CVE-2024-34219 in CP450
Summary
by MITRE • 05/14/2024
TOTOLINK CP450 V4.1.0cu.747_B20191224 was discovered to contain a vulnerability in the SetTelnetCfg function, which allows attackers to log in through telnet.
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Analysis
by VulDB Data Team • 08/09/2024
The vulnerability identified as CVE-2024-34219 affects the TOTOLINK CP450 router model running firmware version V4.1.0cu.747_B20191224 and represents a critical security flaw in the device's remote access configuration. This issue resides within the SetTelnetCfg function, which controls telnet service settings on the network device. The flaw enables unauthorized remote attackers to establish telnet connections to the device without proper authentication, effectively providing them with administrative access to the router's command-line interface. Such unauthenticated access represents a fundamental breach in the device's security architecture and creates a significant attack surface for malicious actors.
The technical nature of this vulnerability aligns with CWE-284, which addresses improper access control mechanisms, and specifically manifests as a weakness in privilege management and authentication controls. The SetTelnetCfg function appears to fail to properly validate incoming requests or enforce authentication requirements, allowing attackers to bypass normal login procedures. This flaw operates at the application layer of the network stack, specifically targeting the device management interface where telnet services are configured. The vulnerability's exploitation requires minimal technical expertise, as it essentially allows attackers to directly invoke the telnet configuration function without proper authorization checks, making it particularly dangerous for widespread deployment.
The operational impact of CVE-2024-34219 extends beyond simple unauthorized access, as it provides attackers with complete control over the affected router's network configuration. Once authenticated through telnet, malicious actors can modify routing tables, alter firewall rules, redirect traffic, and potentially establish persistent backdoors within the network infrastructure. This vulnerability particularly affects enterprise and residential networks where TOTOLINK CP450 devices are deployed, as it allows attackers to gain a foothold within the network perimeter and potentially escalate privileges to compromise additional connected devices. The attack vector for this vulnerability typically involves remote exploitation without requiring any credentials, making it especially concerning for devices that remain accessible on public networks.
Security professionals should consider this vulnerability in the context of the MITRE ATT&CK framework, specifically mapping it to techniques involving remote service access and privilege escalation. The vulnerability enables initial access through network services and can facilitate subsequent lateral movement within compromised networks. Organizations should implement immediate mitigations including disabling telnet services where possible, applying firmware updates from TOTOLINK, and implementing network segmentation to limit the potential impact of exploitation. Additionally, monitoring network traffic for unauthorized telnet connections and implementing robust network access controls can help detect and prevent exploitation attempts. The vulnerability demonstrates the critical importance of proper authentication mechanisms and access control implementation in network infrastructure devices, as it represents a failure in fundamental security design principles that should be enforced at all levels of network device configuration.