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This Alert Update is a follow-up to the original ICS-CERT Alert titled “ICS-ALERT-11-256-05—ROCKWELL RSLOGIX OVERFLOW VULNERABILITY” that was published September 13, 2011, on the ICS-CERT web page.
ICS-CERT is aware of a public report of an overflow vulnerability with proof-of-concept (POC) exploit code affecting the Rockwell RSLogix 5000, Version 19. According to this report, services running on Port 4446 are vulnerable to a memory overflow. This report was released without coordination with either the vendor or ICS-CERT.
ICS-CERT has not yet verified the vulnerabilities or POC code, but has reached out to the affected vendor to notify, confirm, and identify mitigations. ICS-CERT is issuing this alert to provide early notice of the report and identify baseline mitigations for reducing risks to these and other cybersecurity attacks.
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Rockwell has released the following advisories:
Security Advisory Index: http://rockwellautomation.custhelp.com/app/answers/detail/a_id/54102
FactoryTalk RnaUtility.dll Vulnerability September 16, 2011, Advisory: http://rockwellautomation.custhelp.com/app/answers/detail/a_id/456144
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The report included vulnerability details and POC exploit code for the following vulnerability:
|Overflow||Remote||Denial of Service|
|Text 2A||Text 2B||Text 2C|
Please report any issues affecting control systems in critical infrastructure environments to ICS-CERT.
Rockwell Automation provides industrial automation control and information products worldwide, across a wide range of industries.
The Rockwell RSLogix family is a group of ladder logic programming packages that operates on
Microsoft Windows operating systems.
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RSLogix 5000 supports the Allen-Bradley ControlLogix and GuardLogix family of programmable
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ICS-CERT released a follow-up advisory, ICSA-11-273-03 - Rockwell RSLogix Overflow Vulnerability, on September 30, 2011.
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Rockwell Automation is aware of this vulnerability and plans to release a software patch within 14 days. Rockwell recommends configuring firewalls to block the following TCP ports to prevent traversal of RNA messages in and out of the ICS system:
Rockwell also recommends users evaluate firewall configurations to ensure other appropriate inbound and
outbound traffic is blocked.
MITRE has assigned number CVE-2011-3489 to this vulnerability.
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ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these
vulnerabilities. Specifically, users should:
- Minimize network exposure for all control system devices. Control system devices should not directly face the Internet.a
- Locate control system networks and devices behind firewalls, and isolate them from the business network.
- If remote access is required, employ secure methods such as Virtual Private Networks (VPNs).
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.
The Control System Security Program also provides a recommended practices section for control systems on the US-CERT website. Several recommended practices are available for reading or download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Organizations that observe any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
- a. ICS-CERT ALERT, http://ics-cert.us-cert.gov/alerts/ICS-Alert-10-301-01, last accessed September 13, 2011.
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