Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2404 Advisory (icsa-21-194-09) Siemens JT Utilities 15 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens JT Utilities Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-33715 CVE-2021-33714 CVE-2021-33713 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-194-09 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-194-09) Siemens JT Utilities Original release date: July 13, 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 5.5 o ATTENTION : Low attack complexity o Vendor : Siemens o Equipment : JT Utilities o Vulnerabilities : Function Call with Incorrect Variable or Reference as Argument, NULL Pointer Dereference 2. RISK EVALUATION Successful exploitation of these vulnerabilities could cause a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Siemens JT Utilities are affected: o All versions prior to v13.0.2.0 3.2 VULNERABILITY OVERVIEW 3.2.1 FUNCTION CALL WITH INCORRECT VARIABLE OR REFERENCE AS ARGUMENT CWE-688 When parsing specially crafted JT files, a hash function is called with an incorrect argument leading the application to crash. An attacker could leverage this vulnerability to cause a denial-of-service condition in the application. CVE-2021-33713 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/ C:N/I:N/A:H ). 3.2.2 NULL POINTER DEREFERENCE CWE-476 When parsing specially crafted JT files, a missing check for the validity of an iterator leads to NULL pointer dereference condition, causing the application to crash. An attacker could leverage this vulnerability to cause a denial-of-service condition in the application. CVE-2021-33714 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/ C:N/I:N/A:H ). 3.2.3 NULL POINTER DEREFERENCE CWE-476 When parsing specially crafted JT files, a race condition could cause an object to be released before being operated on, leading to NULL pointer dereference condition and causing the application to crash. An attacker could leverage this vulnerability to cause a denial-of-service condition in the application. CVE-2021-33715 has been assigned to this vulnerability. A CVSS v3 base score of 5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/ C:N/I:N/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS : Critical Manufacturing o COUNTRIES/AREAS DEPLOYED : Worldwide o COMPANY HEADQUARTERS LOCATION : Germany 3.4 RESEARCHER Siemens reported these vulnerabilities to CISA. 4. MITIGATIONS Siemens has identified the following specific mitigations and workarounds users can apply to reduce the risk: o Update to v13.0.2.0 or later version (login required) o Avoid opening untrusted files from unknown sources in JT Utilities As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens Operational Guidelines for Industrial Security , and follow the recommendations in the product manual. Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information about this issue, please see Siemens Security Advisory SSA-209268 . CISA recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. 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 these vulnerabilities. These vulnerabilities are not exploitable remotely. 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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 iQIVAwUBYO+ZNeNLKJtyKPYoAQjZXQ//TUgvoUIa3gTcSrvutVaZ6PREbkRowQ9M dwJIm1EXnI/gZC9VPobZVVzHM4qCqc+8I1/T/RAn92IwvZdR4oXV8SanRuUQ7Z9t sAHKnxSsxGVhLqA8qsyEr4uQ57b9Oi/0fo+GIF3ngR7a/PMNkmYBkQF9x7rNwOY2 Ew45wp3UhHSvP6PhcxfM5x2fGW/22xnwKb3sntJvR7ktKsgnQDx31ghgOLF7mGf5 CV/xDA7jhZHZW0M8gvFWahwLHo1dsQcVWDQ+JtwSPTqQ9+Mrm8wcos2FtBDzaCPa faky2p3JeTBKv7WOvhVLugiXPg+9jUs1bEE2T1isLnTFAnwHBdR5tOo2eQ2sSv1/ nEixX4+4FECabcwNH6H2L9o392vm4DSadcShnGl8MlbDND9Ll+f2drd0gh+aQSjc SxW9cY1f7RV8tI/zdg+UEChxgCWw3dBgOT+mErgJrLRYlLzFGEJ9Bit8zSoHl5dI ixbnDPV1nEHOJ5GUtC0XheKe6P1Wa6mhqIqOoSMmrBEThkhuhPIhEV6HlufO9MmL 9SVsElT/Tsg8Xt6koVpDKWlbyQPhaXfmt+914uBBX+X8PY4pZkPo8E1aq7P+B/KG +MppFULA80ASidEAqNjesEJ9UwXqQ3HTmAVDxrU2W1fBFes5kMXmyTIOyJbSXHRm lDNMBagEABc= =IPe+ -----END PGP SIGNATURE-----