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Just thought you all might want to know about this... Sorry about the HTML
email (I'm at work on Outlook...)
Kirt
To: William Karl (SD586249)
From: Alan Paller, Director of Research, The SANS Institute
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
SANS FLASH ALERT: Widespread SNMP Vulnerability
1:30 PM EST 12 February, 2002
Note: This is preliminary data! If you have additional information,
please send it to us at snmp@sans.org
In a few minutes wire services and other news sources will begin
breaking a story about widespread vulnerabilities in SNMP (Simple
Network Management Protocol). Exploits of the vulnerability cause
systems to fail or to be taken over. The vulnerability can be found in
more than a hundred manufacturers' systems and is very widespread -
millions of routers and other systems are involved.
As one of the SANS alumni, your leadership is needed in making sure that
all systems for which you have any responsibility are protected. To do
that, first ensure that SNMP is turned off. If you absolutely must run
SNMP, get the patch from your hardware or software vendor. They are all
working on patches right now. It also makes sense for you to filter
traffic destined for SNMP ports (assuming the system doing the filtering
is patched).
To block SNMP access, block traffic to ports 161 and 162 for tcp and
udp. In addition, if you are using Cisco, block udp for port 1993.
The problems were caused by programming errors that have been in the
SNMP implementations for a long time, but only recently discovered.
CERT/CC is taking the lead on the process of getting the vendors to get
their patches out. Additional information is posted at
http://www.cert.org/advisories/CA-2002-03.html
Two final notes.
Note 1: Turning off SNMP was one of the strong recommendations in the
Top 20 Internet Security Vulnerabilities that the FBI's NIPC and SANS
and the Federal CIO Council issued on October 1, 2001. If you didn't
take that action then, now might be a good time to correct the rest of
the top 20 as well as the SNMP problem. The Top 20 document is posted
at http://www.sans.org/top20.htm
Note 2: If you have Cisco routers (that's true for 85% of our readers)
you are going to have to patch them to fix this problem. This is a great
time to make the other fixes that will protect your Cisco routers from
an increasingly common set of increasingly bad attacks.
A great new free tool will be announced on Thursday that checks Cisco
routers, finds most problems, and provides specific guidance on fixing
each problem it finds. We've scheduled a web broadcast for Thursday
afternoon at 1 PM EST (18:00 UTC) to tell you about it and how to get
it.
Mark your calendar now and we'll supply complete data in tomorrow's
Newsbites and on the SANS web site tomorrow, as well.
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--Boundary_(ID_Na2+9bxIt9A7CCYLLZ+eYw)
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Content-transfer-encoding: quoted-printable
FW: SANS FLASH ALERT: Widespread SNMP Vulnerability
Just thought you all might want to know about this... =
Sorry about the HTML email (I'm at work on Outlook...)
Kirt
To: William Karl (SD586249)
From: Alan Paller, Director of Research, The SANS =
Institute
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
SANS FLASH ALERT: Widespread SNMP =
Vulnerability
1:30 PM EST 12 February, 2002
Note: This is preliminary data! If you have =
additional information,
please send it to us at snmp@sans.org
In a few minutes wire services and other news sources =
will begin
breaking a story about widespread vulnerabilities in =
SNMP (Simple
Network Management Protocol). Exploits of the =
vulnerability cause
systems to fail or to be taken over. The =
vulnerability can be found in
more than a hundred manufacturers' systems and is =
very widespread -
millions of routers and other systems are =
involved.
As one of the SANS alumni, your leadership is needed =
in making sure that
all systems for which you have any responsibility =
are protected. To do
that, first ensure that SNMP is turned off. If you =
absolutely must run
SNMP, get the patch from your hardware or software =
vendor. They are all
working on patches right now. It also makes sense =
for you to filter
traffic destined for SNMP ports (assuming the system =
doing the filtering
is patched).
To block SNMP access, block traffic to ports 161 and =
162 for tcp and
udp. In addition, if you are using Cisco, =
block udp for port 1993.
The problems were caused by programming errors that =
have been in the
SNMP implementations for a long time, but only =
recently discovered.
CERT/CC is taking the lead on the process of getting =
the vendors to get
their patches out. Additional information is =
posted at
http://www.cert.org/advisories/CA-2002-03.html
Two final notes.
Note 1: Turning off SNMP was one of the strong =
recommendations in the
Top 20 Internet Security Vulnerabilities that the =
FBI's NIPC and SANS
and the Federal CIO Council issued on October 1, =
2001. If you didn't
take that action then, now might be a good time to =
correct the rest of
the top 20 as well as the SNMP problem. The =
Top 20 document is posted
at http://www.sans.org/top20.htm
Note 2: If you have Cisco routers (that's true =
for 85% of our readers)
you are going to have to patch them to fix this =
problem. This is a great
time to make the other fixes that will protect your =
Cisco routers from
an increasingly common set of increasingly bad =
attacks.
A great new free tool will be announced on Thursday =
that checks Cisco
routers, finds most problems, and provides specific =
guidance on fixing
each problem it finds. We've scheduled a web =
broadcast for Thursday
afternoon at 1 PM EST (18:00 UTC) to tell you about =
it and how to get
it.
Mark your calendar now and we'll supply complete data =
in tomorrow's
Newsbites and on the SANS web site tomorrow, as =
well.
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=
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