CVE-2022-47848 in Vtech NB403-IL
Summary
by MITRE • 09/15/2023
An issue was discovered in Bezeq Vtech NB403-IL version BZ_2.02.07.09.13.01 and Vtech IAD604-IL versions BZ_2.02.07.09.13.01, BZ_2.02.07.09.13T, and BZ_2.02.07.09.09T, allows remote attackers to gain sensitive information via rootDesc.xml page of the UPnP service.
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Analysis
by VulDB Data Team • 10/12/2023
The vulnerability identified as CVE-2022-47848 affects telecommunications equipment manufactured by Vtech, specifically the NB403-IL and IAD604-IL series devices. These products operate with firmware versions ranging from BZ_2.02.07.09.13.01 through BZ_2.02.07.09.09T, representing a significant security gap in network infrastructure devices commonly deployed in enterprise and residential environments. The flaw resides within the Universal Plug and Play service implementation, which is a standard protocol designed to enable devices to discover and communicate with each other on networks without requiring manual configuration. This vulnerability allows unauthenticated remote attackers to access sensitive information through a specific file named rootDesc.xml, which contains metadata about the device's UPnP service configuration and potentially exposes internal network topology details.
The technical nature of this vulnerability stems from inadequate access controls and information disclosure mechanisms within the UPnP implementation of these devices. The rootDesc.xml file typically contains device identification information, service descriptions, and network configuration parameters that should remain protected from unauthorized access. When attackers can retrieve this information remotely, they gain valuable intelligence about the device's capabilities, firmware versions, and network structure. This information disclosure represents a classification under CWE-200, which deals with information exposure vulnerabilities, and more specifically aligns with CWE-540, which addresses exposure of sensitive information through the use of default configurations or insecure file access patterns. The vulnerability's remote exploitability means that attackers do not require physical access or local network presence to obtain this sensitive data, making it particularly concerning for network security.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates a foundation for more sophisticated attacks within the network infrastructure. Once attackers obtain the sensitive information from rootDesc.xml, they can map the network topology and identify potential attack vectors, including other vulnerable devices or services running on the same network segment. This intelligence gathering capability aligns with ATT&CK technique T1018, which involves discovering systems, domains, and network topology through network discovery methods. The vulnerability essentially provides attackers with a reconnaissance tool that can be used to plan more targeted attacks against the device or the broader network infrastructure. Organizations deploying these devices may find their internal network structures exposed to external threat actors, potentially enabling lateral movement or privilege escalation attacks against other systems within the same network environment.
Mitigation strategies for CVE-2022-47848 should prioritize immediate firmware updates from Vtech, as these devices are likely affected by the vulnerability due to their specific firmware versions. Network segmentation and access control measures should be implemented to limit the impact of potential exploitation, including restricting access to UPnP services and implementing firewall rules that prevent unauthorized remote access to these specific devices. Security monitoring should be enhanced to detect unusual access patterns to UPnP service endpoints, particularly focusing on repeated access attempts to rootDesc.xml files. The vulnerability highlights the importance of secure configuration management practices and adherence to security standards such as those outlined in NIST SP 800-44 for network security, which emphasizes the need for proper service configuration and access control enforcement. Organizations should also consider implementing network intrusion detection systems to identify and alert on potential exploitation attempts targeting UPnP services and similar network discovery mechanisms that may expose sensitive information to unauthorized parties.