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AUSCERT External Security Bulletin Redistribution
ESB-2006.0710 -- [Solaris]
A Remote SSL Client May be Able to Cause a Denial of Service (DoS) of a
Solaris 10 System Running a Kernel SSL Service Instance
28 September 2006
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AusCERT Security Bulletin Summary
---------------------------------
Product: Solaris 10 kernel SSL
Publisher: Sun Microsystems
Operating System: Solaris 10
Impact: Denial of Service
Access: Remote/Unauthenticated
Original Bulletin:
http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102563-1
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Sun(sm) Alert Notification
* Sun Alert ID: 102563
* Synopsis: A Remote SSL Client May be Able to Cause a Denial of
Service (DoS) of a Solaris 10 System Running a Kernel SSL Service
Instance
* Category: Security
* Product: Solaris 10 Operating System
* BugIDs: 6401687
* Avoidance: Patch, Workaround
* State: Resolved
* Date Released: 26-Sep-2006
* Date Closed: 26-Sep-2006
* Date Modified:
1. Impact
A security vulnerability in the Solaris 10 kernel SSL feature may
allow a remote unprivileged user acting as an SSL client to panic the
system, creating a Denial of Service (DoS) condition.
2. Contributing Factors
This issue can occur in the following releases:
SPARC Platform
* Solaris 10 with patch 118822-29 or later and without patch
123304-01
x86 Platform
* Solaris 10 with patch 118844-29 or later and without patch
118855-17
Note: Solaris 8 and Solaris 9 are not impacted by this issue.
This issue only occurs on systems which have a Kernel SSL Proxy
service instance enabled. In the default configuration the service
does not exist and is not running.
To determine if a system is configured to use the Kernel SSL Proxy,
the svcs(1) command can be used to find the status of any Kernel SSL
Proxy service instances:
$ svcs svc:/network/ssl/proxy
svcs: Pattern 'svc:/network/ssl/proxy' doesn't match any instances
STATE STIME FMRI
3. Symptoms
If the described issue occurs, the system will panic with a stack
trace similar to the following:
>> $c
bcopy+0x2cc(3000453ce40, 0, 40, 2a10086b0b0, 2a10086b0f0, 3000453ce40)
md5_mac_init+0xec(30005fcbf40, 2a10086b348, 40, 0, 3000453ce40, 2a10086b740
)
crypto_mac_init_prov+0x19c(3000077c040, 0, 70119408, 2a10086b738, 0, 2a1008
6b530)
crypto_mac_init+0x114(70119408, 2a10086b738, 0, 2a10086b530, 0, 3000077c040
)
kssl_tls_P_hash+0x50(10, 2a10086b738, 40, 701199d0, d, 2a10086b840)
kssl_tls_PRF+0x80(30, 0, 80, 701199d0, d, 2a10086b840)
...
4. Relief/Workaround
To workaround this issue, disable all instances of the Kernel SSL
Proxy service and re-configure applications which may depend on them.
Note that this will remove the benefits otherwise gained by the Kernel
SSL Proxy, such as the performance enhancements.
To disable the Kernel SSL Proxy service, the svcadm(1M) command can be
used for each instance of the service:
# svcadm disable svc:/network/ssl/proxy:<instance_suffix>
To disable and delete the Kernel SSL Proxy service, the ksslcfg(1M)
can be used for each instance of the service:
# ksslcfg delete [host] <ssl_port>
5. Resolution
This issue is addressed in the following releases:
SPARC Platform
* Solaris 10 with patch 123304-01 or later
x86 Platform
* Solaris 10 with patch 118855-17 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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