Date: 13 November 2008
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===========================================================================
AUSCERT External Security Bulletin Redistribution
ESB-2008.1044 -- [Solaris]
Security Vulnerability in Solaris IP Filter Network Address
Translation (NAT) May Lead to DNS Cache Poisoning
13 November 2008
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: ipfilter
Publisher: Sun Microsystems
Operating System: Solaris 10
OpenSolaris
Impact: Provide Misleading Information
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-245206-1
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Solution Type: Sun Alert
Solution 245206 : Security Vulnerability in Solaris IP Filter
Network Address Translation (NAT) May Lead to DNS Cache Poisoning
Bug ID: 6726575, 6730614
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release: 11-Nov-2008
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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