All information products included in https://us-cert.cisa.gov/ics are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see https://us-cert.cisa.gov/tlp/.
1. EXECUTIVE SUMMARY
- CVSS v3 9.3
- ATTENTION: Low skill level to exploit
- Vendor: PTC
- Equipment: Kepware LinkMaster
- Vulnerability: Incorrect Default Permissions
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a local attacker to globally overwrite the service configuration to execute arbitrary code with NT SYSTEM privileges.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of PTC Kepware LinkMaster, a Windows application linking data between OPC servers, are affected:
- Kepware LinkMaster Version 126.96.36.199 and prior
3.2 VULNERABILITY OVERVIEW
The affected product has incorrect default permissions, which may grant an attacker access to reconfigure the service in any manner.
- CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: United States
Yuri Kramarz of Cisco Talos reported this vulnerability to PTC.
PTC recommends users upgrade to Version 3.0.99
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.cisa.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
- Do not click web links or open unsolicited attachments in email messages.
- Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
- Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product.
Please share your thoughts.
We recently updated our anonymous product survey; we'd welcome your feedback.