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             AUSCERT External Security Bulletin Redistribution

                        ESB-2006.0161 -- [Solaris]
        Sun TCP Connections May Experience Performance Degradation
                If Certain ICMP Error Messages Are Received
                             11 December 2006

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

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

Product:              Solaris 10 Operating System
                      Solaris 9 Operating System
                      Solaris 8 Operating System
                      Solaris 7 Operating System
Publisher:            Sun Microsystems
Operating System:     Solaris
Impact:               Denial of Service
Access:               Remote/Unauthenticated
CVE Names:            CAN-2004-0791 CAN-2004-0790

Ref:                  ESB-2006.0004

Revision History:  December 11 2006: This issue is now resolved
                   December  5 2006: Sun has released patches for
                                     Solaris 7 (x86)
                   April    21 2006: Sun has released patches for
                                     Solaris 9 (SPARC and x86) and
                                     Solaris 8 (x86)
                   March     6 2006: Initial Release

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Sun(sm) Alert Notification
     * Sun Alert ID: 101658 (formerly 57746)
     * Synopsis: Sun TCP Connections May Experience Performance
       Degradation If Certain ICMP Error Messages Are Received
     * Category: Security
     * Product: Solaris 9 Operating System, Solaris 10 Operating System,
       Solaris 7 Operating System, Solaris 8 Operating System
     * BugIDs: 5084452
     * Avoidance: Patch
     * State: Resolved
     * Date Released: 12-Apr-2005, 07-Dec-2006
     * Date Closed: 07-Dec-2006
     * Date Modified: 07-Jun-2005, 02-Feb-2006, 03-Mar-2006, 21-Mar-2006,
       12-Apr-2006, 29-Nov-2006, 07-Dec-2006

1. Impact

   This Sun Alert describes the Sun specific impact of the issues
   described in the Internet-Draft (I-D) titled "ICMP attacks against
   TCP" written by Fernando Gont. The I-D describes how TCP(7P)
   connections could be reset and disconnected as a result of ICMP(7P)
   error messages. Solaris will not drop established TCP connections
   based on ICMP errors. There is a theoretical possibility that a TCP
   connection which is in the process of being set up could be terminated
   before being established. However, there is no risk of data corruption
   or compromise in this scenario.

   The draft also describes ICMP messages which could impact the
   performance of existing TCP connections. This issue affects all
   current versions of Solaris and thus Sun plans on improving how ICMP
   errors are handled to further mitigate the impact of such ICMP
   messages.

   This issue is also described in the following documents:

   IETF Internet Draft at
   http://www.ietf.org/internet-drafts/draft-gont-tcpm-icmp-attacks-03
   .txt

   CERT Vulnerability Note VU#222750 at
   http://www.kb.cert.org/vuls/id/222750

   CVEs CAN-2004-0790 at
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0790

   CVEs CAN-2004-0791 at
   http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0791

2. Contributing Factors

   This issue can occur in the following releases:

   SPARC Platform
     * Solaris 7 without patch 106541-44
     * Solaris 8 without patch 116965-19
     * Solaris 9 without patch 118305-08
     * Solaris 10 without patch 118822-27

   x86 Platform
     * Solaris 7 without patch 106542-43
     * Solaris 8 without patch 116966-18
     * Solaris 9 without patch 117470-07
     * Solaris 10 without patch 118844-28

3. Symptoms

   In order to verify if ICMP error messages are being sent to a specific
   system on the network, a network monitoring tool such as snoop(1M) can
   be used from either the specific system or another system on the same
   network.

   The following command can be run (as "root"):
    # snoop -o <output-file>

   Afterwards, the snoop(1M) utility can display the packets captured in
   the "output-file" using the "-v" and "-i" options, as in:
    # snoop -v -i output-file icmp icmp6

   and inspect the output for ICMP packets which will look similar to the
   following:
    ICMP:  ----- ICMP Header -----
    ICMP:
    ICMP:  Type = 0 (Echo reply)
    ICMP:  Code = 0 (ID: 5417 Sequence number: 0)
    ICMP:  Checksum = be96
    ICMP:

   If the "Type" value and the "Code" value (for multiple packets) are
   equal to any of the following combinations:
    Type    Code    Name
    ----    ----    -----------------
     4       0      Source Quench
     3       *      Net/Host/Protocol/Port Unreachable, etc.
     5       *      Redirect
     6       0      Alternate Host Address
     11      *      Time Exceeded
     12      *      Parameter Problem

   then the system may be the target of the described ICMP issue. 

4. Relief/Workaround

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

5. Resolution

   This issue is addressed in the following releases:

   SPARC Platform
     * Solaris 7 with patch 106541-44 or later
     * Solaris 8 with patch 116965-19 or later
     * Solaris 9 with patch 118305-08 or later
     * Solaris 10 with patch 118822-27 or later

   x86 Platform
     * Solaris 7 with patch 106542-43 or later
     * Solaris 8 with patch 116966-18 or later
     * Solaris 9 with patch 117470-07 or later
     * Solaris 10 with patch 118844-28 or later

Change History

   07-Jun-2005:
     * Correction to CERT URL made in Impact section

   02-Feb-2006:
     * Updated Contributing Factors and Resolution sections

   03-Mar-2006:
     * Updated Contributing Factors and Resolution sections

   21-Mar-2006:
     * Updated Contributing Factors and Resolution sections

   12-Apr-2006:
     * Updated Contributing Factors and Resolution sections

   29-Nov-2006:
     * Updated Contributing Factors and Resolution sections

   07-Dec-2006:
     * Updated Contributing Factors and Resolution sections
     * State: Resolved

   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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