Data from Configuration Repository: SNMP (MIB Dump)
Adversaries may target the Management Information Base (MIB) to collect and/or mine valuable information in a network managed using Simple Network Management Protocol (SNMP).
The MIB is a configuration repository that stores variable information accessible via SNMP in the form of object identifiers (OID). Each OID identifies a variable that can be read or set and permits active management tasks, such as configuration changes, through remote modification of these variables. SNMP can give administrators great insight in their systems, such as, system information, description of hardware, physical location, and software packages. The MIB may also contain device operational information, including running configuration, routing table, and interface details.
Adversaries may use SNMP queries to collect MIB content directly from SNMP-managed devices in order to collect network information that allows the adversary to build network maps and facilitate future targeted exploitation.
|Encrypt Sensitive Information||
Configure SNMPv3 to use the highest level of security (authPriv) available.
|Filter Network Traffic||
Apply extended ACLs to block unauthorized protocols outside the trusted network.
|Network Intrusion Prevention||
Configure intrusion prevention devices to detect SNMP queries and commands from unauthorized sources.
Segregate SNMP traffic on a separate management network.
Allowlist MIB objects and implement SNMP views.
Keep system images and software updated and migrate to SNMPv3.
Identify network traffic sent or received by untrusted hosts or networks that expose MIB content or use unauthorized protocols.
- Michael Stump. (2003). Information Security Reading Room Securing SNMP: A Look atNet-SNMP (SNMPv3). Retrieved October 19, 2020.
- US-CERT. (2018, April 20). Alert (TA18-106A) Russian State-Sponsored Cyber Actors Targeting Network Infrastructure Devices. Retrieved October 19, 2020.
- Omar Santos. (2020, October 19). Attackers Continue to Target Legacy Devices. Retrieved October 20, 2020.
- US-CERT. (2017, June 5). Reducing the Risk of SNMP Abuse. Retrieved October 19, 2020.
- Cisco. (2006, May 10). Securing Simple Network Management Protocol. Retrieved October 19, 2020.
- Cisco. (2008, June 10). Identifying and Mitigating Exploitation of the SNMP Version 3 Authentication Vulnerabilities. Retrieved October 19, 2020.