Cisco Security Advisory: A device running Internetwork Operating System (IOS) and enabled for the Open Shortest Path First (OSPF) protocol is vulnerable to a Denial of Service (DoS) attack from a malformed OSPF packet. The OSPF protocol is not enabled by default. The vulnerability is only present in Cisco IOS release trains based on 12.0S, 12.2, and 12.3. Releases based on 12.0, 12.1 mainlines, and all Cisco IOS images prior to 12.0 are not affected.
568979e1c71157314ffb20b9d5fa0db45d174f2a149e7a9a9c148d2a611e8530
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<title>Cisco Security Advisory: Cisco IOS Malformed OSPF Packet Causes Reload</TITLE>
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<h1>Cisco Security Advisory: Cisco IOS Malformed OSPF Packet Causes Reload</H1><H3>Document ID: 61365</H3>
<h2>Revision 1.0</H2>
<h3>For Public Release 2004 August 18 15:00 UTC (GMT)</H3>
<hr />
<h3>Please provide your <a href="#feedback">feedback</A> on this document.</H3>
<hr />
<h2>Contents</H2>
<blockquote>
<b>
<a href="#summary">Summary</A>
</B>
<br />
<b>
<a href="#affected">Affected Products</A>
</B>
<br />
<b>
<a href="#details">Details</A>
</B>
<br />
<b>
<a href="#impact">Impact</A>
</B>
<br />
<b>
<a href="#software">Software Versions and Fixes</A>
</B>
<br />
<b>
<a href="#fixes">Obtaining Fixed Software</A>
</B>
<br />
<b>
<a href="#workarounds">Workarounds</A>
</B>
<br />
<b>
<a href="#exploitation">Exploitation and Public Announcements</A>
</B>
<br />
<b>
<a href="#status">Status of This Notice: FINAL</A>
</B>
<br />
<b>
<a href="#distribution">Distribution</A>
</B>
<br />
<b>
<a href="#revision">Revision History</A>
</B>
<br />
<b>
<a href="#secpro">Cisco Security Procedures</A>
</B>
<br />
</BLOCKQUOTE>
<hr />
<h2>
<a name="summary">Summary</A>
</H2>
<p>A Cisco device running Internetwork Operating System (IOS) ® and
enabled for the Open Shortest Path First (OSPF) protocol is vulnerable to a
Denial of Service (DoS) attack from a malformed OSPF packet. The OSPF protocol
is not enabled by default.</P>
<p>The vulnerability is only present in Cisco IOS release trains based on
12.0S, 12.2, and 12.3. Releases based on 12.0, 12.1 mainlines, and all Cisco
IOS images prior to 12.0 are not affected.</P>
<p>Cisco has made free software available to address this
vulnerability.</P>
<p>There are workarounds available to mitigate the effects.</P>
<p>This advisory is available at
<a href="http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml">http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml</A>.</P>
<h2>
<a name="affected">Affected Products</A>
</H2>
<h3>
<a name="vps"> Vulnerable Products </A>
</H3>
<p>This vulnerability was introduced by a code change that was committed
to the 12.0S, 12.2, and 12.3 based release trains, causing these trains to be
vulnerable. All Cisco devices running a vulnerable release train and running
OSPF process are vulnerable.</P>
<p>Some release trains that are not vulnerable are explicitly listed below
for clarification. The release trains that are not mentioned below are not
vulnerable.</P>
<table bgcolor="#FFFFFF" cellpadding="3" cellspacing="1" border="1" width="60%">
<tr>
<th height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>Release Train</P>
</TH>
<th height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>Vulnerable Versions</P>
</TH>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>10.x based releases</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Not vulnerable</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>11.x based releases</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Not vulnerable</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0 based releases (except for 12.0.S based
releases)</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Not vulnerable</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.1 based releases</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Not vulnerable</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0.S</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(22)S and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0.SX</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(23)SX and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0.SY</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(22)SY and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0.SZ</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(23)SZ and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2 mainline</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Not vulnerable</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.B</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)B and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.BC</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BC and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.BX</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BX and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.BZ</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BZ and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.CX</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)CX and later </P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.EW</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)EW and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.MC</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)MC1 and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.S</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)S and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.SE</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)SE and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.SV</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)SV and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.SW</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)SW and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.SZ</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(14)SZ and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.T</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)T and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.YU</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(11)YU and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.YV</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(11)YV