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ets (default 10) -q quiet mode, do not print log to stdout, use with -l examples: /onesixtyone -c dicttxt 19216841 public /onesixtyone -c dicttxt -i hosts -o mylog -w 100
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Figure 3-7 SolarWinds IP Network Browser expands information available on systems running SNMP agents when provided with the correct community string The system shown here uses the default string public
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Figure 3-8 SNScan scans a range of hosts to test SNMP community strings
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The simplest way to prevent such activity is to remove or disable SNMP agents on individual machines If shutting off SNMP is not an option, at least ensure that it is properly configured with properly chosen community names (not the default public or private ) Of course, if you re using SNMP to manage your network, make sure to block access to TCP and UDP ports 161 (SNMP GET/SET) at all perimeter network access devices Finally, restrict access to SNMP agents to the appropriate management console IP address For example, Microsoft s SNMP agent can be configured to respond only to SNMP requests originating from an administrator-defined set of IP addresses Also consider using SNMP V3, detailed in RFCs 2571 2575 SNMP V3 is much more secure than V1/V2 and provides enhanced encryption and authentication mechanisms Unfortunately, V1/V2 is the most widely implemented, and many organizations are reluctant to migrate to a more secure version
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On Windows NT Family systems, you can edit the Registry to permit only approved access to the SNMP community name and to prevent Microsoft MIB information from being sent First, open regedt32 and go to HKLM\System\CurrentControlSet\Services\ SNMP\ Parameters\ValidCommunities Choose Security | Permissions and then set the permissions to permit only approved users access Next, navigate to HKLM\System\ CurrentControlSet\ Services\SNMP\Parameters\ExtensionAgents, delete the value that contains the LANManagerMIB2Agent string, and then rename the remaining entries to update the sequence For example, if the deleted value was number 1, then rename 2, 3, and so on, until the sequence begins with 1 and ends with the total number of values in the list Hopefully after reading this section you have general understanding of why allowing internal SNMP info to leak onto public networks is a definite no-no For more information on SNMP in general, search for the latest SNMP RFCs at wwwrfc-editororg
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Popularity: Simplicity: Impact: Risk Rating: 2 6 2 3
The Border Gateway Protocol (BGP) is the de facto routing protocol on the Internet and is used by routers to propagate information necessary to route IP packets to their destinations By looking at the BGP routing tables, you can determine the networks associated with a particular corporation to add to your target host matrix All networks connected to the Internet do not speak BGP, and this method may not work with your corporate network Only networks that have more than one uplink use BGP, and these are typically used by medium-to-large organizations The methodology is simple Here are the steps to perform BGP route enumeration: 1 Determine the Autonomous System Number (ASN) of the target organization 2 Execute a query on the routers to identify all networks where the AS Path terminates with the organization s ASN BGP Enumeration from the Internet The BGP protocol uses IP network addresses and ASNs exclusively The ASN is a 16-bit integer that an organization purchases from ARIN to identify itself on the network You can think of an ASN as an IP address for an organization Because you cannot execute commands on a router using a company name, the first step is to determine the ASN for an organization There are two techniques to do this, depending on what type of information you have One approach, if you have the company name, is to perform a whois search on ARIN with the ASN keyword (see Figure 3-9)
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