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
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
EPSS
Percentile
85.4%
CVSS v3 8.6
ATTENTION: Exploitable remotely/low attack complexity
Vendor: Rockwell Automation
**Equipment:**CompactLogix 5370
**Vulnerabilities:**Uncontrolled Resource Consumption, Stack-based Buffer Overflow
This updated advisory is a follow-up to the original advisory titled “ICSA-19-120-01 Rockwell Automation CompactLogix 5370” that was published April 30, 2019, on the ICS webpage on cisa.gov/ICS.
Successful exploitation of these vulnerabilities could allow a remote attacker to render the web server unavailable and/or place the controller in a major non-recoverable faulted state (MNRF).
--------- Begin Update A Part 1 of 1 ---------
Rockwell Automation reports these vulnerabilities affect the following CompactLogix 5370 programmable automation controllers:
--------- End Update A Part 1 of 1 ---------
4.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
An attacker could send a crafted HTTP/HTTPS request to render the web server unavailable and/or lead to remote code execution caused by a stack-based buffer overflow vulnerability. A cold restart is required for recovering the system.
CVE-2019-10952 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
4.2.2 STACK-BASED BUFFER OVERFLOW CWE-121
An attacker could send crafted SMTP packets to cause a denial-of-service condition where the controller enters a major non-recoverable faulted state (MNRF).
CVE-2019-10954 has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H).
Younes Dragoni of Nozomi Networks and George Lashenko of CyberX reported these vulnerabilities to CISA.
Rockwell Automation strongly encourages users to apply the latest available version of firmware to keep up to date with the latest features, anomaly fixes, and security improvements. Update firmware to version FRN 31.011 which mitigates the associated risk:
Rockwell Automation also recommends the following:
For more information, please refer to Rockwell’s Security Advisory: <https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1075979> (login required)
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 at cisa.gov/ics. 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.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
No known public exploits specifically target these vulnerabilities. These vulnerabilities are exploitable remotely. These vulnerabilities have low attack complexity.
literature.rockwellautomation.com/idc/groups/literature/documents/um/1783-um007_-en-p.pdf
literature.rockwellautomation.com/idc/groups/literature/documents/um/1783-um007_-en-p.pdf
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10952
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-10954
cisa.gov/ics
cisa.gov/ics
cisasurvey.gov1.qualtrics.com/jfe/form/SV_9n4TtB8uttUPaM6?product=https://www.cisa.gov/news-events/ics-advisories/icsa-19-120-01
compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?Keyword=5370&crumb=112
cwe.mitre.org/data/definitions/121.html
cwe.mitre.org/data/definitions/400.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
rockwellautomation.custhelp.com/app/answers/detail/a_id/1075979
rockwellautomation.custhelp.com/app/answers/detail/a_id/494865/page/1
rockwellautomation.custhelp.com/app/answers/detail/a_id/898270/page/1
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us-cert.cisa.gov/ics/Recommended-Practices
us-cert.cisa.gov/sites/default/files/recommended_practices/NCCIC_ICS-CERT_Defense_in_Depth_2016_S508C.pdf
www.cisa.gov/uscert/ics/tips/ICS-TIP-12-146-01B
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www.dhs.gov/performance-financial-reports
www.facebook.com/CISA
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
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mailto:?subject=Rockwell%20Automation%20CompactLogix%205370%20%28Update%20A%29&body=www.cisa.gov/news-events/ics-advisories/icsa-19-120-01
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
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
EPSS
Percentile
85.4%