Independent researcher Luigi Auriemma has identified a denial of service (DoS) vulnerability in Certec EDV GmbH atvise application.
Certec has produced an update that resolves this vulnerability. Mr. Auriemma validated that the update resolves the vulnerability.
Atvise versions older than Version 2.1 are affected.
Successful exploitation of these vulnerabilities may allow an attacker to cause a DoS. Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
An attacker could exploit this vulnerability by sending specially crafted packets to Port 4840/TCP. CVE-2011-4873 has been assigned to this vulnerability.
This vulnerability is remotely exploitable.
EXISTENCE OF EXPLOIT
Public exploits are known to target this vulnerability.
An attacker with a low skill level can create the DoS.
Certec has developed a new version of atvise that prevents this DoS. Customers can download the new version of atvise at: http://www.atvise.com.
Certc and ICS-CERT recommend that owners of vulnerable versions of the atvise product download and install the updated version as soon as possible.
ICS-CERT also encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks:
• Minimize network exposure for all control system devices. Critical devices should not directly face the Internet.
• Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
• When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPN is only as secure as the connected devices.
The full ICS-CERT advisory can be founde here: