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This advisory is a follow-up to the Alert titled “ICS-ALERT-11-256-01 – Progea Movicon PowerHMI Vulnerabilities” that was published September 13, 2011, on the ICS-CERT web page.
Two buffer overflow and one memory corruption vulnerability were disclosed affecting the Progea Movicon’s PowerHMI product.
ICS-CERT has coordinated these vulnerabilities with Progea and they have produced a hotfix that mitigates these vulnerabilities.
The following products are affected:
- Progea Movicon 11.2.1085.3 and earlier.
- Progea Movicon PowerHMI 11.2.1085 and earlier.
Each of these vulnerabilities can be remotely exploitable to cause denial of service, system crash, or execution of arbitrary code.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their environment, architecture, and product implementation.
Progea Srl is an Italian company that offers SCADA products, which are deployed primarily in Europe, India, and the United States. They are used in energy, water, critical manufacturing, and several other industry sectors.
Movicon 11 is an XML-based HMI development system that includes drivers for programmable logic controllers (PLCs). Movicon provides OPC-based connectivity for data transfer, including OPC DA and OPC XML DA services.
A heap-based buffer overflow allows remote attackers to use an HTTP request on Port 808/TCP to cause a denial of service and possibly execute arbitrary code via a negative content-length field.
CVE-2011-3491 has been assigned to this vulnerability. A CVSS v2 base score of 10.0 has also been assigned.
A heap-based buffer overflow allows remote attackers to use an HTTP request on Port 808/TCP to cause a denial of service and possibly execute arbitrary code via a long request.
CVE-2011-3498 has been assigned to this vulnerability. A CVSS v2 base score of 10.0 has also been assigned.
This vulnerability allows remote attackers using a Port 808/TCP HTTP request and Port 12233/TCP EIDP protocol to cause a denial of service and possibly execute arbitrary code via an EIDP packet with a large size field, which writes a zero byte to an arbitrary memory location.
CVE-2011-3499 has been assigned to this vulnerability. A CVSS v2 base score of 10.0 has also been assigned.
These vulnerabilities are remotely exploitable.
Existence of Exploit
Public exploit(s) are known to target these vulnerabilities.
An attacker with a low skill level can create a denial of service attack but a skilled attacker would be able to execute arbitrary code.
ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks.
- Minimize network exposure for all control system devices. Critical devices should not directly face the Internet.
- 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 VPN is only as secure as the connected devices.
The Control Systems Security Program (CSSP) also provides a section for control system security recommended practices on the CSSP web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to taking defensive measures.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
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