and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZD</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZD and later </P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZE</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZE and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZF</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZF and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZG</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZG and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZH</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZH and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZJ</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZJ and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZK</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZK and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZL</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZL and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZN</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZN and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2.ZO</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZO and later</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3 releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.B</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.B releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.BW</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.BW releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.T</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.T releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.XA</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.XA releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.XB</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.XB releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.XC</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.XC releases</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3.XE</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>All 12.3.XE releases</P>
</TD>
</TR>
</TABLE>
<p />
<p>A Cisco device which is running an OSPF process will have a line in the
configuration defining the process number, which can be seen by issuing the
<b>command show running-config</B>:</P>
<blockquote>
<pre>
<b>router ospf {process number}</B>
</PRE>
</BLOCKQUOTE>
<p>To determine the software running on a Cisco product, log in to the
device and issue the <b>show version</B> command to display
the system banner. Cisco IOS software will identify itself as "Internetwork
Operating System Software" or simply "IOS." On the next line of output, the
image name will be displayed between parentheses, followed by "Version" and the
Cisco IOS release name. Other Cisco devices will not have the <b>show
version</B> command, or will give different output.</P>
<p>The following example identifies a Cisco product running Cisco IOS
release 12.0(3) with an installed image name of C2500-IS-L:</P>
<blockquote>
<pre>
Cisco Internetwork Operating System Software IOS (TM)
2500 Software (C2500-IS-L), Version 12.0(3), RELEASE SOFTWARE</PRE>
</BLOCKQUOTE>
<p>The release train label is "12.0." The next example shows a product
running Cisco IOS release 12.0(2a)T1 with an image name of C2600-JS-MZ:</P>
<blockquote>
<pre>
Cisco Internetwork Operating System Software IOS (tm)
C2600 Software (C2600-JS-MZ), Version 12.0(2a)T1, RELEASE SOFTWARE (fc1)</PRE>
</BLOCKQUOTE>
<p>Additional information about Cisco IOS release naming can be found at
<a href="http://www.cisco.com/warp/public/620/1.html">http://www.cisco.com/warp/public/620/1.html</A>.</P>
<h3>
<a name="nonvulnerable">Products Confirmed Not Vulnerable</A>
</H3>
<ul>
<li>
Products that are not running Cisco IOS are not
affected.<br />
</LI>
<li>
Products running Cisco IOS versions 12.0 and earlier (excluding 12.0
S), 12.1 mainline and 12.2 mainline are not vulnerable.<br />
</LI>
<li>
Products running IOS release trains that are not mentioned in the
above table are not vulnerable.<br />
</LI>
<li>
Products running any version of Cisco IOS that do
<b>not</B> have OSPF configured are not
vulnerable.<br />
</LI>
</UL>
<h2>
<a name="details">Details</A>
</H2>
<p>OSPF is a routing protocol defined by RFC 2328. It is designed to
manage IP routing inside an Autonomous System (AS). OSPF packets use IP
protocol number 89.</P>
<p>A vulnerability exists in the processing of an OSPF packet that can be
exploited to cause the reload of a system. Several parameters need to be known
by an attacker to successfully exploit this vulnerability. These are the OSPF
area number, netmask, hello, and dead timers that are configured on the
targeted interface.</P>
<p>Since OSPF needs to process unicast packets as well as multicast
packets, this vulnerability can be exploited remotely. It is also possible for
an attacker to target multiple systems on the local segment at a time.</P>
<p>Using OSPF Authentication as described in the workarounds section can
be used to mitigate the effects of this vulnerability. Using OSPF
Authentication is a highly recommended security best practice</P>
<p>A Cisco device receiving a malformed OSPF packet will reset and may
take several minutes to become fully functional. This vulnerability may be
exploited repeatedly resulting in an extended DOS attack. This issue is
documented in bug ID CSCec16481.</P>
<h2>
<a name="impact">Impact</A>
</H2>
<p>Successful exploitation of this vulnerability results in a reload of
the device. Repeated exploitation could result in a sustained DoS
attack.</P>
<h2>
<a name="software">Software Versions and Fixes</A>
</H2>
<table bgcolor="#FFFFFF" cellpadding="3" cellspacing="1" border="1" width="60%">
<tr>
<th height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>Major Release </P>
</TH>
<th height="" width="" bgcolor="CCCCFF" colspan="3" rowspan="1">
<p>Availability of Repaired Releases* </P>
</TH>
</TR>
<tr>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Affected 12.0-Based Release</B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Rebuild </B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Interim**</B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Maintenance</B> </P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="9">
