Date: Mon, 24 Jan 2000 10:01:07 -0800
From: Aleph One <[email protected]>
To: [email protected]Subject: Security Bulletins Digest
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Digest Name: Daily Security Bulletins Digest
Created: Mon Jan 24 3:00:03 PST 2000
Table of Contents:
Document ID Title
--------------- -----------
HPSBUX0001-110 Security Vulnerability with PMTU strategy
The documents are listed below.
-------------------------------------------------------------------------------
Document ID: HPSBUX0001-110
Date Loaded: 20000123
Title: Security Vulnerability with PMTU strategy
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HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #00110, 24 Jan 2000
-------------------------------------------------------------------------
The information in the following Security Advisory should be acted upon
as soon as possible. Hewlett-Packard Company will not be liable for any
consequences to any customer resulting from customer's failure to fully
implement instructions in this Security Advisory as soon as possible.
-------------------------------------------------------------------------
PROBLEM: An HP-UX 10.30/11.00 system can be used as an IP traffic
amplifier. Small amounts of inbound traffic can result in
larger amounts of outbound traffic.
PLATFORM: HP-UX release 10.30 and 11.00 only.
DAMAGE: Depending upon the amount and nature of inbound traffic, an
HP-UX 10.30/11.00 system can be used to flood a target system
with IP packets which could result in a denial of service.
SOLUTION: Set the NDD parameter ip_pmtu_strategy to 1.
AVAILABILITY: This capability is already available.
-------------------------------------------------------------------------
I.
A. Background
HP provides a proprietary method for determining PMTU. When
traffic needs to be routed to a destination for which the optimum
MTU has not been determined, ICMP packets are used to discover
the MTU for that path while data traffic is shipped in parallel.
This is the default strategy for determining PMTU.
B. Recommended solution
Reference ndd manpage (1M), /etc/rc.config.d/nddconf
To ensure that this parameter is set each time the system
is booted, add the following lines to /etc/rc.config.d/nddconf
TRANSPORT_NAME[<index>]=ip
NDD_NAME[<index>]=ip_pmtu_strategy
NDD_VALUE[<index>]=1
The value of <index> is an integer from 0 to 99. The first
parameter specified in the file should use an <index> of
0, the second an <index> of 1, and so on.
Once these changes have been made, execute the following
command:
/usr/bin/ndd -c
This sets all of the options specified in the file
/etc/rc.config.d/nddconf.
To verify that the parameter is set correctly, use the following
command.
/usr/bin/ndd -get /dev/ip ip_pmtu_strategy
This should report a value of 1.
Another way to change the ip_pmtu_strategy parameter on a running
system is to use the following NDD command:
/usr/bin/ndd -set /dev/ip ip_pmtu_strategy 1
This setting will only last until the system is rebooted
at which point the value of the parameter will be determined by the
default value of 2 or whatever value is set in
/etc/rc.config.d/nddconf
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E. To report new security vulnerabilities, send email to
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________________________________________________________________________
-----End of Document ID: HPSBUX0001-110--------------------------------------
