Threat actors are exploiting security flaws in TBK DVR and end-of-life (EoL) TP-Link Wi-Fi routers to deploy Mirai-botnet variants on compromised devices, according to findings from Fortinet FortiGuard Labs and Palo Alto Networks Unit 42.
The attack targeting TBK DVR devices has been found to exploit CVE-2024-3721 (CVSS score: 6.3), a medium-severity command injection vulnerability affecting TBK DVR-4104 and DVR-4216 digital video recording devices, to deliver a Mirai variant called Nexcorium.
“IoT devices are increasingly prime targets for large-scale attacks due to their widespread use, lack of patching, and often weak security settings,” security researcher Vincent Li said. “Threat actors continue exploiting known vulnerabilities to gain initial access and deploy malware that can persist, spread, and cause distributed denial-of-service (DDoS) attacks.”
The Nexcorium malware displays typical traits of modern IoT-focused botnets, combining vulnerability exploitation, support for multiple architectures, and various persistence methods to sustain long-term access to infected systems. Its use of known exploits, such as CVE-2017-17215, along with extensive brute-force capabilities, underscores its adaptability and efficacy in increasing its infection reach.
Read the full report here.