Date: 24 December 2008
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AUSCERT External Security Bulletin Redistribution
ESB-2008.1152 -- [Solaris]
A Security Vulnerability in the Solaris Name Service Cache Daemon
(nscd(1M)) May Allow Unauthorized Access to Data and
Escalation of Privileges
24 December 2008
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AusCERT Security Bulletin Summary
---------------------------------
Product: nscd
Publisher: Sun Microsystems
Operating System: Solaris
OpenSolaris
Impact: Increased Privileges
Access Privileged Data
Access: Existing Account
CVE Names: CVE-2008-5699
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-242006-1
Revision History: December 24 2008: Added CVE
December 22 2008: Initial Release
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Solution Type: Sun Alert
Solution 242006 : A Security Vulnerability in the Solaris Name
Service Cache Daemon (nscd(1M)) May Allow Unauthorized Access to Data
and Escalation of Privileges
Bug ID: 6740382
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release: 18-Dec-2008
A Security Vulnerability in the Solaris Name Service Cache Daemon
(nscd(1M)) May Allow Unauthorized Access to Data and Escalation of
Privileges
1. Impact
A security vulnerability in the Solaris name service cache daemon
(nscd(1M)) may, under certain conditions, allow local unprivileged
users to gain access to unauthorized information and gain elevated
privileges.
Sun acknowledges with thanks, Mike Gerdts for bringing this issue to
our attention.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform:
* Solaris 10 Update 4 (8/07) without patch 138263-03
* OpenSolaris based upon builds snv_50 through snv_104
x86 Platform:
* Solaris 10 Update 4 (8/07) without patch 138264-03
* OpenSolaris based upon builds snv_50 through snv_104
Notes:
1. Solaris 8, Solaris 9 and Solaris 10 releases prior to Solaris 10
Update 4 (8/07) are not impacted by this issue.
2. OpenSolaris distributions may include additional bug fixes above
and beyond the build from which it was derived. The base build can be
derived as follows:
$ uname -a
SunOS phys-node-1 5.11 snv_86 i86pc i386 i86pc
3. This issue occurs only when nscd(1M) is running and the 'compat'
mode is configured for the 'passwd' entry in nsswitch.conf(4).
The following command may be run to check if the nscd(1M) process is
running:
$ svcs svc:/system/name-service-cache
STATE STIME FMRI
online Aug_05 svc:/system/name-service-cache:default
"online" indicates nscd is running.
STATE STIME FMRI
disabled 12:34:55 svc:/system/name-service-cache:default
"disabled" indicates nscd is not running.
The following command may be run to check if the 'compat' mode has
been configured for the passwd(1) entry in nsswitch.conf(4):
$ grep passwd: /etc/nsswitch.conf
passwd: compat
if the 'compat' mode has been configured for the passwd(1) entry.
3. Symptoms
There are no predictable symptoms to indicate this issue has been
exploited to gain access to unauthorized data or gain elevated
privileges.
4. Workaround
It is possible to work around the described issue with one of the
following options:
A) Disable the nscd(1M) daemon. This may be done by executing the
following command as the 'root' user:
# svcadm disable svc:/system/name-service-cache
Disabling nscd(1M) may slow responses to name services requests on the
affected host.
B) Remove the 'compat' entry for 'passwd' in the file
/etc/nsswitch.conf
C) If the entry for 'passwd_compat' in /etc/nsswitch.conf is either
'nis' or 'ldap', modify the entry for 'passwd' in the same file as
follows:
passwd: nisplus compat
If the entry for 'passwd_compat' in /etc/nsswitch.conf is 'nisplus',
modify the entry for 'passwd' in the same file as follows:
passwd: yyyyyy compat
where 'yyyyyy' is indeed the string 'yyyyyy' or any string that would
not match a existing source.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform:
* Solaris 10 Update 4 (8/07) with patch 138263-03 or later
* OpenSolaris based upon build snv_105 or later
x86 Platform:
* Solaris 10 Update 4 (8/07) with patch 138264-03 or later
* OpenSolaris based upon build snv_105 or later
For more information on Security Sun Alerts, see Technical
Instruction ID 213557.
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 2000-2008 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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