CVE-2022-29855 : What You Need to Know

A vulnerability in Mitel 6800 and 6900 Series SIP phone devices allows an unauthenticated attacker with physical access to gain root access. This CVE affects versions 5.1 SP8 (5.1.0.8016) and earlier, and 6.0 (6.0.0.368) through 6.1 HF4 (6.1.0.165).

Understanding CVE-2022-29855

This CVE impacts Mitel 6800 and 6900 Series SIP phones due to insufficient access control for test functionality during system startup.

What is CVE-2022-29855?

Mitel 6800 and 6900 Series SIP phone devices through 2022-04-27 have undocumented functionality, allowing unauthorized access to root privileges.

The Impact of CVE-2022-29855

An attacker with physical access could exploit this vulnerability to gain root access, potentially leading to sensitive information exposure and code execution.

Technical Details of CVE-2022-29855

Vulnerability Description

The vulnerability arises from insufficient access control for test functionality during system startup on Mitel 6800 and 6900 Series SIP phones.

Affected Systems and Versions

Mitel 6800 Series and 6900 Series SIP phones excluding 6970, versions 5.1 SP8 (5.1.0.8016) and earlier, and 6.0 (6.0.0.368) through 6.1 HF4 (6.1.0.165) are affected.

Exploitation Mechanism

Unauthorized physical access to the phone allows an attacker to exploit the insufficient access control, gaining root access.

Mitigation and Prevention

This section focuses on steps to mitigate the risks posed by CVE-2022-29855.

Immediate Steps to Take

It is recommended to restrict physical access to Mitel 6800 and 6900 Series SIP phones and apply security patches.

Long-Term Security Practices

Regularly monitor for security advisories from Mitel and implement best security practices to prevent unauthorized access.

Patching and Updates

Ensure that all affected Mitel 6800 and 6900 Series SIP phones are updated with the latest firmware and security patches.