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             AUSCERT External Security Bulletin Redistribution

                        ESB-2007.0481 -- [Solaris]
        Security Vulnerabilities in the KSSL Kernel Module May Lead
                             to a System Panic
                                3 July 2007

===========================================================================

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

Product:              KSSL Kernel Module
Publisher:            Sun Microsystems
Operating System:     Solaris 10
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-3470

Original Bulletin:  
  http://sunsolve.sun.com/search/printfriendly.do?assetkey=1-26-102918-1

Revision History:   July 3 2007: Added CVE Name
                   June 29 2007: Initial Release

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Sun(sm) Alert Notification
     * Sun Alert ID: 102918
     * Synopsis: Security Vulnerabilities in the KSSL Kernel Module May
       Lead to a System Panic
     * Category: Security, Availability
     * Product: Solaris 10 Operating System
     * BugIDs: 6497668, 6539337
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 27-Jun-2007
     * Date Closed: 27-Jun-2007
     * Date Modified: 

1. Impact

   Due to security vulnerabilities related to the handling of memory
   buffers containing Secure Socket Layer (SSL) records, an unprivileged
   local or remote user may be able to panic a Solaris 10 system that has
   been configured to act as a SSL proxy. This would result in a Denial
   of Service (DoS) to the system.

2. Contributing Factors

   These issues can occur in the following releases:

   SPARC Platform
     * Solaris 10 with patch 121474-01 or later and without patch
       125100-10

   x86 Platform
     * Solaris 10 with patch 121475-01 or later and without patch
       125101-10

   Notes:
    1. Solaris 8 and Solaris 9 are not impacted by these issues since
       they do not ship the KSSL implementation. Solaris 10 3/05 did not
       ship with KSSL, but it was delivered via patches for Solaris 10
       and was included in Solaris 10 6/06 onwards.
    2. These issues only affect systems configured with the KSSL proxy.
       In the default configuration, the service does not exist and is
       not running.

   The following command can be run to determine if the KSSL proxy was
   configured on a system:
    $ svcs | grep kssl
    online         Apr_27   svc:/network/ssl/proxy:kssl-INADDR_ANY-443

3. Symptoms

   If these issues have been exploited, the system panic would produce
   the following stack trace:
    kssl_handle_record+0x80(6000383b250, 60002a04000, 2a100c97540, 6000112d200,

    60003889c40, 0)
    strsock_kssl_input+0x14(600037f6380, 60001081540, 0, 0, 0, 60002744730)
    kstrgetmsg+0x51c(60001081540, 0, 2a100c97a10, 6000287ab28, 0, 1)
    sotpi_recvmsg+0x290(60002744730, 2a100c97870, 2a100c97a10, 2, 0, 7000)
    socktpi_read+0x44(600037f6380, 2a100c97a10, 600008022c8, 600008022c8, 0,
    60002744730)
    fop_read+0x20(600037f6380, 2a100c97a10, 0, 600008022c8, 0, 135127c)
    read+0x274(101, 0, 600027c10d8, 1f40, 83, 0)
    syscall_trap32+0xcc(101, 154b20, 1f40, 1, 493e0, 8)

   Note: Other possible stack traces are possible containing calls to
   routines from the KCF module. 

4. Relief/Workaround

   Until patches are applied, sites may wish to disable the KSSL proxy so
   that SSL processing will be done in "userland" only. This may degrade
   the performance of servicing SSL streams.

   For example, to disable the KSSL proxy listening on the default TCP
   port (port 443), the following command can be run:
    # ksslcfg delete 443

   Note: This command will also delete the KSSL service.

5. Resolution

   These issues are addressed in the following releases:

   SPARC Platform
     * Solaris 10 with patch 125100-10 or later

   x86 Platform
     * Solaris 10 with patch 125101-10 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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