CVE-2022-26143: TP240PhoneHome reflection/amplification DDoS attack vector

What this post added

This post details the analysis and mitigation of a novel DDoS attack vector leveraging Mitel's TP-240 VoIP processing interface cards. It explains how misconfigured devices expose a system test facility on UDP port 10074, allowing attackers to use them as DDoS reflectors/amplifiers. The post details the attack mechanism, including a single-packet initiation capability leading to extremely high amplification ratios (up to 4,294,967,296:1), the potential for sustained attacks of up to 14 hours, and the collateral impact on voice communications. Recommended actions include network reconnaissance for remediation, vendor coordination, implementing ingress/egress source address validation, and robust DDoS defense strategies.