ICSA-21-131-03
Vulnerability from csaf_cisa
Published
2021-05-11 00:00
Modified
2023-03-14 00:00
Summary
Siemens Linux-based Products (Update J)
Notes
Summary
A vulnerability made public under the name SAD DNS affects Domain Name
System resolvers due to a vulnerability in the Linux kernel when
handling ICMP packets. The Siemens products which are affected
are listed below. For more information please see
https://www.saddns.net/.
Siemens has released updates for the affected products and recommends to update to the latest versions.
General Recommendations
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.
Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
Additional Resources
For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use
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.
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 Siemens ProductCERT's CSAF advisory.
Critical infrastructure sectors
Multiple
Countries/areas deployed
Worldwide
Company headquarters location
Germany
Recommended Practices
CISA recommends users take defensive measures to minimize the exploitation risk of these vulnerabilities.
Recommended Practices
Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the internet.
Recommended Practices
Locate control system networks and remote devices behind firewalls and isolate them from business networks.
Recommended Practices
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.
Recommended Practices
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
Recommended Practices
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.
Recommended Practices
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.
Recommended Practices
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
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{
"category": "summary",
"text": "A vulnerability made public under the name SAD DNS affects Domain Name \nSystem resolvers due to a vulnerability in the Linux kernel when \nhandling ICMP packets. The Siemens products which are affected\nare listed below. For more information please see \nhttps://www.saddns.net/.\nSiemens has released updates for the affected products and recommends to update to the latest versions.",
"title": "Summary"
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"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\u0027 operational guidelines for Industrial Security (Download: \nhttps://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
"title": "General Recommendations"
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"text": "Siemens Security Advisories are subject to the terms and conditions contained in Siemens\u0027 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\u0027 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.",
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{
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"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"
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{
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"title": "Recommended Practices"
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{
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"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.",
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{
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},
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"summary": "SSA-324955: SAD DNS Attack in Linux Based Products - CSAF Version",
"url": "https://cert-portal.siemens.com/productcert/csaf/ssa-324955.json"
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{
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"name": "\u003cV3.1",
"product": {
"name": "SIMATIC MV560 X (6GF3560-0HE10)",
"product_id": "CSAFPID-0023",
"product_identification_helper": {
"model_numbers": [
"6GF3560-0HE10"
]
}
}
}
],
"category": "product_name",
"name": "SIMATIC MV560 X (6GF3560-0HE10)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003cV3.0_SP1",
"product": {
"name": "SINEMA Remote Connect Server",
"product_id": "CSAFPID-0024"
}
}
],
"category": "product_name",
"name": "SINEMA Remote Connect Server"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=V2.0_\u003cV2.2.28",
"product": {
"name": "SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)",
"product_id": "CSAFPID-0025",
"product_identification_helper": {
"model_numbers": [
"6AG2542-6VX00-4XE0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS ET 200SP CP 1542SP-1 IRC TX RAIL (6AG2542-6VX00-4XE0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=V2.0_\u003cV2.2.28",
