{
"document": {
"acknowledgments": [
{
"organization": "Siemens ProductCERT",
"summary": "reporting this vulnerability to CISA."
},
{
"names": [
"Daniel dos Santos",
"Jos Wetzels"
],
"organization": "Forescout Technologies",
"summary": "coordinated disclosure"
}
],
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Disclosure is not limited",
"tlp": {
"label": "WHITE",
"url": "https://us-cert.cisa.gov/tlp/"
}
},
"notes": [
{
"category": "summary",
"text": "SIMATIC WinCC OA implements client-side only authentication, when neither server-side authentication (SSA) nor Kerberos authentication is enabled. In this configuration, attackers could impersonate other users or exploit the client-server protocol without being authenticated.\n\nSiemens recommends to enable server-side authentication (SSA) or Kerberos authentication for all WinCC OA projects, as documented in the WinCC OA Security Guideline. In SIMATIC WinCC OA server-side authentication is available since V3.15 (and offered as the default configuration since V3.17). Additional information can be found at: https://cert-portal.siemens.com/productcert/news.html?id=21.",
"title": "Summary"
},
{
"category": "general",
"text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\n\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
"title": "General Recommendations"
},
{
"category": "general",
"text": "For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories",
"title": "Additional Resources"
},
{
"category": "legal_disclaimer",
"text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter \"License Terms\"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter \"Terms of Use\"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.",
"title": "Terms of Use"
},
{
"category": "legal_disclaimer",
"text": "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/.",
"title": "Legal Notice"
},
{
"category": "other",
"text": "This CISA CSAF advisory was converted from Siemens ProductCERT's CSAF advisory.",
"title": "Advisory Conversion Disclaimer"
},
{
"category": "other",
"text": "Multiple",
"title": "Critical infrastructure sectors"
},
{
"category": "other",
"text": "Worldwide",
"title": "Countries/areas deployed"
},
{
"category": "other",
"text": "Germany",
"title": "Company headquarters location"
},
{
"category": "general",
"text": "CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "Locate control system networks and remote devices behind firewalls and isolate them from business networks.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "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.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "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.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "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.",
"title": "Recommended Practices"
},
{
"category": "general",
"text": "Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.",
"title": "Recommended Practices"
}
],
"publisher": {
"category": "other",
"contact_details": "central@cisa.dhs.gov",
"name": "CISA",
"namespace": "https://www.cisa.gov/"
},
"references": [
{
"category": "self",
"summary": "SSA-111512: Client-side Authentication in SIMATIC WinCC OA - CSAF Version",
"url": "https://cert-portal.siemens.com/productcert/csaf/ssa-111512.json"
},
{
"category": "self",
"summary": "SSA-111512: Client-side Authentication in SIMATIC WinCC OA - TXT Version",
"url": "https://cert-portal.siemens.com/productcert/txt/ssa-111512.txt"
},
{
"category": "self",
"summary": "SSA-111512: Client-side Authentication in SIMATIC WinCC OA - PDF Version",
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-111512.pdf"
},
{
"category": "self",
"summary": "ICS Advisory ICSA-22-172-06 JSON",
"url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2022/icsa-22-172-06.json"
},
{
"category": "self",
"summary": "ICS Advisory ICSA-22-172-06 - Web Version",
"url": "https://www.cisa.gov/news-events/ics-advisories/icsa-22-172-06"
},
{
"category": "external",
"summary": "Recommended Practices",
"url": "https://www.cisa.gov/uscert/ics/alerts/ICS-ALERT-10-301-01"
},
{
"category": "external",
"summary": "Recommended Practices",
