Mitel Vulnerability Exploited 

THE THREAT

On March 8th, 2022, the Canadian Centre for Cyber Security (CCCS) disclosed ongoing attacks exploiting the Mitel vulnerability CVE-2022-26143 (CVSS:9.8). The vulnerability impacts the Mitel MiCollab and MiVoice Business Express products. Exploitation of CVE-2022-26143 allows remote and unauthenticated threat actors to gain initial access to victim devices, execute code, and perform Denial-of-Service (DoS) attacks.

Security patches are not available for CVE-2022-26143. Organizations using Mitel MiCollab and MiVoice Business Express are strongly encouraged to ensure devices are secured behind a firewall to minimize the likelihood of exploitation.

What we’re doing about it

• eSentire Managed Vulnerability Service (MVS) will automatically add the relevant plugins for this vulnerability once details are made available
• eSentire security teams are tracking this threat for additional details and detection opportunities

What you should do about it

• Mitel has provided a script to mitigate the vulnerability
• Organizations are recommended to review Mitel products and ensure they are deployed on internal networks or secured via a firewall
• Apply firewall rules to block specific ports to the MiVoice Business Express
• Once patches are released, organizations are recommended to perform a business impact review and apply the relevant patches
  • Mitel has not stated when security patches will be made available

Additional information

CVE-2022-26143 was initially reported in February 2022; exploitation of the vulnerability has been ongoing since at least February 18th. Attacks in the wild are reported to have been performed in order to launch large scale Distributed Denial of Service (DDoS) attacks.

It should be noted that CVE-2022-26143 has alternatively been referred to as CVE-2022-26487. These CVS designations are duplicates and CVE-2022-26487 has been depreciated.

Impacted Products:

• Mitel MiCollab – version R9.4SP1 and prior
• MiVoice Business Express – version R8.1 and prior

References:

[1] https://cyber.gc.ca/en/alerts/mitel-security-advisory-av22-123
[2] https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-26143/
[3] https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-22-0001
[4] https://mitel.custhelp.com/app/answers/answer_view/a_id/1017561 (Authentication Required)
[5] https://www.mitel.com/-/media/mitel/file/pdf/support/security-advisories/security-bulletin_22-0001-02-v1---mivbx.pdf
[6] https://blog.cloudflare.com/cve-2022-26143-amplification-attack/