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GEN:SID | 1:1892 |
Message | SNMP null community string attempt |
Summary | This event is generated when SNMP communications contain a NULL value the authentication string. |
Impact | Medium to Serious. Depending on if the community string was for read-only, read-create or read-write an attacker could gain a varying level of access to a system. |
Detailed Information | An SNMP community string is the authentication process that a host running SNMP uses to grant access. |
Affected Systems | Numerous. Routers, switches, servers, NAS systems, many others. |
Attack Scenarios | An attacker can launch a scan of all network attached devices looking for port 161 (UDP) and then attempt to gain access using SNMP. |
Ease of Attack | Simple. There are many free SNMP "tree walking" programs, an example of such is getIF. |
Corrective Action | Make sure that all devices that have SNMP turned on have complex passwords assigned. Disable unneeded WRITE / CREATE community strings. Since SNMP traffic is not encrypted, use a packet filtering firewall to restrict SNMP communications to the protected network. |
Additional References | GetIF: http://www.wtcs.org/snmp4tpc/getif.htm CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-1999-0517 |
Rule References | bugtraq: 2112 bugtraq: 8974 cve: 1999-0517 |
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DID:204676
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