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Rule:
--
Sid:
1411
--
Summary:
This event is generated when an SNMP connection over UDP using the
default 'public' community is made.
--
Impact:
Information gathering
--
Detailed Information:
SNMP (Simple Network Management Protocol) v1 uses communities and IP
addresses to authenticate communication between the SNMP client and SNMP
daemon. Many SNMP implementations come pre-configured with 'public' and
'public' communities. If these are not disabled, the attacker can
gather a great deal of information about the device running the SNMP
daemon.
--
Affected Systems:
Devices running SNMP daemons with 'public' community enabled.
--
Attack Scenarios:
An attacker scans a range of IPs for SNMP servers having the 'public'
community set and gathers information about the hosts.
--
Ease of Attack:
Simple.
--
False Positives:
None known.
--
False Negatives:
None known.
--
Corrective Action:
Disable the 'public' and 'private' communities before connecting the
device with SNMP on the Internet or block access to SNMP ports using a
packet filtering firewall for unauthorized addresses.
--
Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by Chaos <c@aufbix.org>
--
Additional References:
CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0013
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0012
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0517
--
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