"url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
},
{
"category": "external",
"summary": "Recommended Practices",
"url": "https://www.cisa.gov/topics/industrial-control-systems"
},
{
"category": "external",
"summary": "Recommended Practices",
"url": "https://us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf"
},
{
"category": "external",
"summary": "Recommended Practices",
"url": "https://www.cisa.gov/sites/default/files/publications/Cybersecurity_Best_Practices_for_Industrial_Control_Systems.pdf"
},
{
"category": "external",
"summary": "Recommended Practices",
"url": "https://www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B"
}
],
"title": "Siemens WinCC OA",
"tracking": {
"current_release_date": "2022-06-21T00:00:00.000000Z",
"generator": {
"engine": {
"name": "CISA CSAF Generator",
"version": "1.0.0"
}
},
"id": "ICSA-22-172-06",
"initial_release_date": "2022-06-21T00:00:00.000000Z",
"revision_history": [
{
"date": "2022-06-21T00:00:00.000000Z",
"legacy_version": "1.0",
"number": "1",
"summary": "Publication Date"
}
],
"status": "final",
"version": "1"
}
},
"product_tree": {
"branches": [
{
"branches": [
{
"branches": [
{
"category": "product_version_range",
"name": "All_versions_in_default_configuration",
"product": {
"name": "SIMATIC WinCC OA V3.16",
"product_id": "CSAFPID-0001"
}
}
],
"category": "product_name",
"name": "SIMATIC WinCC OA V3.16"
},
{
"branches": [
{
"category": "product_version_range",
"name": "All_versions_in_non-default_configuration",
"product": {
"name": "SIMATIC WinCC OA V3.17",
"product_id": "CSAFPID-0002"
}
}
],
"category": "product_name",
"name": "SIMATIC WinCC OA V3.17"
},
{
"branches": [
{
"category": "product_version_range",
"name": "All_versions_in_non-default_configuration",
"product": {
"name": "SIMATIC WinCC OA V3.18",
"product_id": "CSAFPID-0003"
}
}
],
"category": "product_name",
"name": "SIMATIC WinCC OA V3.18"
}
],
"category": "vendor",
"name": "Siemens"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2022-33139",
"cwe": {
"id": "CWE-603",
"name": "Use of Client-Side Authentication"
},
"notes": [
{
"category": "summary",
"text": "Affected applications use client-side only authentication, when neither server-side authentication (SSA) nor Kerberos authentication is enabled.\n\nIn this configuration, attackers could impersonate other users or exploit the client-server protocol without being authenticated.",
"title": "Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003"
]
},
"references": [
{
"summary": "CVE-2022-33139 - SIMATIC WinCC OA V3.16",
"url": "https://www.winccoa.com/downloads/detail/security-guideline-wincc-oa-v316-1.html"
},
{
"summary": "CVE-2022-33139 - SIMATIC WinCC OA V3.17",
"url": "https://www.winccoa.com/downloads/detail/security-guideline-wincc-oa-v317.html"
},
{
"summary": "CVE-2022-33139 - SIMATIC WinCC OA V3.18",
"url": "https://www.winccoa.com/downloads/detail/security-guideline-wincc-oa-v318.html"
},
{
"summary": "CVE-2022-33139 Mitre 5.0 json",
"url": "https://cert-portal.siemens.com/productcert/mitre/CVE-2022-33139.json"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "Enable server-side authentication (SSA) or Kerberos authentication for your WinCC OA project",
"product_ids": [
"CSAFPID-0001"
],
"url": "https://www.winccoa.com/downloads/detail/security-guideline-wincc-oa-v316-1.html"
},
{
"category": "vendor_fix",
"details": "Ensure that server-side authentication (SSA) is enabled for your WinCC OA project (which is the default configuration); alternatively enable Kerberos authentication",
"product_ids": [
"CSAFPID-0002"
],
"url": "https://www.winccoa.com/downloads/detail/security-guideline-wincc-oa-v317.html"
},
{
"category": "vendor_fix",
"details": "Ensure that server-side authentication (SSA) is enabled for your WinCC OA project (which is the default configuration); alternatively enable Kerberos authentication",
"product_ids": [
"CSAFPID-0003"
],
"url": "https://www.winccoa.com/downloads/detail/security-guideline-wincc-oa-v318.html"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C",
"version": "3.1"
},
"products": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003"
]
}
],
"title": "CVE-2022-33139"
}
]
}