CVE-2018-18960 in WorkForce WF-2861
Summary
by MITRE
An issue was discovered on Epson WorkForce WF-2861 10.48 LQ22I3, 10.51.LQ20I6 and 10.52.LQ17IA devices. They use SNMP to find certain devices on the network, but the default version is v2c, allowing an amplification attack.
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Analysis
by VulDB Data Team • 04/24/2020
The vulnerability identified in Epson WorkForce WF-2861 devices represents a significant network security risk that stems from improper SNMP configuration within the device firmware. These specific models utilize SNMP version 2c as their default setting, which creates an exploitable condition that allows attackers to leverage the protocol for amplification attacks against target networks. The issue affects multiple firmware versions including 10.48 LQ22I3, 10.51.LQ20I6, and 10.52.LQ17IA, indicating a widespread problem across the product line that requires immediate attention from network administrators and security teams.
The technical flaw manifests through the use of SNMP version 2c which lacks proper authentication mechanisms and is inherently vulnerable to exploitation. When devices are configured to use SNMP version 2c, they become susceptible to SNMP amplification attacks where attackers can send requests to SNMP-enabled devices with spoofed source IP addresses, causing the devices to respond with significantly larger packets to the victim. This creates a massive network traffic amplification effect that can overwhelm target systems and result in denial-of-service conditions. The vulnerability is classified under CWE-200, which deals with information exposure, as the improper SNMP configuration exposes network infrastructure to unauthorized access and potential exploitation.
The operational impact of this vulnerability extends beyond simple network disruption to encompass broader security implications for organizations using these devices. Network administrators face the challenge of managing potentially compromised devices that could serve as entry points for more sophisticated attacks or be used as part of botnet operations. The amplification attack capability means that even a small number of compromised devices could generate massive amounts of network traffic, potentially affecting network performance, availability, and overall security posture. Organizations may experience network congestion, service degradation, and increased monitoring overhead as they attempt to identify and mitigate the effects of these attacks.
Mitigation strategies for this vulnerability should focus on immediate configuration changes and ongoing network monitoring practices. The primary recommendation involves changing the SNMP configuration from version 2c to version 3, which provides proper authentication and encryption mechanisms. Network administrators should also implement SNMP access control lists to restrict which IP addresses can query the devices and consider disabling SNMP entirely if it is not required for network management operations. Additional protective measures include implementing network segmentation to isolate these devices from critical infrastructure, deploying intrusion detection systems to monitor for suspicious SNMP traffic patterns, and regularly updating device firmware to address known vulnerabilities. This vulnerability aligns with ATT&CK technique T1071.004 which covers application layer protocol: DNS, and represents a classic example of how default insecure configurations can create widespread security risks across network infrastructure.