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S-00-05.htm
Posted Jan 10, 2000

S-00-05.htm

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<title>CERT-NL S-00-05</title>
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<table border="0" width="100%" cellspacing="0">
<tr>
<td colspan="3" bgcolor="#009966" width="760"><blockquote>
<p><font face="Arial"><strong><big>Security Advisory</big></strong></font></p>
</blockquote>
</td>
<td colspan="2" align="right" bgcolor="#009966" width="103"><img src="../../hs-kader-logo.gif" alt="hs-kader-logo.gif (586 bytes)" WIDTH="100" HEIGHT="41"></td>
<td align="center" bgcolor="#009966" colspan="2" width="95"><strong><font face="Arial">CERT-NL</font></strong></td>
</tr>
<tr>
<td width="115" bgcolor="#99CC99">Author/Source</td>
<td width="6" bgcolor="#99CC99">:</td>
<td width="100%">Jan Meijer</td>
<td width="96" bgcolor="#99CC99">Index</td>
<td colspan="2" width="6" bgcolor="#99CC99">:</td>
<td align="right" width="90">S-00-05</td>
</tr>
<tr>
<td width="115" bgcolor="#99CC99">Distribution</td>
<td width="6" bgcolor="#99CC99">:</td>
<td width="627">World</td>
<td width="96" bgcolor="#99CC99">Page</td>
<td colspan="2" width="6" bgcolor="#99CC99">:</td>
<td align="right" width="90">1</td>
</tr>
<tr>
<td width="115" bgcolor="#99CC99">Classification</td>
<td width="6" bgcolor="#99CC99">:</td>
<td width="627">External</td>
<td width="96" bgcolor="#99CC99">Version</td>
<td colspan="2" width="6" bgcolor="#99CC99">:</td>
<td align="right" width="90">1</td>
</tr>
<tr>
<td width="115" bgcolor="#99CC99" valign="top">Subject</td>
<td width="6" bgcolor="#99CC99" valign="top">:</td>
<td width="627" bgcolor="#d4d4d4"><strong><big>Security Vulnerability with PMTU strategy</big></strong></td>
<td width="96" bgcolor="#99CC99" valign="top">Date</td>
<td colspan="2" width="6" bgcolor="#99CC99" valign="top">:</td>
<td align="right" width="90" bgcolor="#D4D4D4" valign="top">24-Jan-2000</td>
</tr>
</table>
</div>

<p>By courtesy of HP we received information on a vulnerability in the PMTU strategy of
HP-UX. An HP-UX 10.30/11.00 system can be used as an IP traffic amplifier.</p>

<p>CERT-NL recommends to follow the in the advisory mentioned procedure.</p>

<hr size="1">

<p>Digest Name: Daily Security Bulletins Digest<br>
Created: Mon Jan 24 3:00:03 PST 2000</p>

<p>Table of Contents:</p>
<div align="left">

<table border="0">
<tr>
<td>Document ID</td>
<td>Title</td>
</tr>
<tr>
<td><hr size="1">
</td>
<td><hr size="1">
</td>
</tr>
<tr>
<td>HPSBUX0001-110</td>
<td>Security Vulnerability with PMTU strategy</td>
</tr>
</table>
</div>

<p>The documents are listed below.</p>

<hr size="1">
<div align="left">

<table border="2">
<tr>
<td>Document ID:</td>
<td>HPSBUX0001-110</td>
</tr>
<tr>
<td>Date Loaded:</td>
<td>20000123</td>
</tr>
<tr>
<td>Title:</td>
<td>Security Vulnerability with PMTU strategy</td>
</tr>
</table>
</div>

<p>&nbsp;</p>
<div align="left">

<table border="2">
<tr>
<td>HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #00110, 24 Jan 2000</td>
</tr>
</table>
</div>

<p>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.</p>

<hr size="1">
<div align="left">

<table border="0">
<tr>
<td valign="top">PROBLEM:</td>
<td>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.</td>
</tr>
<tr>
<td valign="top">PLATFORM:</td>
<td>HP-UX release 10.30 and 11.00 only.</td>
</tr>
<tr>
<td valign="top">DAMAGE: </td>
<td>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.</td>
</tr>
<tr>
<td valign="top">SOLUTION:</td>
<td>Set the NDD parameter ip_pmtu_strategy to 1.</td>
</tr>
<tr>
<td valign="top">AVAILABILITY:</td>
<td>This capability is already available.</td>
</tr>
</table>
</div>

