## 1. SUMMARY Updates are available that resolve privately reported vulnerabilities in the product versions listed as affected in this advisory. An attacker who successfully exploits these vulnerabilities could elevate privileges or gather sensitive information. ## 2. MITIGATING FACTORS Mitigating factors describe conditions and circumstances that make an attack that exploits the vulnerability difficult or less likely to succeed. Please refer to “General security recommendations” to get general guidelines how to mitigate threats on IACS. B&R can support customers with various measures to mitigate the listed vulnerabilities. Please contact APROL Support for assistance. ## 3. RECOMMENDED PRACTICES CISA recommends users take defensive measures to minimize the exploitation risk of this vulnerability. Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolate them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most recent version available. Also recognize VPN is only as secure as its connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. ## 4. CVE DESCRIPTION An Inclusion of Functionality from Untrusted Control Sphere vulnerability in the SSH server on B&R APROL <4.4-00P1 may allow an authenticated local attacker from a trusted remote server to execute malicious commands. ## 5. DESCRIPTION An Incomplete Filtering of Special Elements vulnerability in scripts using the SSH server on B&R APROL <4.4-00P5 may allow an authenticated local attacker to authenticate as another legitimate user. ## 6. CVE DESCRIPTION An improper control of generation of code ('Code Injection') vulnerability in the AprolCreateReport component of B&R APROL <4.4-00P5 may allow an unauthenticated network-based attacker to read files from the local system. An Improper Handling of Insufficient Permissions or Privileges vulnerability in scripts used in B&R APROL <4.4-00P5 may allow an authenticated local attacker to read credential information. An Allocation of Resources Without Limits or Throttling vulnerability in the operating system network configuration used in B&R APROL <4.4-00P5 may allow an unauthenticated adjacent attacker to per-form Denial-of-Service (DoS) attacks against the product. A Missing Authentication for Critical Function vulnerability in the GRUB configuration used B&R APROL <4.4-01 may allow an unauthenticated physical attacker to alter the boot configuration of the operating system. An Exposure of Sensitive System Information to an Unauthorized Control Sphere and Initialization of a Resource with an Insecure Default vulnerability in the SNMP component of B&R APROL <4.4-00P5 may allow an unauthenticated adjacent-based attacker to read and alter configuration using SNMP. An Incorrect Implementation of Authentication Algorithm and Exposure of Data Element to Wrong Session vulnerability in the session handling used in B&R APROL <4.4-00P5 may allow an authenticated network attacker to take over a currently active user session without login credentials. A Server-Side Request Forgery vulnerability in the APROL Web Portal used in B&R APROL <4.4-00P5 may allow an unauthenticated network-based attacker to force the web server to request arbitrary URLs. A Server-Side Request Forgery vulnerability in the APROL Web Portal used in B&R APROL <4.4-00P5 may allow an authenticated network-based attacker to force the web server to request arbitrary URLs An Improper Neutralization of Input During Web Page Generation vulnerability in the APROL Web Portal used in B&R APROL <4.4-00P5 may allow an authenticated network-based attacker to insert malicious code which is then executed in the context of the user’s browser session. An External Control of File Name or Path vulnerability in the APROL Web Portal used in B&R APROL <4.4-005P may allow an authenticated network-based attacker to access data from the file system. An Incorrect Permission Assignment for Critical Resource vulnerability in the file system used in B&R APROL <4.4-01 may allow an authenticated local attacker to read and alter the configuration of another engineering or runtime user. ## 7. EXTRA INFO * **General security recommendations**: For any installation of software-related B&R products we strongly recommend the following (non-exhaustive) list of cyber security practices: – Isolate special purpose networks (e.g. for automation systems) and remote devices behind firewalls and separate them from any general-purpose network (e.g. office or home networks). – Install physical controls so no unauthorized personnel can access your devices, components, peripheral equipment, and networks. – Never connect programming software or computers containing programing software to any net-work other than the network for the devices that it is intended for. – Scan all data imported into your environment before use to detect potential malware infections. – Minimize network exposure for all applications and endpoints to ensure that they are not accessible from the Internet unless they are designed for such exposure and the intended use requires such. – Ensure all nodes are always up to date in terms of installed software, operating system, and firmware patches as well as anti-virus and firewall. – When remote access is required, use secure methods, such as Virtual Private Networks (VPNs). Recognize that VPNs may have vulnerabilities and should be updated to the most current version available. Also, understand that VPNs are only as secure as the connected devices. More information on recommended practices can be found in the following documents:(Defense in Depth for B&R products) * **Notice**: The information in this document is subject to change without notice, and should not be construed as a commitment by B&R. B&R provides no warranty, express or implied, including warranties of merchantability and fitness for a particular purpose, for the information contained in this document, and assumes no responsibility for any errors that may appear in this document. In no event shall B&R or any of its suppliers be liable for direct, indirect, special, incidental or consequential damages of any nature or kind arising from the use of this document, or from the use of any hardware or software described in this document, even if B&R or its suppliers have been advised of the possibility of such damages. This document and parts hereof must not be reproduced or copied without written permission from B&R, and the contents hereof must not be imparted to a third party nor used for any unauthorized purpose. All rights to registrations and trademarks reside with their respective owners. * **Support**: For additional instructions and support please contact your local B&R service organization. For contact information, see https://www.br-automation.com/en/about-us/locations/. Information about ABB’s cyber security program and capabilities can be found at www.abb.com/cybersecurity. * **Legal Notice**: 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/.* **Advisory Conversion Disclaimer**: This CISA CSAF advisory was converted from ABB PSIRT's CSAF advisory.* **Critical infrastructure sectors**: Critical Manufacturing* **Countries/areas deployed**: Worldwide* **Company headquarters location**: Switzerland

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