File: 1421.txt

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Rule:

--
Sid:
1421

--
Summary:
This event is generated when an attempt is made to attack a device using
SNMP v1.

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Impact:
Varies depending on the implementation. Ranges from Denial of Service 
(DoS) to code execution.

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Detailed Information:
SNMP is a widely adopted protocol for managing IP networks, including 
individual network devices, and devices in aggregate. 

Several network devices come pre-installed with this protocol for 
management and monitoring.

A number of vulnerabilities exist in SNMP v1, including a community 
string buffer overflow, that will allow an attacker to execute arbitrary
code or shutdown the service.

--
Affected Systems:
Any implementation of the SNMP v1 protocol

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Attack Scenarios:
An attacker needs to send a specially crafted packet to UDP port 705
of a vulnerable device, causing a Denial of Service or possible 
execution of arbitrary code.

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Ease of Attack:
Simple.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action:
Disable the SNMP v1 protocol, use SNMP v2 protocol as an alternative.

Disable the use of SNMP for devices that do not need it.

Use Ingress/Egress filtering on a packet filtering firewall.

--
Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by Nawapong Nakjang (tony@ksc.net, tonie@thai.com)

--
Additional References:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0012
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0013

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