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AUSCERT External Security Bulletin Redistribution
ESB-2008.1133 -- [Solaris]
A Security Vulnerability in IPv4 Forwarding may Allow a
Remote User to Panic the System
17 December 2008
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Solaris 10 Operating System
OpenSolaris
Publisher: Sun Microsystems
Operating System: Solaris
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-241126-1
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Solution Type Sun Alert
Solution 241126 : A Security Vulnerability in IPv4 Forwarding may Allow
a Remote User to Panic the System
Bug ID
6478933
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release
15-Dec-2008
SA Document Body
Solaris 10 kernel patches 120011-14 (SPARC) and 120012-14 (x86) introduced a
security vulnerability in IPv4 forwarding:
1. Impact
Solaris 10 kernel patches 120011-14 (SPARC) and 120012-14 (x86) introduced a
security vulnerability in IPv4 forwarding which may allow a remote
unprivileged user to panic the system. This is a type of Denial of Service
(DoS).
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 with patch 120011-14 and without patch 138888-01
* OpenSolaris based upon builds snv_47 through snv_82
x86 Platform
* Solaris 10 with patch 120012-14 and without patch 138889-01
* OpenSolaris based upon builds snv_47 through snv_82
Note 1: Solaris 8 and 9 are not impacted by this issue.
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: A system is only affected by this issue if it is configured to use
IPv4, has a network route with a gateway of 127.0.0.1, and the route does
not have the blackhole flag set. To determine if a system is configured this
way, the following command can be used:
$ netstat -rnf inet
Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
default 192.168.0.1 UG 1 2254
12.1.1.1 127.0.0.1 UH 1 454 lo0
13.0.0.0 127.0.0.1 U 1 112 lo0
192.168.0.0 192.168.0.5 U 1 1357 bge0
224.0.0.0 192.168.0.5 U 1 0 bge0
127.0.0.1 127.0.0.1 UH 3 744 lo0
In the above example, routes 12.1.1.1 and 13.0.0.0 may place the system at
risk. Individual routes must then be checked using the "route get" command:
$ route get 12.1.1.1 | grep "flags:"
flags: <UP,DONE,STATIC>
$ route get 13.0.0.0 | grep "flags:"
flags: <UP,DONE,STATIC,BLACKHOLE>
The route to 12.1.1.1 does not have the BLACKHOLE flag set, and may be
affected by this issue.
The route to 13.0.0.0 has the BLACKHOLE flag set, and therefore this route is
not affected.
Note 4: This issue affects systems regardless of whether IPv4 forwarding has
been configured (either using the ipv4-forwarding option of routeadm(1M) or
setting the ip_forwarding kernel tunable with ndd(1M)).
3. Symptoms
If the described issue occurs, the affected system will panic and may produce
a crashdump with a panic string and a stack trace similar to the following:
BAD TRAP: type=31 rp=2a100047250 addr=1d8 mmu_fsr=0 occurred in module
"ip" due to a NULL pointer dereference
ire_add+0xdc(2a1008193b0, 0, 0, 0, 1, 600008338c8)
ire_forward+0x524(20, 60000833890, 60000833980, 60000086388,
6000012d848, 30006c36000)
ip_fast_forward+0xd8(e0000000, d010101, 600002af428, 60000936ae0, 0, 1)
ip_input+0x5a0(600012826e0, 3000851e040, 0, 600002af428, 0, 0)
i_dls_link_rx+0x1f0(60000333d20, 3000851e040, 0, 60000936ae0,
2a100819710, 2a100819718)
mac_rx+0x50(60000331e08, 3000851e040, 60000936ae0, 12f8100, 0,
600002f83d0)
bge_receive+0x408(46, 3000818e000, 60000936ae0, 60000936ae0,
ffffffffffffffff, 2f5c)
bge_intr+0x188(3000818e000, 10000001f, 0, 2c00, 30008190de0, 0)
pci_intr_wrapper+0xb4(30004f8e668, 6000030df10, 0, 0, 0, 600002818c0)
intr_thread+0x170(b, 0, 0, 30005393778, 8, 1)
4. Workaround
To work around this issue, specify the "blackhole flag" when adding the route:
# route add -blackhole 12.1.1.1 127.0.0.1
Note: This will cause the system to return an "ICMP Destination Unreachable"
message in response to any packets destined for 12.1.1.1.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 138888-01 or later
* OpenSolaris based upon builds snv_83 or later
x86 Platform
* Solaris 10 with patch 138889-01 or later
* OpenSolaris based upon builds snv_83 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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