"product": {
"name": "SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)",
"product_id": "CSAFPID-0026",
"product_identification_helper": {
"model_numbers": [
"6AG1543-6WX00-7XE0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS ET 200SP CP 1543SP-1 ISEC (6AG1543-6WX00-7XE0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=V2.0_\u003cV2.2.28",
"product": {
"name": "SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)",
"product_id": "CSAFPID-0027",
"product_identification_helper": {
"model_numbers": [
"6AG2543-6WX00-4XE0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS ET 200SP CP 1543SP-1 ISEC TX RAIL (6AG2543-6WX00-4XE0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=V3.1.39_\u003cV3.3",
"product": {
"name": "SIPLUS NET CP 1242-7 V2 (6AG1242-7KX31-7XE0)",
"product_id": "CSAFPID-0028",
"product_identification_helper": {
"model_numbers": [
"6AG1242-7KX31-7XE0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS NET CP 1242-7 V2 (6AG1242-7KX31-7XE0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=V3.1.39_and_\u003cV3.3.46",
"product": {
"name": "SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0)",
"product_id": "CSAFPID-0029",
"product_identification_helper": {
"model_numbers": [
"6AG1243-1BX30-2AX0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS S7-1200 CP 1243-1 (6AG1243-1BX30-2AX0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003e=V3.1.39_and_\u003cV3.3.46",
"product": {
"name": "SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0)",
"product_id": "CSAFPID-0030",
"product_identification_helper": {
"model_numbers": [
"6AG2243-1BX30-1XE0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS S7-1200 CP 1243-1 RAIL (6AG2243-1BX30-1XE0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003cV2.2_Update_1",
"product": {
"name": "SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0)",
"product_id": "CSAFPID-0031",
"product_identification_helper": {
"model_numbers": [
"6AG1543-1MX00-7XE0"
]
}
}
}
],
"category": "product_name",
"name": "SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0)"
},
{
"branches": [
{
"category": "product_version_range",
"name": "\u003cV2.2_Update_1",
"product": {
"name": "TIM 1531 IRC (6GK7543-1MX00-0XE0)",
"product_id": "CSAFPID-0032",
"product_identification_helper": {
"model_numbers": [
"6GK7543-1MX00-0XE0"
]
}
}
}
],
"category": "product_name",
"name": "TIM 1531 IRC (6GK7543-1MX00-0XE0)"
}
],
"category": "vendor",
"name": "Siemens"
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2020-25705",
"cwe": {
"id": "CWE-330",
"name": "Use of Insufficiently Random Values"
},
"notes": [
{
"category": "summary",
"text": "A flaw in ICMP packets in the Linux kernel was found to allow to quickly scan open UDP ports. This flaw allows an off-path remote user to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well. Kernel versions before 5.10 may be vulnerable to this issue.",
"title": "Summary"
}
],
"product_status": {
"known_affected": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003",
"CSAFPID-0004",
"CSAFPID-0005",
"CSAFPID-0006",
"CSAFPID-0007",
"CSAFPID-0008",
"CSAFPID-0009",
"CSAFPID-0010",
"CSAFPID-0011",
"CSAFPID-0012",
"CSAFPID-0013",
"CSAFPID-0014",
"CSAFPID-0015",
"CSAFPID-0016",
"CSAFPID-0017",
"CSAFPID-0018",
"CSAFPID-0019",
"CSAFPID-0020",
"CSAFPID-0021",
"CSAFPID-0022",
"CSAFPID-0023",
"CSAFPID-0024",
"CSAFPID-0025",
"CSAFPID-0026",
"CSAFPID-0027",
"CSAFPID-0028",
"CSAFPID-0029",
"CSAFPID-0030",
"CSAFPID-0031",
"CSAFPID-0032"
]
},
"remediations": [
{
"category": "mitigation",
"details": "Use name servers inside corporate environments",
"product_ids": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003",
"CSAFPID-0004",
"CSAFPID-0005",
"CSAFPID-0006",
"CSAFPID-0007",
"CSAFPID-0008",
"CSAFPID-0009",
"CSAFPID-0010",
"CSAFPID-0011",
"CSAFPID-0012",
"CSAFPID-0013",
"CSAFPID-0014",
"CSAFPID-0015",
"CSAFPID-0016",
"CSAFPID-0017",
"CSAFPID-0018",
"CSAFPID-0019",
"CSAFPID-0020",
"CSAFPID-0021",
"CSAFPID-0022",
"CSAFPID-0023",
"CSAFPID-0024",
"CSAFPID-0025",
"CSAFPID-0026",
"CSAFPID-0027",
"CSAFPID-0028",
"CSAFPID-0029",
"CSAFPID-0030",
"CSAFPID-0031",
"CSAFPID-0032"
]
},
{
"category": "mitigation",
"details": "Restrict access of CLI and web-based management interfaces for the affected devices to a dedicated layer 2 segment/VLAN and/or controlled by firewall policies at layer 3 where possible",
"product_ids": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003",
