6.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
7.2 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
7.3 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
0.4%
Ivan Sanchez from Nullcode Team has identified a DLL Hijacking vulnerability in Open Automation Software’s OPC Systems.NET application. Open Automation Software has reviewed the vulnerability and determined not to patch the issue at this time.
This vulnerability could be exploited remotely with social engineering.
The following OPC Systems.NET versions are affected:
Exploitation of DLL Hijack vulnerabilities gives an attacker access to the system with the same privilege level as the application that utilizes the malicious DLL.
Impact to individual organizations depends on many factors that are unique to each organization. NCCIC/ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Open Automation Software is a US-based company with offices around the world.
The affected product, OPC Systems.NET, is a NET product for supervisory control and data acquisition (SCADA) and human-machine interface (HMI) applications.
According to Open Automation Software, OPC Systems.NET is an HMI application that is deployed across several sectors including Critical Manufacturing, Energy, Water and Wastewater Systems, and others. Open Automation Software estimates that these products are used throughout the world with primary use in the United States.
A successful exploit of this vulnerability requires the local user to install a crafted DLL on the victim machine. The application loads the DLL and gives the attacker access at the same privilege level as the application.
CVE-2015-7917NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-7917, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory. has been assigned to this vulnerability. A CVSS v3 base score of 7.2 and a temporal score of 6.5 have been assigned; the CVSS vector string is (AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:U/RC:R).CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H/E:P/RL:U/RC:R, web site last accessed December 10, 2015.
This vulnerability is not exploitable remotely and cannot be exploited without user interaction. The exploit is only triggered when a local user runs the vulnerable application and loads the malformed DLL file.
No known public exploits specifically target this vulnerability.
Crafting a working exploit for this vulnerability would be difficult. Social engineering is required to convince the user to accept the malformed DLL file. Additional user interaction is needed to load the malformed file. This decreases the likelihood of a successful exploit.
Open Automation Software has passed the researcher information to its support team to assist customers in the event that they encounter this vulnerability. Users who believe their Open Automation Software OPC Systems.NET is compromised or not functioning correctly should contact Open Automation Software at:
Open Automation Software
[email protected]
1-800-533-4994
ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page at: http://ics-cert.us-cert.gov/content/recommended-practices. 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 in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site (http://ics-cert.us-cert.gov/).
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.
In addition, ICS-CERT recommends that users take the following measures to protect themselves from social engineering attacks:
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6.9 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:C/I:C/A:C
7.2 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
7.3 High
AI Score
Confidence
High
0.0004 Low
EPSS
Percentile
0.4%