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             AUSCERT External Security Bulletin Redistribution

                      ESB-2009.0385 -- [OpenSolaris]
                OpenSolaris SCTP Sockets: Denial of Service
                               27 April 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              OpenSolaris
Publisher:            Sun Microsystems
Operating System:     OpenSolaris
Impact:               Denial of Service
Access:               Existing Account
CVE Names:            CVE-2009-1359

Original Bulletin:    
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-66-257331-1

Revision History:     April 27 2009: Added CVE
                      April 22 2009: Initial Release

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Solution Type: Sun Alert

Solution  257331 :   Security Vulnerability in OpenSolaris SCTP Sockets May 
Allow Unprivileged Users to Panic the System
          
Bug ID: 6796351

Product
OpenSolaris

Date of Resolved Release: 20-Apr-2009

SA Document Body
Security Vulnerability in OpenSolaris SCTP Sockets May Allow Unprivileged 
Users to Panic the System

1. Impact

Due to a security vulnerability in SCTP sockets, OpenSolaris systems may
allow an unprivileged local user to panic the system and thereby cause a
denial of service (DoS).

2. Contributing Factors

This issue can occur in the following releases:
   SPARC Platform
     * OpenSolaris based upon builds snv_106 through snv_107

   x86 Platform
     * OpenSolaris based upon builds snv_106 through snv_107

Notes: 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_86
Solaris 8, 9 and 10 are not impacted by this issue.

3. Symptoms

If this issue is exploited to cause a denial of service, the kernel panics
and the lower part of the stack trace would be similar to the one below. The
key identifying features of the panic is the presence of "sosctp_close()"
and "sctp_sack()" in the stack trace.
       sctp_sack+0xcf(ffffff09c5b45928, 0)
       sctp_recvd+0xe8(ffffff09c5b45928, 19000)
       sosctp_close+0x4c(ffffff05727bcc90, 3, ffffff01d9151608)
       socket_close_internal+0x3a(ffffff05727bcc90, 3,ffffff01d9151608)
       socket_vop_close+0xf2(ffffff01dfa56800, 3, 1, 0, ffffff01d9151608, 0)
       fop_close+0x71(ffffff01dfa56800, 3, 1, 0, ffffff01d9151608, 0)
       closef+0x9e(ffffff01d7e157d8)
       closeandsetf+0x406(5, 0)
       close+0x18(5)
       sys_syscall32+0x1fc()

4. Workaround

There is no workaround to this issue. Please see the Resolution section 
below.

5. Resolution

This issue is addressed in the following releases:
   SPARC Platform
     * OpenSolaris based upon builds snv_108 or later

   x86 Platform
     * OpenSolaris based upon builds snv_108 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,
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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