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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
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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
- --------------------------BEGIN INCLUDED TEXT--------------------
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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