CVE-2023-38906 in Smart Bulb Tapo L530
Summary
by MITRE • 08/22/2023
An issue in TPLink Smart bulb Tapo series L530 v.1.0.0 and Tapo Application v.2.8.14 allows a remote attacker to obtain sensitive information via the authentication code for the UDP message.
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Analysis
by VulDB Data Team • 09/14/2023
The vulnerability identified as CVE-2023-38906 affects TP-Link Smart Bulb Tapo series L530 devices running firmware version 1.0.0 and the associated Tapo application version 2.8.14. This security flaw resides within the device's handling of UDP messages and exposes sensitive authentication information that could be exploited by remote attackers. The issue represents a critical weakness in the device's communication protocol implementation, specifically in how it processes and responds to UDP packets that contain authentication codes. The vulnerability allows an attacker to intercept and extract authentication credentials through improperly secured UDP message exchanges, potentially enabling unauthorized access to the device and its associated network ecosystem.
The technical root cause of this vulnerability stems from inadequate input validation and insufficient cryptographic protection mechanisms within the device's UDP communication stack. When the Tapo series L530 bulb receives UDP messages, it fails to properly sanitize or encrypt the authentication codes contained within these packets. This weakness creates an information disclosure vulnerability where sensitive authentication data becomes accessible to any attacker who can intercept the UDP traffic. The flaw is particularly concerning because UDP is a connectionless protocol that does not inherently provide authentication or encryption, making it susceptible to man-in-the-middle attacks and packet sniffing operations. According to CWE standards, this vulnerability aligns with CWE-200, which addresses information exposure, and CWE-310, which covers cryptographic issues in protocol implementation. The vulnerability's classification under CWE-200 indicates that it exposes sensitive information that could be used to compromise system security, while CWE-310 highlights the cryptographic weaknesses in the implementation.
The operational impact of this vulnerability extends beyond simple information disclosure, potentially enabling full device compromise and unauthorized network access. An attacker who successfully exploits this vulnerability could gain complete control over the affected Tapo L530 bulb, allowing them to manipulate lighting settings, potentially access other devices on the same network, and use the compromised device as a pivot point for further attacks. The exposure of authentication codes through UDP messages creates a persistent security risk that remains active as long as the device remains connected to the network. This vulnerability particularly affects IoT ecosystems where multiple devices communicate using UDP protocols, as it demonstrates how weaknesses in one device can compromise the entire network infrastructure. The attack vector is particularly dangerous because it requires minimal privileges to exploit, making it accessible to attackers with basic network reconnaissance capabilities.
Mitigation strategies for CVE-2023-38906 should prioritize immediate firmware updates from TP-Link to address the underlying UDP message handling implementation. Network administrators should implement network segmentation and access control measures to limit the potential impact of compromised devices within their environments. The implementation of network monitoring solutions capable of detecting unusual UDP traffic patterns can help identify potential exploitation attempts. Security professionals should also consider deploying network intrusion detection systems that can flag suspicious authentication code exchanges. According to ATT&CK framework, this vulnerability maps to T1046 for network service scanning and T1566 for phishing attacks, as attackers might use the compromised device to conduct further reconnaissance or establish persistent access. Organizations should also implement robust network monitoring protocols that can detect anomalous behavior in IoT device communications, particularly focusing on UDP traffic that contains authentication information. The recommended approach includes disabling unnecessary UDP services, implementing proper network access controls, and establishing regular security assessments of IoT device configurations to prevent unauthorized access through similar vulnerabilities.