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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4032 Advisory (icsa-22-223-07) Siemens SCALANCE 12 August 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SCALANCE Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-36325 CVE-2022-36324 CVE-2022-36323 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-223-07 Comment: CVSS (Max): 9.1 CVE-2022-36323 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-223-07) Siemens SCALANCE Original release date: August 11, 2022 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 9.1 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Siemens o Equipment: SCALANCE o Vulnerabilities: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection'), Allocation of Resources Without Limits or Throttling, Basic Cross Site Scripting 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow attackers to execute custom code through a cross site scripting attack or allow the unauthenticated attackers to create a denial-of-service situation. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Siemens reports these vulnerabilities affects the following SCALANCE products: o M-800 / S615: All versions o SC-600 Family: All versions prior to V2.3.1 o W-700 IEEE 802.11ax Family: All versions o W-700 IEEE 802.11n Family: All versions o W-1700 IEEE 802.11ac Family: All versions o XB-200 Switch Family: All versions o XC-200 Switch Family: All versions o XF-200BA Switch Family: All versions o XM-400 Family: All versions o XP-200 Switch Family: All versions o XR-300WG Switch Family: All versions o XR-500 Family: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS IN OUTPUT USED BY A DOWNSTREAM COMPONENT ('INJECTION') CWE-74 Affected devices do not properly sanitize an input field. This could allow an authenticated remote attacker with administrative privileges to inject code or spawn a system root shell. CVE-2022-36323 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:C/C:H/ I:H/A:H ). 3.2.2 ALLOCATION OF RESOURCES WITHOUT LIMITS OR THROTTLING CWE-770 Affected devices do not properly handle the renegotiation of SSL/TLS parameters. This could allow an unauthenticated remote attacker to bypass the TCP brute force prevention and lead to a denial-of-service condition for the duration of the attack. CVE-2022-36324 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/C:N/ I:N/A:H ). 3.2.3 IMPROPER NEUTRALIZATION OF SCRIPT-RELATED HTML TAGS IN A WEB PAGE (BASIC XXS) CWE-80 Affected devices do not properly sanitize data introduced by a user when rendering the web interface. This could allow an authenticated remote attacker with administrative privileges to inject code and lead to a DOM-based XSS. CVE-2022-36325 has been assigned to this vulnerability. A CVSS v3 base score of 6.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:R/S:U/C:H/ I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Siemens has reported these vulnerabilities to CISA. 4. MITIGATIONS Siemens has provided a software patch for the following vulnerable product: o SC-600 Family: Update to v2.3.2 or later. o Siemens has identified the following specific workarounds and mitigations to reduce the risk: o Apply the principle of least privileges for accounts configured on the affected devices o Restrict network access in affected systems to ports 80/TCP and 443/TCP to trusted IP addresses and personal only. As a general security measure, Siemens strongly recommends protecting 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 the Siemens operational guidelines for industrial security and follow the recommendations in the product manuals. For additional information, please refer to Siemens Security Advisory SSA-710008 . CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open attachments in unsolicited 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 also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov/ics 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 cisa.gov/ics 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. 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: https://auscert.org.au/gpg-key/ iQIVAwUBYvW2ickNZI30y1K9AQi89g/+Ja3T35g5dwLGlSFk5keaqqPYHZQp7fW9 U9Omg5jdiRRRfbfpPpmuHYI1hXHkmlMsnYndRm66N81nYxmxpi7nnJ3CGAT+oHGk bJtgfTSnMnU2aoKNVnpd4nPzuuBuEgh6JnJy9zq28f0NtyITFjPpuV3A7AinqAAN 6ehwz1B59RByzHa87FtkLehjHyOUgsvWjeApZti/h1CKyrqDkfYLxA/Nz39hX+tR qay9uQ/2d6BYeEWSbFo25RWl5lYqz2RsSrsZPeVMhDwBa+/FEJSnWzrxKGvAsvUO +up740+ZAK9yJZtC5L6PQe5JKbq6HBugCL2cmOP9kXJF/ta0wNcw6+khyYZkGcpw 83eT2PuQks8RMcEK3NgsUnqer7l2MANJwy5NBFtTY8m/x1B0k5MIx9KREm8L74vP PIMvOf3Zv/TVkQO4fCNnEYIUpqU26Eqgiz7ufWgTyxTeqxfi/r5kFWaLYvjrTpXF K+hxvcoZfoNl9vLpmGhdJ18rItB7X9nkBEuFpZzJvOLN4ReOctaFB8lpwPxaTUd0 PHxLHVCN051E3Wychm/pzJlGmxkNxE2FHMOO7XpbkNeWF+BYUnzu2Fj3FfJkynxh +oqLmTuBdbJPviN914iwSQ4wuV5JAF42AI7ROq8KyKQS73726CPEzVhRLucrx+NG xhlNXP6dh7s= =EWUY -----END PGP SIGNATURE-----