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Liebe Kolleginnen und Kollegen,
soeben erreichte uns nachfolgendes Sun Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.
6857395 – Schwachstelle im Cassini Gigabit-Ethernet Treiber bei der
Verarbeitung von Jumbo-Frames
Im Solaris Cassini Gigabit-Ethernet Treiber (ce(7D)) werden Jumbo
Frames nicht korrekt verarbeitet, wenn die Pruefsummenverifikation in
der Hardware durchgefuehrt wird. Ein Angreifer kann diese
Schwachstelle ueber das Netzwerk dazu ausnutzen, eine Kernel-Panic
auszuloesen (Denial of Service), indem er entsprechend aufgebaute
Jumbo-Frames an das System sendet.
Die Existenz der Schwachstelle koennen Sie wie folgt erkennen:
Um festzustellen, ob Jumbo Frames und Hardware Checksumming fuer eine
Cassini Karte aktiviert sind, benutzen Sie fuer jede Cassini Karte die
folgenden Kommandos:
# ndd -set /dev/ce instance 1 # ndd -get /dev/ce accept_jumbo
Ein Rueckgabewert von 1 zeigt an, dass die Verarbeitung von Jumbo
Frames aktiviert ist.
# echo “dohwcksum/X” | mdb -k dohwcksum: 1
Ein Rueckgabewert von 1 zeigt an, das Hardware Checksumming aktiviert
ist.
Falls die Schwachstelle ausgenutzt wurde, zeigt sich ein Stack-Trace
aehnlich dem folgenden:
panic[cpu0]/thread=2a1008a1ca0: BAD TRAP: type=31 rp=2a1008a1270
addr=310cf2e6000 mmu_fsr=0 bcksum+20 () ip_rput_data_v6+1238 ()
ip_rput_v6+870 () putnext+208 ()
Betroffen sind die folgenden Software Pakete und Plattformen:
Solaris 10
OpenSolaris
SPARC Plattform
* Solaris 10 ohne Patch 141414-10
* OpenSolaris basierend auf den Builds snv_01 bis snv_82, und snv_111
bis snv_122
x86 Plattform
* Solaris 10 ohne Patch 141415-10
* OpenSolaris basierend auf den Builds snv_01 bis snv_82, und snv_111
bis snv_122
Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.
Hersteller Advisory:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-265608-1
(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)
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 265608 : Security Vulnerability with the Solaris IPv6
Networking Stack Involving the Cassini Gigabit-Ethernet Device Driver
and Jumbo Frames
Related Categories
* Home>Content>Sun Alert Criteria Categories>Availability
* Home>Content>Sun Alert Criteria Categories>Security
* Home>Content>Sun Alert Release Phase>Resolved
Bug ID
6857395
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release
02-Sep-2009
SA Document Body
Security Vulnerability with the Solaris IPv6 Networking Stack :
1. Impact
A security vulnerability with the Solaris IPv6 networking stack
involving the
Cassini Gigabit-Ethernet Device Driver (ce(7D)) and jumbo frames may
allow
a remote user to panic the system. This is a type of Denial of Service
(DoS) condition.
Note: A similar issue exists for systems using IPv4 networking. See Sun
Alert 257008 for details:
http://sunsolve.sun.com/search/document.do?assetkey=1-66-257008-1
2. Contributing Factors
This issue can occur in the following releases:
SPARC platform
* Solaris 10 without patch 141414-10
* OpenSolaris based upon builds snv_01 through snv_82, and snv_111
through snv_122
x86 platform (unconfirmed)
* Solaris 10 without patch 141415-10
* OpenSolaris based upon builds snv_01 through snv_82, and snv_111
through snv_122
Notes: Solaris 9 and Solaris 8 are not impacted by this issue.
A system is only vulnerable to this issue if it is using a GigaSwift
Ethernet Adapter (CE)
interface (ce(7D)) which has been configured to accept jumbo frames and
is configured for IPv6 and hardware checksumming is enabled.
To determine if there are any active CE interfaces present on a system,
run the following command:
$ /sbin/ifconfig -a inet6 | /bin/grep ^ce
ce1: flags=2004841
To determine if jumbo frames are in use on a CE interface, use the
following ndd commands:
# ndd -set /dev/ce instance 1
# ndd -get /dev/ce accept_jumbo
1
The above two commands must be repeated for each CE interface present
on
the system (adjusting the instance number in the first command
accordingly).
The file /kernel/drv/ce.conf may also include the accept_jumbo=1
directive, either globally or for a subset of interfaces, but the above
ndd commands will give the current state of the running interfaces.
To determine whether hardware checksumming is enabled, run the
following
command as root:
# echo “dohwcksum/X” | /usr/bin/mdb -k
dohwcksum:
dohwcksum: 1
A value of 1 indicates that hardware checksumming is enabled (default
value).
A value of 0 indicates hardware checksumming is disabled.
Note 3: Some third party storage systems have been seen to generate
jumbo ethernet packets which may trigger this issue and cause the
Solaris system to panic.
Note 4: The use of the kernel memory debugging facility ‘kmem_flags’
will greatly increase the likelihood of a panic. To determine if
kmem_flags is set, run the following command as root:
# echo “kmem_flags/X” | /usr/bin/mdb -k
kmem_flags:
kmem_flags: 0
A value of zero indicates kmem_flags is not set. Any other value
indicates one or more of the kmem debugging facilities is active.
3. Symptoms
If the described issue occurs, the system will panic with a BAD TRAP
type 31, and a stack trace similar to the following:
panic[cpu0]/thread=2a1008a1ca0: BAD TRAP: type=31 rp=2a1008a1270
addr=310cf2e6000 mmu_fsr=0
bcksum+20 ()
ip_rput_data_v6+1238 ()
ip_rput_v6+870 ()
putnext+208 ()
4. Relief/Workaround
There are two possible workarounds known at this time.
Workaround A:
Disable hardware checksumming. To do this, place the following line
in /etc/system and reboot:
set ip:dohwcksum = 0
Note: This may impact performance.
Workaround B:
Prevent the network from sending jumbo frames to this host by disabling
jumbo frames on the entire subnet.
Note: This may impact performance.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 141414-10 or later
* OpenSolaris based upon build snv_123 or later
x86 platform
* Solaris 10 with patch 141415-10 or later
* OpenSolaris based upon build snv_123 or later
For more information on Security Sun Alerts, see Technical Instruction
ID 213557
http://sunsolve.sun.com/search/document.do?assetkey=1-61-213557-1
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,
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AND ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
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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
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