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AUSCERT External Security Bulletin Redistribution
ESB-2009.1018
Ultra-SPARC T2 crypto provider device driver (n2cp(7D))
3 July 2009
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AusCERT Security Bulletin Summary
---------------------------------
Product: Ultra-SPARC T2 crypto provider device driver (n2cp(7D))
Publisher: Sun Microsystems
Operating System: Solaris
OpenSolaris
Impact/Access: Denial of Service -- Remote/Unauthenticated
Resolution: Patch
CVE Names: CVE-2009-2137
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Solution Type Sun Alert
Solution 258828 : A Memory Leak in the Solaris Ultra-SPARC T2 crypto
provider device driver (n2cp(7D)) may Result in Denial of Service (DoS) to
the System as a Whole
Bug ID : 6784968
Product
Solaris 10 Operating System
OpenSolaris
Date of Resolved Release : 18-Jun-2009
SA Document Body
A memory leak in the Solaris Ultra-SPARC T2 crypto provider device driver
(n2cp(7D)) may result in a Denial of Service (DoS) to the system as a
whole:
1. Impact
A memory leak in the Solaris Ultra-SPARC T2 crypto provider device driver
(n2cp(7D)) may allow a local or remote unprivileged user to cause Denial of
Service (DoS) to the system as a whole.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 without patch 140386-03
* OpenSolaris based upon builds snv_54 through snv_112
Note 1: Solaris 8 and Solaris 9 are not impacted by this issue. Solaris 10
and OpenSolaris on the x86 platform is also not impacted.
Note 2: OpenSolaris distributions may include additional bug fixes above and
beyond the build from which it was derived. The base build can be
derived as follows:
$ uname -v
snv_101
This issue only impacts systems with UltraSPARC-T2 CPUs. To determine if a
system contains this CPU, run the following command:
$ prtdiag | grep UltraSPARC-T2
If a system is equipped with an UltraSPARC-T2 CPU the output of the above
command will be similar to the following (output trimmed):
0 1167 MHz SUNW,UltraSPARC-T2 on-line
1 1167 MHz SUNW,UltraSPARC-T2 on-line
...
62 1167 MHz SUNW,UltraSPARC-T2 on-line
63 1167 MHz SUNW,UltraSPARC-T2 on-line
This issue can be exploited remotely only in cases where there are services
running on the system that use Solaris Crypto Framework for MAC/HMAC
processing. To determine if the n2cp driver on the system is used for such
processing, run the following command:
$ kstat -m n2cp | grep mac
If any of the counters are greater than zero then the driver is used for
that number of computations.
3. Symptoms
If the described issue occurs the kernel memory allocations may grow (which
could be examined using a kernel debugger such as mdb(1)) and messages
similar to the following may be displayed on the console:
n2cp: [ID 504468 kern.warning] WARNING:
alloc_hmac_ctx: keylen(512) > maxlen(32)
The following command can be used to observe the context allocations:
# echo '::kmastat ! grep n2cp_ctx_cache' | mdb -k
If the value in the 5th column (memory in use) increases over time then the
issue described in this Sun Alert has occurred.
4. Workaround
To work around the described issue, disable n2cp driver to be used for HMAC
processing using the following command:
# /usr/sbin/cryptoadm disable provider=n2cp/0
mechanism=CKM_MD5_HMAC,CKM_SHA_1_HMAC,CKM_SHA256_HMAC,CKM_MD5_HMAC_GENERAL,
CKM_SHA_1_HMAC_GENERAL,CKM_SHA256_HMAC_GENERAL,CKM_SSL3_MD5_MAC,CKM_SSL3_SHA1_MAC
Applying this work around may impact performance of MAC/HMAC processing. For
example, slowing down SSL connection processing. This impact can be
noticeable depending on the workload.
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 140386-03 or later
* OpenSolaris based upon builds snv_113 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 2000-2009 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
CA 95054 U.S.A. All rights reserved.
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