"CSAFPID-0004",
"CSAFPID-0005",
"CSAFPID-0006",
"CSAFPID-0007",
"CSAFPID-0008",
"CSAFPID-0009",
"CSAFPID-0010",
"CSAFPID-0011",
"CSAFPID-0012",
"CSAFPID-0013",
"CSAFPID-0014",
"CSAFPID-0015",
"CSAFPID-0016",
"CSAFPID-0017",
"CSAFPID-0018",
"CSAFPID-0019",
"CSAFPID-0020",
"CSAFPID-0021",
"CSAFPID-0022",
"CSAFPID-0023",
"CSAFPID-0024",
"CSAFPID-0025",
"CSAFPID-0026",
"CSAFPID-0027",
"CSAFPID-0028",
"CSAFPID-0029",
"CSAFPID-0030",
"CSAFPID-0031",
"CSAFPID-0032"
]
},
{
"category": "mitigation",
"details": "Disable outgoing ICMP packets by using \"service ACLs\" to implement blocking rules",
"product_ids": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003",
"CSAFPID-0004",
"CSAFPID-0005",
"CSAFPID-0006",
"CSAFPID-0007",
"CSAFPID-0008",
"CSAFPID-0009",
"CSAFPID-0010",
"CSAFPID-0011",
"CSAFPID-0012",
"CSAFPID-0013",
"CSAFPID-0014",
"CSAFPID-0015",
"CSAFPID-0016",
"CSAFPID-0017",
"CSAFPID-0018",
"CSAFPID-0019",
"CSAFPID-0020",
"CSAFPID-0021",
"CSAFPID-0022",
"CSAFPID-0023",
"CSAFPID-0024",
"CSAFPID-0025",
"CSAFPID-0026",
"CSAFPID-0027",
"CSAFPID-0028",
"CSAFPID-0029",
"CSAFPID-0030",
"CSAFPID-0031",
"CSAFPID-0032"
]
},
{
"category": "vendor_fix",
"details": "Update to V2.2.28 or later version",
"product_ids": [
"CSAFPID-0013",
"CSAFPID-0014",
"CSAFPID-0016",
"CSAFPID-0025",
"CSAFPID-0026",
"CSAFPID-0027"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109817067/"
},
{
"category": "vendor_fix",
"details": "Update to V6.4 or later version",
"product_ids": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109794349/"
},
{
"category": "vendor_fix",
"details": "Update to V3.0 SP1 or later version",
"product_ids": [
"CSAFPID-0024"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109793790/"
},
{
"category": "vendor_fix",
"details": "Update to V2.1.3 or later version",
"product_ids": [
"CSAFPID-0004"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109793041/"
},
{
"category": "vendor_fix",
"details": "Update to V8.7.1.3 or later version",
"product_ids": [
"CSAFPID-0005"
],
"url": "https://support.industry.siemens.com/cs/de/en/view/109802805/"
},
{
"category": "vendor_fix",
"details": "Update to V3.3 or later version",
"product_ids": [
"CSAFPID-0010",
"CSAFPID-0011"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109799584/"
},
{
"category": "vendor_fix",
"details": "Update to V3.3.46 or later version",
"product_ids": [
"CSAFPID-0009",
"CSAFPID-0012",
"CSAFPID-0029",
"CSAFPID-0030"
],
"url": "https://support.industry.siemens.com/cs/us/en/view/109812218/"
},
{
"category": "vendor_fix",
"details": "Update to V3.0 or later version",
"product_ids": [
"CSAFPID-0015"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109800773"
},
{
"category": "vendor_fix",
"details": "Update to V1.1 or later version",
"product_ids": [
"CSAFPID-0017"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109811116/"
},
{
"category": "vendor_fix",
"details": "Update to V2.2 Update 1 or later version",
"product_ids": [
"CSAFPID-0031",
"CSAFPID-0032"
],
"url": "https://support.industry.siemens.com/cs/de/en/view/109803672/"
},
{
"category": "vendor_fix",
"details": "Update to V1.6 or later version",
"product_ids": [
"CSAFPID-0006",
"CSAFPID-0007"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109803418/"
},
{
"category": "vendor_fix",
"details": "Update to V3.1 or later version",
"product_ids": [
"CSAFPID-0018",
"CSAFPID-0019",
"CSAFPID-0020",
"CSAFPID-0021",
"CSAFPID-0022",
"CSAFPID-0023"
],
"url": "https://support.industry.siemens.com/cs/de/en/view/109804366"
},
{
"category": "vendor_fix",
"details": "Update to V3.3 or later version",
"product_ids": [
"CSAFPID-0008",
"CSAFPID-0028"
],
"url": "https://support.industry.siemens.com/cs/ww/en/view/109799604/"
}
],
"scores": [
{
"cvss_v3": {
"baseScore": 7.4,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C",
"version": "3.1"
},
"products": [
"CSAFPID-0001",
"CSAFPID-0002",
"CSAFPID-0003",
"CSAFPID-0004",
"CSAFPID-0005",
"CSAFPID-0006",
"CSAFPID-0007",
"CSAFPID-0008",
"CSAFPID-0009",
"CSAFPID-0010",
"CSAFPID-0011",
"CSAFPID-0012",
"CSAFPID-0013",
"CSAFPID-0014",
"CSAFPID-0015",
"CSAFPID-0016",
"CSAFPID-0017",
"CSAFPID-0018",
"CSAFPID-0019",
"CSAFPID-0020",
"CSAFPID-0021",
"CSAFPID-0022",
"CSAFPID-0023",
"CSAFPID-0024",
"CSAFPID-0025",
"CSAFPID-0026",
"CSAFPID-0027",
"CSAFPID-0028",
"CSAFPID-0029",
"CSAFPID-0030",
"CSAFPID-0031",
"CSAFPID-0032"
]
}
],
"title": "CVE-2020-25705"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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