7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9 High
AI Score
Confidence
High
0.007 Low
EPSS
Percentile
80.9%
Successful exploitation of these vulnerabilities could allow a denial-of-service condition, remote code execution, or leak information that could be used to bypass address space layout randomization (ASLR).
The following versions of FactoryTalk Linx are affected:
A flaw exists in the Ingress/Egress checks routine of FactoryTalk Linx. This vulnerability could allow a remote, unauthenticated attacker to specifically craft a malicious packet resulting in a denial-of-service condition on the device.
CVE-2020-27253 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
A heap overflow vulnerability exists within FactoryTalk Linx. This vulnerability could allow a remote, unauthenticated attacker to send malicious port ranges, which could result in remote code execution.
CVE-2020-27251 has been assigned to this vulnerability. A CVSS v3 base score of 9.8 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
A heap overflow vulnerability exists within FactoryTalk Linx. This vulnerability could allow a remote, unauthenticated attacker to send malicious set attribute requests, which could result in the leaking of sensitive information. This information disclosure could lead to the bypass of address space layout randomization (ASLR).
CVE-2020-27255 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Sharon Brizinov of Claroty reported these vulnerabilities to Rockwell Automation PSIRT.
Rockwell Automation recommends users of the affected FactoryTalk Linx update to an available software revision that addresses the associated risk.
Rockwell Automation recommends users who are unable to update the following mitigations or workarounds to further reduce risk. Users are encouraged, when possible, to combine these with general security guidelines to employ multiple strategies simultaneously:
For more information refer to Rockwellโs Industrial Security Advisory ID 1128684 (login required).
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-12-146-01BโTargeted 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.
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-27251
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-27253
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2020-27255
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/122.html
cwe.mitre.org/data/definitions/20.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1126433/loc/en_US#__highlight
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rockwellautomation.custhelp.com/app/answers/detail/a_id/494865
rockwellautomation.custhelp.com/app/answers/detail/a_id/546989
twitter.com/CISAgov
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us-cert.cisa.gov/ics/recommended-practices
us-cert.cisa.gov/ics/tips/ICS-TIP-12-146-01B
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.dhs.gov
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mailto:?subject=Rockwell%20Automation%20FactoryTalk%20Linx&body=www.cisa.gov/news-events/ics-advisories/icsa-20-329-01
7.8 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:N/I:N/A:C
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9 High
AI Score
Confidence
High
0.007 Low
EPSS
Percentile
80.9%