Rockwell Automation CompactLogix 5370 Uncontrolled Resource Consumption, Stack-based Buffer Overflow (CVE-2019-10954 CVE-2019-10952 )

# ICS Advisory (ICSA-19-120-01) ## Rockwell Automation CompactLogix 5370 Original release date: April 30, 2019 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-120-01) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-120-01) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-19-120-01) ### Legal Notice All information products included in [https://us-cert.gov/ics](/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://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 8.6** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** Rockwell Automation * **Equipment:** CompactLogix 5370 * **Vulnerabilities:** Uncontrolled Resource Consumption, Stack-based Buffer Overflow ## 2\. RISK EVALUATION 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). ## 3\. TECHNICAL DETAILS ### 3.1 AFFECTED PRODUCTS The following versions of CompactLogix 5370, a programmable automation controller, are affected: * CompactLogix 5370 L1 controllers Version 20 to 30.014 and earlier * CompactLogix 5370 L2 controllers Versions 20 to 30.014 and earlier * CompactLogix 5370 L3 controllers Versions 20 to 30.014 and earlier * Compact GuardLogix 5370 controllers Versions 20 to 30.014 and earlier * Armor Compact GuardLogix 5370 controllers, Versions 20 to 30.014 and earlier ### 3.2 VULNERABILITY OVERVIEW **3.2.1 [UNCONTROLLED RESOURCE CONSUMPTION CWE-400](https://cwe.mitre.org/data/definitions/400.html)** 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)). **3.2.2 [STACK-BASED BUFFER OVERFLOW CWE-121](https://cwe.mitre.org/data/definitions/121.html)** 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](http://web.nvd.nist.gov/view/vuln/detail?vulnId=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](https://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)). ### 3.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Critical Manufacturing * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** United States ### 3.4 RESEARCHER Younes Dragoni of Nozomi Networks reported CVE-2019-10952 to NCCIC. George Lashenko of CyberX reported CVE-2019-10954 to NCCIC. ## 4\. MITIGATIONS Rockwell recommends the following: * 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 to a version of firmware as listed below that mitigates the associated risk: Apply FRN 31.011 or later from: [https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?Keyword=5370&crumb=112 ](https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?Keyword=5370&crumb=112 ) * For EtherNet/IP-based vulnerabilities (ID 1-14), block all traffic to and from outside the Manufacturing Zone by blocking or restricting access to Port 2222/TCP/UDP and Port 44818/TCP/UDP using proper network infrastructure controls, such as firewalls, UTM devices, or other security appliances. For more information on TCP/UDP ports used by Rockwell Automation Products, see Knowledgebase Article ID [898270](https://rockwellautomation.custhelp.com/app/answers/detail/a_id/898270/page/1) (login required). * Stratix users can use Device Manager or Studio 5000 Logix Designer to configure access control lists (ACL) to block/restrict ports. See section "Access Control Lists" in [Stratix Managed Switches User Manual, publication 1783-UM007](http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1783-um007_-en-p.pdf), for detailed instructions. * For web-based vulnerabilities (ID 15-17), block all traffic from outside the Manufacturing Zone by blocking or restricting access to Port 80/443/TCP. * Stratix users can use Device Manager or Studio 5000 Logix Designer to configure ACL's to block/restrict ports. See section "Access Control Lists" in [Stratix Managed Switches User Manual, publication 1783-UM007](http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1783-um007_-en-p.pdf), for detailed instructions. * Utilize proper network infrastructure controls, such as firewalls, to help ensure that SMTP packets from unauthorized sources are blocked. * Consult the product documentation for specific features, such as a hardware key-switch setting, which may be used to block unauthorized changes, etc. * Use trusted software, software patches, and antivirus/antimalware programs and interact only with trusted websites and attachments. * Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet. For further information about the risks of unprotected Internet accessible control systems, please see Knowledgebase Article ID [494865](https://rockwellautomation.custhelp.com/app/answers/detail/a_id/494865/page/1) (login required). * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that a VPN is only as secure as the connected devices. For more information please refer to Rockwell's Security Advisory: <https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1075979> (login required) NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](/ics/alerts/ICS-ALERT-10-301-01). * Locate control system networks and remote devices behind firewalls, and isolate them from the business network. * When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for [control systems security recommended practices](/ics/content/recommended-practices) on the ICS-CERT web page. Several recommended practices are available for reading and download, including [Improving Industrial Control Systems Cybersecurity with Defense-in- Depth Strategies](/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS-CERT website](/ics/) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](/ics/tips/ICS-TIP-12-146-01B). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target these vulnerabilities.