypserv and ypxfrd
05 May 2004
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AusCERT Security Bulletin Summary
---------------------------------
Product: ypserv
ypxfrd
Publisher: Sun Microsystems
Operating System: Solaris 9
Platform: IA-32
SPARC
Impact: Access Confidential Data
Access Required: Remote
Original Bulletin:
http://sunsolve.sun.com/pub-cgi/retrieve.pl?doc=fsalert%2F57554
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DOCUMENT ID: 57554
SYNOPSIS: Solaris 9 Patches WITHDRAWN - Security Vulnerability With
ypserv(1M) and ypxfrd(1M)
DETAIL DESCRIPTION:
Sun(sm) Alert Notification
* Sun Alert ID: 57554
* Synopsis: Solaris 9 Patches WITHDRAWN - Security Vulnerability
With ypserv(1M) and ypxfrd(1M)
* Category: Security
* Product: Solaris
* BugIDs: 5022150
* Avoidance: Workaround, T-Patch
* State: Committed
* Date Released: 30-Apr-2004
* Date Closed:
* Date Modified:
1. Impact
Solaris 9 systems running as NIS servers containing secure maps and
with patches 113579-02 through 113579-05 (for SPARC) or 114342-02
through 114342-05 (for x86) installed may allow local or remote
unprivileged users (in an NIS environment) access to secure map
information. Secure maps such as "passwd.adjunct.byname" are typically
used to store encrypted passwords and other sensitive information and
are not viewable to unprivileged users.
Patches 113579-02 through 113579-05 and 114342-02 through 114342-05
have been WITHDRAWN and are no longer available on SunSolve.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 9 with patches 113579-02 through 113579-05
x86 Platform
* Solaris 9 with patches 114342-02 through 114342-05
Note: Solaris 7 and 8 are not affected by this issue.
This issue only affects NIS servers containing secure maps. NIS secure
maps are stored on the server as dbm(3UCB) files with YP_SECURE as one
of the keys in the database. Standard default secure maps (if they
exist on the server) would be:
audit_user
group.adjunct.byname
passwd.adjunct.byname
The following script when run as "root" can help in finding secure
maps that may be present:
#!/bin/bash
for i in `ls -1 /var/yp/*/*.pag | sed -e s/\.pag//`
do
makedbm -u $i | grep YP_SECURE 2>&1 > /dev/null;
if [ $? -eq 0 ]; then
echo $i is a secure map
fi
done
3. Symptoms
Unprivileged local or remote users may be able to view secure maps
using commands such as ypmatch(1) or ypcat(1). For example, if
"audit_user" is configured to be a secure map on the NIS server, then
the following command can be run by any user on an NIS client system:
$ ypcat audit_user
to determine the contents of the map, which is typically visible only
to the "root" user.
SOLUTION SUMMARY:
4. Relief/Workaround
To work around the described issue, back out patches 113579-02 through
113579-05 (for SPARC) or 114342-02 through 114342-05 (for x86). After
backing out the patches, NIS services must be stopped and restarted
using the following commands:
# /usr/lib/netsvc/yp/ypstop
# /usr/lib/netsvc/yp/ypstart
Note: Systems installed with Solaris 9 Update 12/03 and 4/04 cannot
back out the affected patches.
Preliminary T-patches are available from
[1]http://sunsolve.sun.com/tpatches for the following releases:
SPARC Platform
* Solaris 9 T-Patch T113579-06
x86 Platform
* Solaris 9 T-Patch T114342-06
This document refers to one or more preliminary temporary patches
(T-Patches) which are designed to address the concerns identified
herein. Sun has limited experience with these patches due to their
preliminary nature. As such, you should only install the patches on
systems meeting the configurations described above. Sun may release
full patches at a later date, however, Sun is under no obligation
whatsoever to create, release, or distribute any such patch.
5. Resolution
A final resolution is pending completion.
This Sun Alert notification is being provided to you on an "AS IS"
basis. This Sun Alert notification may contain information provided by
third parties. The issues described in this Sun Alert notification may
or may not impact your system(s). Sun makes no representations,
warranties, or guarantees as to the information contained herein. ANY
AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
NON-INFRINGEMENT, ARE HEREBY DISCLAIMED. BY ACCESSING THIS DOCUMENT
YOU ACKNOWLEDGE THAT SUN SHALL IN NO EVENT BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, PUNITIVE, OR CONSEQUENTIAL DAMAGES THAT ARISE
OUT OF YOUR USE OR FAILURE TO USE THE INFORMATION CONTAINED HEREIN.
This Sun Alert notification contains Sun proprietary and confidential
information. It is being provided to you pursuant to the provisions of
your agreement to purchase services from Sun, or, if you do not have
such an agreement, the Sun.com Terms of Use. This Sun Alert
notification may only be used for the purposes contemplated by these
agreements.
Copyright 2000-2004 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved.
References
1. http://sunsolve.sun.com/tpatches
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