CVE-2022-26143

CVE-2022-26143 is a critical-severity (CVSS 9.8) vulnerability in Mitel MiCollab, MiVoice Business Express. CISA added it to the Known Exploited Vulnerabilities catalog on March 25, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by April 15, 2022. CISA does not currently list it as used in ransomware campaigns. Mitel has 7 vulnerabilities in the KEV catalog, 5 of them linked to ransomware.

The TP-240 (aka tp240dvr) component in Mitel MiCollab before 9.4 SP1 FP1 and MiVoice Business Express through 8.1 allows remote attackers to obtain sensitive information and cause a denial of service (performance degradation and excessive outbound traffic). This was exploited in the wild in February and March 2022 for the TP240PhoneHome DDoS attack.

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

• https://arstechnica.com/information-technology/2022/03/ddosers-use-new-method-capable-of-amplifying-traffic-by-a-factor-of-4-billion/
• https://blog.cloudflare.com/cve-2022-26143/
• https://news.ycombinator.com/item?id=30614073
• https://team-cymru.com/blog/2022/03/08/record-breaking-ddos-potential-discovered-cve-2022-26143/
• https://www.akamai.com/blog/security/phone-home-ddos-attack-vector
• https://www.mitel.com/en-ca/support/security-advisories/mitel-product-security-advisory-22-0001
• https://www.shadowserver.org/news/cve-2022-26143-tp240phonehome-reflection-amplification-ddos-attack-vector/
• https://arstechnica.com/information-technology/2022/03/ddosers-use-new-method-capable-of-amplifying-traffic-by-a-factor-of-4-billion/