CVE-2018-20442 in TC7110.B
Summary
by MITRE
Technicolor TC7110.B STC8.62.02 devices allow remote attackers to discover Wi-Fi credentials via iso.3.6.1.4.1.2863.205.10.1.30.4.1.14.1.3.32 and iso.3.6.1.4.1.2863.205.10.1.30.4.2.4.1.2.32 SNMP requests.
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Analysis
by VulDB Data Team • 04/24/2020
The vulnerability identified as CVE-2018-20442 affects Technicolor TC7110.B STC8.62.02 network devices, representing a critical security flaw in the device's SNMP implementation that exposes sensitive wireless network credentials to remote attackers. This issue stems from improper access controls within the Simple Network Management Protocol configuration, allowing unauthorized entities to extract Wi-Fi authentication information through specific SNMP object identifiers. The affected device firmware version STC8.62.02 contains a configuration where certain SNMP requests can be used to retrieve the wireless network key without proper authentication mechanisms, creating a significant exposure risk for network security.
The technical flaw manifests through the specific SNMP object identifiers mentioned in the vulnerability description, namely iso.3.6.1.4.1.2863.205.10.1.30.4.1.14.1.3.32 and iso.3.6.1.4.1.2863.205.10.1.30.4.2.4.1.2.32, which correspond to Wi-Fi network configuration parameters. These identifiers are part of the Technicolor vendor-specific MIB (Management Information Base) structure and contain sensitive information about the wireless network settings including the passphrase or password used for Wi-Fi authentication. The vulnerability represents a failure in the principle of least privilege as defined by CWE-284, where insufficient access control measures allow unauthorized parties to retrieve critical system information through legitimate management protocols.
This vulnerability creates substantial operational impact for organizations relying on these devices, as remote attackers can exploit the flaw to gain unauthorized access to wireless networks without requiring physical access or prior knowledge of network credentials. The exposure of Wi-Fi credentials through SNMP queries enables attackers to establish persistent network access, potentially leading to full network compromise, data exfiltration, and lateral movement within the affected infrastructure. According to ATT&CK framework, this vulnerability maps to T1071.004 for application layer protocols and T1046 for network service scanning, as attackers can systematically query SNMP endpoints to discover network configuration details and credentials. The impact extends beyond immediate network access, as compromised wireless credentials can be used to infiltrate connected systems and potentially escalate privileges within the network environment.
Organizations should immediately implement mitigations including disabling SNMP access to unauthorized networks, configuring proper SNMP community string access controls, and restricting SNMP queries to trusted management systems only. Network segmentation and firewall rules should be implemented to prevent unauthorized SNMP access to these devices, while regular firmware updates should be applied to address the underlying vulnerability. The configuration should enforce strong authentication mechanisms and ensure that SNMP operations are restricted to authorized administrators only, aligning with security best practices outlined in NIST SP 800-125 and ISO 27001 standards for network security management. Additionally, continuous monitoring of SNMP traffic and network access logs should be implemented to detect potential exploitation attempts and maintain situational awareness of the device's security posture.