CVE-2019-9228 : Security Advisory and Response

A vulnerability has been identified in AudioCodes Mediant devices running specific firmware versions, allowing remote attackers to exploit SSH and TELNET management functionalities.

Understanding CVE-2019-9228

This CVE involves a denial of service vulnerability on AudioCodes Mediant devices due to limitations in unauthenticated client configurations.

What is CVE-2019-9228?

The vulnerability in AudioCodes Mediant devices running firmware versions F7.20A or earlier allows remote attackers to exhaust connection slots through repeated unauthenticated connection attempts.

The Impact of CVE-2019-9228

Remote attackers can cause a denial of service by exploiting SSH and TELNET management functionalities.
The vulnerability stems from the limitation of unauthenticated clients to 5, enabling attackers to exhaust connection slots.

Technical Details of CVE-2019-9228

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability affects AudioCodes Mediant 500L-MSBR, 500-MBSR, M800B-MSBR, and 800C-MSBR devices.
It exists in firmware versions up to 7.20A.252.062, allowing for denial of service attacks.

Affected Systems and Versions

AudioCodes Mediant devices running firmware versions F7.20A or earlier are vulnerable.

Exploitation Mechanism

Remote attackers exploit the SSH and TELNET management functionalities by making 5 consecutive unauthenticated connection attempts.

Mitigation and Prevention

Protecting systems from CVE-2019-9228 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update firmware to versions beyond 7.20A.252.062 to mitigate the vulnerability.
Implement network segmentation to limit exposure to potential attacks.

Long-Term Security Practices

Regularly monitor and audit SSH and TELNET access to detect suspicious activities.
Train users on secure authentication practices to prevent unauthorized access.

Patching and Updates

Apply vendor-recommended patches promptly to address known vulnerabilities.