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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.1316.2 ICS Advisory (icsa-20-105-06) Siemens SIMOTICS, Desigo, APOGEE, and TALON 13 January 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMOTICS Siemens Desigo Siemens APOGEE Siemens TALON Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Overwrite Arbitrary Files -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-13939 Reference: ESB-2019.4317 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-20-105-06 Revision History: January 13 2021: Updated products affected April 15 2020: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-105-06) Siemens SIMOTICS, Desigo, APOGEE, and TALON (Update A) Original release date: January 12, 2021 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/ . 1. EXECUTIVE SUMMARY o CVSS v3 7.1 o ATTENTION: Exploitable from an adjacent network/low skill level to exploit o Vendor: Siemens o Equipment: SIMOTICS, Desigo, APOGEE, and TALON o Vulnerability: Business Logic Errors 2. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-20-105-06 Siemens SIMOTICS, Desigo, APOGEE, and TALON that was published April 14, 2020, to the ICS webpage on us-cert.cisa.gov. 3. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker to affect the availability and integrity of the device. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS Siemens reports the vulnerability affects the following products and versions: o APOGEE MEC/MBC/PXC (P2): All versions prior to 2.8.2 o APOGEE PXC Series (BACnet): All versions, 3.0 and newer o APOGEE PCX Series (P2): All versions, 2.8.2 and newer - --------- Begin Update A Part 1 of 2 --------- o Desigo PXC (Power PC): All versions, 2.3x to v6.00.327 o Desigo PXM20 (Power PC): All versions, 2.3x to v6.00.327 - --------- End Update A Part 1 of 2 --------- o Desigo PXC (Power PC): All versions, 2.3x and newer o Desigo PXM20 (Power PC): All versions, 2.3x and newer o SIMOTICS CONNECT 400: All versions prior to 0.3.0.330 o TALON TC Series (BACnet): All versions, 3.0 and newer 4.2 VULNERABILITY OVERVIEW 4.2.1 BUSINESS LOGIC ERRORS CWE-840 The affected products could allow an attacker to change the IP address of the device to an invalid value. This may allow an attacker to make device configuration changes and affect its availability. CVE-2019-13939 has been assigned to this vulnerability. A CVSS v3 base score of 7.1 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/ I:L/A:H ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 4.4 RESEARCHER Siemens reported this vulnerability to CISA. 5. MITIGATIONS Siemens recommends the following mitigations and workarounds for the following products: o Disable the DHCP client and use static IP address configuration instead (Note that the DHCP client is disabled by default on APOGEE/TALON and Desigo products). o APOGEE MEC, MBC, PXC: Use static IP address configuration. o APOGEE PXC Series, TALON TC Series, and Desigo products: If using static IP address is not possible, please contact a Siemens support office. - --------- Begin Update A Part 2 of 2 --------- o Desigo PXC (Power PC): Update to v6.00.327 (login required) o Desigo PXM20 (Power PC): Update to v6.00.327 (login required) - --------- End Update A Part 2 of 2 --------- o SIMOTICS CONNECT 400: Update to v0.3.0.330 As a general security measure Siemens strongly recommends users protect network access to affected products with appropriate mechanisms. Users are advised to follow recommended security practices in order to run the devices in a protected IT environment. Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity . For more information see Siemens Security Advisory SSA-162506 CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the 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 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. No known public exploits specifically target this vulnerability. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBX/6WhONLKJtyKPYoAQjLcxAAhzKtdZNlk6XEAt+qs89rawOo/Dkhy8g9 TG6/kjhcl3dGqmd6RPjwogMOcuE9tBTXk8i3oPxgrEcLrMJTqQdiLWYTKWmUx21N WOFtOUfXCXPJG2IqM+0XjAOCUcu0GItcc6Etp+fUbGSWu+qoApc46ASnCIzuEuV4 N6zP2Ism8MzfBxl6u1Qlwy89nwvV+yPeL7JX4TalqRjn4M4veqIWR+GDDw/cHbJr F8joPfVbPmToAfPVCuRq5qFk4MEFnIBTWS6m7iv3lYDlqxPw0mGoH0yRT0t3rUuL akDVjuf8Nvj+fyOZaZYLtp0JIQCiopeoOj0expQXpR8Hqj8iAaw/JDqng2bEU22O W49sIyVKUCzrHYHif62MN489/8n62ZitytZ89U+4/rvg32VPFH3x98UpA7ami7HA kDRW0ZmNwU+K/8GGFvzJXhk91FqbegrHAGoHnvQHFBc4/NbmJMnV5qN0P4hxK9gp r5W/+fs6cXbJd2ShRvewmAaOpCn/AWiCVHTI3FyrU2PYFRS19sWnk/qlQ5hdOiQF slE9KwUVVulYKFK8wm7P5lUaXIi5rPKRHP0UAcg4h8QnlEQ6YkXbFGe9Sv1dUCG+ xipft4dvvvTnzGjDzxIz2pBfZ3fftwpRaCO1ie6eclYayoP/q3Px4xfkUv6tEjb+ ahsaTZaPFP0= =kwBv -----END PGP SIGNATURE-----