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AUSCERT External Security Bulletin Redistribution
ESB-2006.0864 -- [Solaris]
A Malformed Packet Received by snmpd(1) via TCP may Cause a
Denial of Service (DoS)
5 December 2006
AusCERT Security Bulletin Summary
Publisher: Sun Microsystems
Operating System: Solaris 10
Impact: Denial of Service
CVE Names: CVE-2005-2177
Revision History: December 5 2006: CVE number has been updated
November 24 2006: Initial Release
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Sun(sm) Alert Notification
* Sun Alert ID: 102725
* Synopsis: A Malformed Packet Received by snmpd(1) via TCP may
Cause a Denial of Service (DoS)
* Category: Security
* Product: Solaris 10 Operating System
* BugIDs: 6473670
* Avoidance: Workaround
* State: Workaround
* Date Released: 22-Nov-2006
* Date Closed:
* Date Modified: 30-Nov-2006
A local or remote unprivileged user may be able to disable the
snmpd(1M) daemon causing a Denial of Service (DoS) of the SNMP
This issue is also referenced at the following URL:
2. Contributing Factors
This issue can occur in the following releases:
* Solaris 10
* Solaris 10
Note 1: Solaris 8 and Solaris 9 do not ship with the Net-SNMP software
and thus are not impacted by this issue.
Note 2: The Net-SNMP software was not bundled with Solaris prior to
Solaris 10. However, customers who have built and/or installed a
vulnerable version of Net-SNMP on any version of Solaris are at risk.
See the Net-SNMP web site to download the latest version of Net-SNMP
which addresses these issues.
Note 3: The Solaris 10 patches which address this vulnerability do not
increment the version of Net-SNMP. The version of Net-SNMP supplied
with the patches will still be reported as 5.0.9.
This issue only affects systems which have the SUNWsmagt package
installed. To determine if the SUNWsmagt package is installed on the
system, the following command can be used:
$ pkginfo -l SUNWsmagt
NAME: System Management Agent files and libraries
Note: Only Net-SNMP 5.0.9 and earlier listening on TCP:161 (as
delivered by SUNWsmagt)is affected by this issue.
To confirm the version of Net-SNMP installed on the system, the
following command can be used:
$ /usr/sfw/sbin/snmpd -v
NET-SNMP version: 5.0.9
If the version reported is 5.0.9 or earlier, and the above patch is
not installed when testing the version of snmpd(1M) that is shipped
with Solaris, then the described issue may occur.
Note: The Net-SNMP distribution of snmpd(1M) by default listens only
for UDP requests. To confirm whether "/usr/sfw/sbin/snmpd" is
listening on port 161 for TCP requests, one can telnet to port 161 on
the system in question:
$ telnet <hostname/localhost> 161
Connected to ..
Escape character is '^]'.
Connection to . closed by foreign host.
If a connection can be made to port 161 then it is likely that the
snmp(1M) daemon is listening for TCP requests.
To further verify that it is not a service other than snmpd(1M):
$ grep 161 /etc/services
The above command should only return the following:
snmpd 161/udp snmp # SMA snmp daemon
snmpd 161/tcp snmp # SMA snmp daemon
Note: Even if TCP is not listed for snmpd(1M) in /etc/services, it is
possible that snmpd(1M) has been passed arguments at startup causing
it to listen for tcp.
If the described issue occurs, high utilization of system resources by
snmpd(1), as viewed by a utility such as prstat(1M) may occur.
To work around the described issue, disable snmpd(1M) from listening
to TCP requests on port 161 (UDP is unaffected).
To Disable snmpd from listing to TCP requests on port 161, pass the
following argument to snmpd(1M) at startup:
For example :
To Verify snmpd(1M) is no longer listening for TCP requests on port
$ telnet <hostname/localhost> 161
telnet: Unable to connect to remote host: Connection refused
A final resolution is pending completion.
* Updated url in the Impact section
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
notification may only be used for the purposes contemplated by these
Copyright 2000-2006 Sun Microsystems, Inc., 4150 Network Circle, Santa
Clara, CA 95054 U.S.A. All rights reserved
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