<p>12.0(22)S and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="2">
<p>12.0(22)S6</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="3"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(23)S5</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(24)S2c</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(24)S4</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(25)S1d</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(25)S2</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="2">
<p>12.0(26)S1</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="2">
<p>12.0(27)S</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(23)SX and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(25)SX2</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(22)SY and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.0(23)S5 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(23)SZ and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.0(27)SZ</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Affected 12.2-Based Release </B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Rebuild </B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Interim**</B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Maintenance</B>
</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)B and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(4)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="2">
<p>12.2(15)BC and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BC1c</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="2"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="2"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BC2</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BX and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(16)BX Migrate to 12.3(7)XI1 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)BZ and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(7)XI1 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)CX and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.2(15)BC2 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)EW </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)EW1</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)MC1 and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)MC2a available upon request</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)S and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)S5</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(20)S</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)SE and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(20)SE</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)SV and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(22)SV</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(18)SW and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(20)SW</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(14)SZ and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.2(20)S4 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)T and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)T8</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(11)YU and later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(4)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(11)YV and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(4)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZD and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZE and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZF and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(4)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZG and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(4)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(13)ZH and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(4)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZJ and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZK and later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZK2</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZL and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(7)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZN and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(2)T4 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.2(15)ZO and later </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.2(15)T8 or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Affected 12.3-Based Release</B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Rebuild</B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Interim**</B>
</P>
</TD>
<td height="" width="" bgcolor="CCCCFF" colspan="1" rowspan="1">
<p>
<b>Maintenance </B>
</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3 </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3(3f)</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3(5)</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3B </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3(5a)B</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3BW </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3B or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3T </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3(2)T4</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3(4)T</P>
</TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3XA </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(7)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3XB</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3(2)XB3</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3XC </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(8)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>12.3XE </P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Migrate to 12.3(8)T or later</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1"> </TD>
</TR>
</TABLE>
<p />
<h2>
<a name="fixes">Obtaining Fixed Software</A>
</H2>
<p />
<h3>
<a name="withservice">Customers with Service Contracts</A>
</H3>
<p>Customers with contracts should obtain upgraded software through their
regular update channels. For most customers, this means that upgrades should be
obtained through the Software Center on Cisco's worldwide website at
<a href="http://www.cisco.com">http://www.cisco.com</A>. </P>
<h3>
