Horizon Alert
Summary of the vulnerability and why it matters
The TP-240 component in Mitel MiCollab and MiVoice Business Express software is susceptible to a flaw that can be exploited remotely. This weakness allows unauthorized access to sensitive information and can lead to denial-of-service conditions through performance degradation and excessive outbound traffic. Exploitation of this vulnerability has been observed in the wild, contributing to significant distributed denial-of-service attacks.
- TP-240 component
- Remote information disclosure and denial of service
- Significant traffic amplification and degradation
Attack Path
How an attacker could exploit the issue
This vulnerability allows attackers to access sensitive information and disrupt services by degrading system performance and generating excessive outbound traffic. The TP-240 component within Mitel MiCollab and MiVoice Business Express is susceptible to this attack. Exploitation in early 2022 resulted in a significant distributed denial of service (DDoS) attack known as TP240PhoneHome.
- Exposed network service accessible externally.
- Attacker sends specific requests to the service.
- Service responds excessively, causing denial of service.
Live Threat
Current exploitation, exposure, and threat context
This vulnerability presents a significant risk due to its exploitability over the network and potential for severe impact. Attackers can exploit this without needing any prior access or authentication, leading to data disclosure and denial-of-service conditions. Organizations have been affected by this in the wild, highlighting the urgency of remediation.
- Likely attacker skill level: Basic
- Required access or conditions: Network access
- Business risk or urgency: High
Priority actions
Operational Fix
Recommended remediation, mitigation, and detection steps
This vulnerability impacts organizations using specific Mitel products, potentially exposing them to sensitive data leakage and denial-of-service attacks. The vulnerability was actively exploited in the wild, indicating a significant risk to affected systems. Organizations should prioritize identifying and mitigating this risk to protect their business operations and data.
- Find exposed Mitel systems.
- Reduce access to affected systems.
- Apply vendor updates and verify.
- Monitor for related activity.
