CVE-2020-5364 in Isilon OneFS
Summary
by MITRE
Dell EMC Isilon OneFS versions 8.2.2 and earlier contain an SNMPv2 vulnerability. The SNMPv2 services is enabled, by default, with a pre-configured community string. This community string allows read-only access to many aspects of the Isilon cluster, some of which are considered sensitive and can foster additional access.
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Analysis
by VulDB Data Team • 10/18/2020
The vulnerability identified as CVE-2020-5364 affects Dell EMC Isilon OneFS storage systems running versions 8.2.2 and earlier, representing a critical security weakness in the Simple Network Management Protocol version 2 implementation. This flaw stems from the default configuration of SNMPv2 services which remain active without proper authentication mechanisms, creating an attack surface that adversaries can exploit to gain unauthorized access to sensitive system information. The vulnerability is particularly concerning because it leverages a pre-configured community string that provides read-only access to numerous aspects of the Isilon cluster infrastructure, effectively bypassing normal security controls that would typically restrict such access.
The technical implementation of this vulnerability involves the SNMPv2 protocol's inherent design flaws where default community strings are hardcoded and widely known within security communities, creating a persistent risk vector for systems that do not properly configure or disable these services. The pre-configured community string serves as a default credential that allows attackers to enumerate system information including cluster status, configuration details, and potentially sensitive operational data that could be used for further exploitation. This weakness aligns with CWE-798, which specifically addresses the use of hard-coded credentials, and represents a classic case of insufficient privilege management where default administrative access is left enabled without proper security hardening.
The operational impact of this vulnerability extends beyond simple information disclosure, as the read-only access to sensitive cluster information can facilitate more sophisticated attacks including reconnaissance for privilege escalation, network mapping, and identification of additional system vulnerabilities. Attackers can leverage this access to understand the Isilon cluster topology, identify potential weak points in the storage infrastructure, and plan more targeted attacks against other systems within the network. The vulnerability creates a persistent threat vector that can be exploited by both external attackers and malicious insiders who may have network access to the Isilon cluster, making it particularly dangerous in enterprise environments where storage systems often contain critical business data.
Organizations affected by this vulnerability should immediately implement mitigations including disabling SNMPv2 services when not required, implementing proper network segmentation to restrict access to SNMP ports, and configuring strong, unique community strings if SNMP access is necessary. The recommended approach aligns with ATT&CK technique T1046 which involves discovery of network services, and emphasizes the importance of network security controls to prevent unauthorized access to management interfaces. Additionally, system administrators should conduct comprehensive security audits to identify all instances of SNMPv2 services running on their networks and ensure that proper access controls are implemented through firewall rules and network access control lists. Regular security assessments and vulnerability scanning should be performed to detect any instances of this vulnerability and ensure that proper remediation measures are in place to protect against potential exploitation attempts.