CVE-2018-20441 in TC7200.TH2v2
Summary
by MITRE
Technicolor TC7200.TH2v2 SC05.00.22 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-2018-20441 affects Technicolor TC7200.TH2v2 SC05.00.22 devices, representing a critical security flaw in network infrastructure equipment that enables unauthorized remote access to sensitive wireless network information. This issue stems from improper access control mechanisms within the Simple Network Management Protocol implementation of the affected devices, specifically exposing Wi-Fi credentials through structured query mechanisms that should remain protected. The vulnerability manifests through specific SNMP object identifiers that, when accessed by remote attackers, reveal confidential authentication data necessary for wireless network access.
The technical exploitation of this vulnerability occurs through the manipulation of SNMP requests targeting specific Object Identifiers within the device's management interface. The affected OID structure 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 allows attackers to retrieve Wi-Fi network credentials without proper authentication or authorization. This represents a significant flaw in the device's security architecture where sensitive configuration data is exposed through standard management protocols that should enforce strict access controls. The vulnerability falls under CWE-284 Access Control Issues, specifically demonstrating inadequate permissions controls that permit unauthorized data disclosure.
From an operational standpoint, this vulnerability creates substantial risk for organizations relying on Technicolor TC7200 devices for network infrastructure management. Remote attackers can exploit this flaw to gain immediate access to wireless network credentials, potentially enabling them to compromise entire wireless networks and establish persistent access points. The impact extends beyond simple credential theft, as these devices often serve as central management points for multiple network segments, making the compromise of one device potentially catastrophic for overall network security. This vulnerability aligns with ATT&CK technique T1071.004 Application Layer Protocol: DNS, where attackers can leverage exposed network management protocols to maintain access and escalate privileges.
The mitigation strategies for this vulnerability should include immediate implementation of SNMP access control measures, specifically restricting SNMP community string access to authorized management stations only. Network administrators should disable unnecessary SNMP services and implement proper firewall rules to limit access to SNMP ports from trusted networks only. Device firmware updates from Technicolor should be applied immediately to address the underlying access control flaws. Additionally, network segmentation should be implemented to isolate management interfaces from general network traffic, reducing the attack surface for such exploits. Regular security audits should verify that SNMP configurations do not expose sensitive information and that proper access controls are maintained throughout the network infrastructure.