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AUSCERT External Security Bulletin Redistribution
ESB-2006.0705 -- [Solaris]
A Security Issue With Solaris 10 x64 Systems Using IPv6
Forwarding May Result in a Denial of Service (DoS)
27 September 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: IPv6 Forwarding
Publisher: Sun Microsystems
Operating System: Solaris 10
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102568-1
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Sun(sm) Alert Notification
* Sun Alert ID: 102568
* Synopsis: A Security Issue With Solaris 10 x64 Systems Using IPv6
Forwarding May Result in a Denial of Service (DoS)
* Category: Security
* Product: Solaris 10 Operating System for x86 Platforms
* BugIDs: 6222966
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 25-Sep-2006
* Date Closed: 25-Sep-2006
* Date Modified:
1. Impact
Solaris 10 x64 systems configured to use Internet Protocol Version 6
(ip6(7P)) may panic when processing certain IPv6 packets. A local or
remote unprivileged user may be able to send IPv6 packets that could
panic the system causing a Denial of Service (DoS).
2. Contributing Factors
This issue can occur in the following releases:
x86 Platform
* Solaris 10 without patch 118855-16
Note: Solaris 8 and Solaris 9, systems are not impacted by this issue.
Solaris 10 sparc and Solaris 10 32 bit x86 systems are also not
impacted.
To determine if a system is running in 64-bit mode, the following
command can be run:
$ isainfo -b
64
If "64" is returned, the system is running in 64-bit mode.
This issue only affects Systems that use IPv6 forwarding. To determine
if a system is running with IPv6 enabled, the following command can be
used:
$ ifconfig -a6
If entries are returned marked "UP and RUNNING" then the system is
utilizing IPv6.
3. Symptoms
If the described issue occurs, the system will panic with a stack
trace similar to the following:
fffffe80000b36c0 unix:die+da (ffffffff00000000, 184a16e00)
fffffe80000b37a0 unix:trap+5ea ()
fffffe80000b37b0 unix:cmntrap+11b ()
fffffe80000b3980 ip:ip_rput_data_v6+e00 ()
fffffe80000b39d0 ip:ip_rput_v6+193 ()
fffffe80000b3a30 unix:putnext+1f1 ()
fffffe80000b3b50 gld:gld_recv_tagged+21d ()
fffffe80000b3b60 gld:ri_ste_def+333ebf2b ()
4. Relief/Workaround
To work around the described issue, do not configure IPv6 addresses.
To disable IPv6 on a system, run the following command as root:
# ifconfig -a6 down
Edit the "/etc/nsswitch.conf" file and change the "ipnodes" entry to
be "files" only. IPv6 will function again after a reboot.
Note: To disable IPv6 on systems across a system reboot, the
"/etc/hostname6.<interface>" files can be temporarily renamed.
Alternatively, to workaround the described issue while maintaining
IPv6 functionality, boot the system in 32-bit mode.
To specify the 32-bit kernel, as root or with equivalent privileges,
enter the following command:
# eeprom boot-file=kernel/unix
Upon the next reboot, the system will be running the 32-bit kernel.
Once the patch for this issue is installed, to reinstate 64 bit mode,
as root or with equivalent privileges, enter the following command:
# eeprom boot-file=kernel/amd64/unix
Upon the next reboot, the system will be running the 64-bit kernel.
5. Resolution
This issue is addressed in the following releases:
x86 Platform
* Solaris 10 with patch 118855-16 or later
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 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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