<hr size="1">

<p>I.</p>

<blockquote>
<p><strong>A. Background</strong><br>
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. <br>
This is the default strategy for determining PMTU.</p>
<p><strong>B. Recommended solution</strong><br>
Reference ndd manpage (1M), /etc/rc.config.d/nddconf</p>
<p>To ensure that this parameter is set each time the system is booted, add the following
lines to /etc/rc.config.d/nddconf</p>
<blockquote>
<p>TRANSPORT_NAME[<index>]=ip<br>
NDD_NAME[<index>]=ip_pmtu_strategy<br>
NDD_VALUE[<index>]=1</p>
</blockquote>
<p>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.</p>
<p>Once these changes have been made, execute the following command:</p>
<blockquote>
<p>/usr/bin/ndd -c</p>
</blockquote>
<p>This sets all of the options specified in the file /etc/rc.config.d/nddconf.</p>
<p>To verify that the parameter is set correctly, use the following command.</p>
<blockquote>
<p>/usr/bin/ndd -get /dev/ip ip_pmtu_strategy</p>
</blockquote>
<p>This should report a value of 1.</p>
<p>Another way to change the ip_pmtu_strategy parameter on a running system is to use the
following NDD command:</p>
<blockquote>
<p>/usr/bin/ndd -set /dev/ip ip_pmtu_strategy 1</p>
</blockquote>
<p>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</p>
<p><strong>C. To subscribe to</strong> automatically receive future NEW HP Security
Bulletins from the HP IT Resource Center via electronic mail, do the following:</p>
<p>Use your browser to get to the HP IT Resource Center page at:</p>
<blockquote>
<p><a href="http://us-support.external.hp.com">http://us-support.external.hp.com</a><br>
(for US, Canada, Asia-Pacific, & Latin-America)<br>
<a href="http://europe-support.external.hp.com">http://europe-support.external.hp.com</a>
&nbsp; (for Europe)</p>
</blockquote>
<p>Under the Maintenance and Support Menu (Electronic Support Center):<br>
click on the "more..." link. Then -</p>
<p>To -subscribe- to future HP Security Bulletins, or<br>
To -review- bulletins already released<br>
click on "Support Information Digests" near the bottom of the page, under
"Notifications".</p>
<p>Login with your user ID and password (or register for one).<br>
(Remember to save the User ID assigned to you, and your password).</p>
<p>On the "Support Information Digest Main" page:<br>
click on the "HP Security Bulletin Archive".</p>
<p>Once in the archive the third link is to our current Security Patch Matrix. Updated
daily, this matrix categorizes security patches by platform/OS release, and by bulletin
topic.<br>
<br>
The security patch matrix is also available via anonymous ftp:</p>
<blockquote>
<p><a href="ftp://us-ffs.external.hp.com/~ftp/export/patches/hp-ux_patch_matrix">ftp://us-ffs.external.hp.com/~ftp/export/patches/hp-ux_patch_matrix</a></p>
</blockquote>
<p><strong>E. To report new security vulnerabilities</strong>, send email to <a href="mailto:security-alert@hp.com">security-alert@hp.com</a>.</p>
<p>Please encrypt any exploit information using the security-alert PGP key, available from
your local key server, or by sending a message with a -subject- (not body) of 'get key'
(no quotes) to <a href="mailto:security-alert@hp.com">security-alert@hp.com</a>.</p>
<p>Permission is granted for copying and circulating this Advisory to Hewlett-Packard (HP)
customers (or the Internet community) for the purpose of alerting them to problems, if and
only if, the Advisory is not edited or changed in any way, is attributed to HP, and
provided such reproduction and/or distribution is performed for non-commercial purposes.</p>
<p>Any other use of this information is prohibited. HP is not liable for any misuse of
this information by any third party.</p>
</blockquote>

<hr size="1">

<p>-----End of Document ID: HPSBUX0001-110--------------------------------------</p>

<hr>

<p><font color="#006041"><strong>CERT-NL</strong> </font>is the Computer Emergency
Response Team for SURFnet customers. SURFnet is the Dutch network for educational,
research and related institutes. <strong><font color="#006041">CERT-NL</font></strong> is
a member of the Forum of Incident Response and Security Teams (<a href="http://www.first.org">FIRST</a>).</p>

<p>All <strong><font color="#006041">CERT-NL</font></strong> material is available under:<br>
&nbsp;&nbsp; <a href="http://cert.surfnet.nl/">http://cert.surfnet.nl/</a></p>

<p>In case of computer or network security problems please contact your local
CERT/security-team or<font color="#006041"> <strong>CERT-NL</strong></font>&nbsp; (if your
institute is NOT a SURFnet customer please address the appropriate (local)
CERT/security-team).</p>

<p><strong><font color="#006041">CERT-NL</font></strong> is one/two hour(s) ahead of UTC
(GMT) in winter/summer,<br>
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).</p>
<div align="left">

<table border="0" width="80%" bgcolor="#DCDCDC" cellspacing="0" height="192">
<tr>
<td valign="top" height="24">Email:</td>
<td height="24"><a href="mailto:cert-nl@surfnet.nl">cert-nl@surfnet.nl</a></td>
<td height="24">ATTENDED REGULARLY ALL DAYS</td>
</tr>
<tr>
<td valign="top" height="24">Phone:</td>
<td height="24">+31 302 305 305</td>
<td height="24">BUSINESS HOURS ONLY</td>
</tr>
<tr>
<td valign="top" height="24">Fax: </td>
<td height="24">+31 302 305 329 </td>
<td height="24">BUSINESS HOURS ONLY</td>
</tr>
<tr>
<td valign="top" height="112">Snailmail:</td>
<td height="112">SURFnet bv<br>
Attn. CERT-NL<br>
P.O. Box 19035<br>
NL - 3501 DA&nbsp; UTRECHT<br>
The Netherlands</td>
<td height="112">.</td>
</tr>
</table>
</div>

<p>NOODGEVALLEN:&nbsp;&nbsp;&nbsp; 06 22 92 35 64&nbsp;&nbsp;&nbsp;&nbsp; ALTIJD
BEREIKBAAR<br>
EMERGENCIES : +31 6 22 92 35 64&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ATTENDED AT ALL TIMES<br>
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:<br>
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED* PROCEDURE FOR DEALING
WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT TO CERT-NL IN AN APPROPRIATE MANNER.
CERT-NL WILL THEN CONTACT YOU.</p>

<hr>

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<td><img src="../../hs-c-1999.gif" alt="copyright
SURFnet 1999" WIDTH="100" HEIGHT="19"><a href="mailto:redactie@SURFnet.nl"><br>
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<td width="100%" valign="middle"><font face="Geneva, Arial" size="1"><a href="http://www.surfnet.nl/home.html" target="_top">Homepage</a> | <a href="http://www.surfnet.nl/diensten/">Diensten </a>| <a href="http://www.surfnet.nl/diensten/beveiliging/">Beveiliging</a> | <a href="http://www.surfnet.nl/diensten/beveiliging/cert" target="_top">CERT-NL home</a>|:</font></td>
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