<a name="thirdparty">Customers using Third-party Support Organizations </A>
</H3>
<p>Customers whose Cisco products are provided or maintained through prior
or existing agreement with third-party support organizations such as Cisco
Partners, authorized resellers, or service providers should contact that
support organization for assistance with the upgrade, which should be free of
charge.</P>
<h3>
<a name="without">Customers without Service Contracts </A>
</H3>
<p> Customers who purchase direct from Cisco but who do not hold a Cisco
service contract and customers who purchase through third-party vendors but are
unsuccessful at obtaining fixed software through their point of sale should get
their upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC
contacts are as follows. </P>
<ul>
<li>
+1 800 553 2447 (toll free from within North America)
<br />
</LI>
<li>
+1 408 526 7209 (toll call from anywhere in the world)
<br />
</LI>
<li>
e-mail: <a href="mailto:tac@cisco.com">tac@cisco.com</A>
<br />
</LI>
</UL>
<p>Please have your product serial number available and give the URL of
this notice as evidence of your entitlement to a free upgrade. Free upgrades
for non-contract customers must be requested through the TAC. </P>
<p>Please do not contact either "psirt@cisco.com" or
"security-alert@cisco.com" for software upgrades. </P>
<h2>
<a name="workarounds">Workarounds</A>
</H2>
<p>The effectiveness of any workaround is dependent on specific customer
situations such as product mix, network topology, traffic behavior, and
organizational mission. Due to the variety of affected products and releases,
customers should consult with their service provider or support organization to
ensure any applied workaround is the most appropriate for use in the intended
network before it is deployed.</P>
<p>There are multiple workarounds available to mitigate the effects of
this vulnerability.</P>
<h3>
<a name="using">Using OSPF Authentication</A>
</H3>
<p>OSPF authentication may be used as a workaround. OSPF packets without a
valid key will not be processed. MD5 authentication is highly recommended, due
to inherent weaknesses in plain text authentication. With plain text
authentication, the authentication key will be sent unencrypted over the
network, which can allow an attacker on a local network segment to capture the
key by sniffing packets.</P>
<p>Refer to <a href="http://www.cisco.com/warp/public/104/25.shtml">http://www.cisco.com/warp/public/104/25.shtml</A>
for more information about OSPF authentication.</P>
<h3>
<a name="infrastructure">Infrastructure Access Control Lists</A>
</H3>
<p>Although it is often difficult to block traffic transiting your
network, it is possible to identify traffic which should never be allowed to
target your infrastructure devices and block that traffic at the border of your
network. Infrastructure ACLs are considered a network security best practice
and should be considered as a long-term addition to good network security as
well as a workaround for this specific vulnerability. The white paper
"Protecting Your Core: Infrastructure Protection Access Control Lists" presents
guidelines and recommended deployment techniques for infrastructure protection
ACLs: <a href="http://www.cisco.com/warp/public/707/iacl.html">http://www.cisco.com/warp/public/707/iacl.html</A>.</P>
<h2>
<a name="exploitation">Exploitation and Public Announcements</A>
</H2>
<p>The Cisco PSIRT is not aware of any public announcements or malicious
use of the vulnerability described in this advisory. </P>
<h2>
<a name="status">Status of This Notice: FINAL</A>
</H2>
<Concept>
<Para>THIS ADVISORY IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY. YOUR USE OF THE INFORMATION ON THE ADVISORY OR MATERIALS LINKED FROM THE ADVISORY IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS NOTICE AT ANY TIME.</PARA>
</CONCEPT> <h2>
<a name="distribution">Distribution</A>
</H2>
<p />
<p>This advisory will be posted on Cisco's worldwide website at
<a href="http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml">http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml</A>.
</P>
<p>In addition to worldwide web posting, a text version of this notice is
clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail
and Usenet news recipients.</P>
<ul>
<li>
cust-security-announce@cisco.com<br />
</LI>
<li>
first-teams@first.org (includes CERT/CC) <br />
</LI>
<li>
bugtraq@securityfocus.com <br />
</LI>
<li>
vulnwatch@wulnwatch.org <br />
</LI>
<li>
cisco@spot.colorado.edu <br />
</LI>
<li>
cisco-nsp@puck.nether.net <br />
</LI>
<li>
full-disclosure@lists.netsys.com<br />
</LI>
<li>
comp.dcom.sys.cisco@newsgate.cisco.com <br />
</LI>
</UL>
<p>Future updates of this advisory, if any, will be placed on Cisco's
worldwide website, but may or may not be actively announced on mailing lists or
newsgroups. Users concerned about this problem are encouraged to check the
above URL for any updates. </P>
<h2>
<a name="revision">Revision History</A>
</H2>
<table bgcolor="#FFFFFF" cellpadding="3" cellspacing="1" border="1" width="60%">
<tr>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Revision 1.0</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>2004-August-18</P>
</TD>
<td height="" width="" bgcolor="FFFFFF" colspan="1" rowspan="1">
<p>Initial public release.</P>
</TD>
</TR>
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<h2>
<a name="secpro">Cisco Security Procedures</A>
</H2>
<p>Complete information on reporting security vulnerabilities in Cisco
products, obtaining assistance with security incidents, and registering to
receive security information from Cisco, is available on Cisco's worldwide
website at
<a href="http://www.cisco.com/warp/public/707/sec_incident_response.shtml">http://www.cisco.com/warp/public/707/sec_incident_response.shtml</A>.
This includes instructions for press inquiries regarding Cisco security
notices. All Cisco security advisories are available at
<a href="http://www.cisco.com/go/psirt">http://www.cisco.com/go/psirt</A>.
</P>
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<!-- PIDLMD --><hr width=100%><table width=100%><tr><td align=left>Updated: Aug 18, 2004</TD><td align=right>Document ID: 61365</TD></TR></TABLE><hr width=100%><!-- PIDLMD -->
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