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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes Sun Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.
6726575 / 6730614 – Schwachstelle im Sun Solaris IP Filter
Aufgrund einer Schwachstelle im Solaris IP Filter kann ein entfernter
Angreifer den Inhalt den Inhalt des DNS-Cache auf dem betroffenen
System veraendern. Es sind nur Systeme betroffen, deren IP Filter
Software Network Address Translation anbietet. Bei erfolgreicher
Ausnutzung der Schwachstelle kann der Netzwerkverkehr von Systemen
umgeleitet werden, die DNS Antworten aus dem angegriffenen Cache
beziehen. Ein Angreifer kann dadurch unter anderem an vertrauliche
Daten gelangen.
Betroffen sind die folgenden Software Pakete und Plattformen:
Solaris 10
OpenSolaris
SPARC Plattform
* Solaris 10 ohne Patch 127888-11
* OpenSolaris basierend auf den Builds snv_01 bis snv_95
x86 Plattform
* Solaris 10 ohne Patch 127889-11
* OpenSolaris basierend auf den Builds snv_01 bis snv95
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-245206-1
(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.
Mit freundlichen Gruessen,
Michael Groening, DFN-CERT
– —
Michael Groening (Incident Response Team), +49 40 808077-555
DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-555
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
Sachsenstrasse 5, 20097 Hamburg/Germany, CEO: Dr. Klaus-Peter Kossakowski
Automatische Warnmeldungen https://www.cert.dfn.de/autowarn
Solution Type Sun Alert
Solution 245206 : Security Vulnerability in Solaris IP Filter
Network Address Translation (NAT) May Lead to DNS Cache Poisoning
Related Categories
* Home>Content>Sun Alert Criteria Categories>Security
* Home>Content>Sun Alert Release Phase>Resolved
Bug ID
6726575, 6730614
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release
11-Nov-2008
SA Document Body
A security vulnerability in Solaris IP Filter (ipfilter(5)):
1. Impact
A security vulnerability in Solaris IP Filter (ipfilter(5)) when
configured to provide Network Address Translation (NAT) service on DNS
servers may allow remote unprivileged users to cause named(1M) to
return incorrect addresses for Internet hosts, thereby redirecting end
users to unintended hosts or services.
This vulnerability annuls the fix for the DNS Cache Poisoning
Vulnerability described in Sun Alert 239392, available at:
* http://sunsolve.sun.com/search/document.do?assetkey=1-66-239392-1
Sun acknowledges with thanks, CERT/CC for bringing this issue to our
attention.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 127888-11
* OpenSolaris based upon builds snv_01 through snv_95
x86 Platform
* Solaris 10 without patch 127889-11
* OpenSolaris based upon builds snv_01 through snv95
Note 1: Solaris 8 and Solaris 9 are not impacted by this issue as they
do not deliver an IPFilter Network Address Translation (NAT) service.
Note 2: OpenSolaris distributions may include additional bug fixes
above and beyond the build from which it was derived.
To determine the base build of OpenSolaris, the following command can
be used:
$ uname -v
snv_86
Note 3: Only OpenSolaris installations including the affected binary
“/usr/sbin/sparcv9/ipnat” are impacted by this issue.
Note 4: Only systems with the BIND named(1M) service enabled and using
IPFilter’s Network Address Translation service are impacted by this
issue.
To verify if BIND is running on a system, the following command can be
used:
$ ps -e | grep in.named && echo “BIND is running”
To verify if IPFilter’s Network Address Translation service is in use,
the following command can be used:
# ipnat -l | egrep ‘^map.*portmap’
If there is no output from the above command, the system is not
vulnerable to this issue.
3. Symptoms
There are no predictable symptoms that would indicate the described
vulnerability has been exploited.
4. Workaround
To work around this issue, it is possible to configure NAT to not
change the port number for DNS traffic. This is done using a NAT
rule in “/etc/ipf/ipnat.conf”. If, for example, this file contains a
NAT rule such as the following:
map bge0 192.168.1.0/24 -> 0/32 portmap tcp/udp 5000:50000
and the DNS server is in the 192.168.1.0/24 subnet, then change this
rule in the configuration file to be two rules, in the following order:
map bge0 from 192.168.1.0/24 to any port = 53 -> 0/32 tcp/udp
map bge0 192.168.1.0/24 -> 0/32 portmap tcp/udp 5000:50000
5. Resolution
This issue is addressed in the following release:
SPARC Platform
* Solaris 10 with patch 127888-11 or later
* OpenSolaris based upon builds snv_96 or later
x86 Platform
* Solaris 10 with patch 127889-11 or later
* OpenSolaris based upon builds snv_96 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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