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1. EXECUTIVE SUMMARY
- CVSS v3 9.8
- ATTENTION: Remotely exploitable/low skill level to exploit
- Vendor: Advantech
- Equipment: WebAccess
- Vulnerabilities: SQL Injection, Improper Authorization, Path Traversal, Heap-based Buffer Overflow, Stack-based Buffer Overflow, Untrusted Pointer Dereference, Improper Privilege Management, and External Control of File Name or Path
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to disclose sensitive information from the host and/or target, execute arbitrary code, or delete files.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of WebAccess products are affected:
- WebAccess versions V8.2_20170817 and prior,
- WebAccess versions V8.3.0 and prior,
- WebAccess Dashboard versions V.2.0.15 and prior,
- WebAccess Scada Node versions prior to 8.3.1,
- WebAccess/NMS 2.0.3 and prior.
3.2 VULNERABILITY OVERVIEW
Several SQL injection vulnerabilities have been identified, which may allow an attacker to disclose sensitive information from the host.
An information exposure vulnerability through directory listing has been identified, which may allow an attacker to find important files that are not normally visible.
A TFTP application has unrestricted file uploads to the web application without authorization, which may allow an attacker to execute arbitrary code.
3.2.4 PATH TRAVERSAL CWE-22
A path transversal vulnerability has been identified, which may allow an attacker to disclose sensitive information on the target.
3.2.5 PATH TRAVERSAL CWE-22
A path transversal vulnerability has been identified, which may allow an attacker to execute arbitrary code.
Several stack-based buffer overflow vulnerabilities have been identified, which may allow an attacker to execute arbitrary code.
A heap-based buffer overflow vulnerability has been identified, which may allow an attacker to execute arbitrary code.
Several untrusted pointer dereference vulnerabilities have been identified, which may allow an attacker to execute arbitrary code.
An external control of file name or path vulnerability has been identified, which may allow an attacker to delete files.
An origin validation error vulnerability has been identified, which may allow an attacker to create a malicious web site, steal session cookies, and access data of authenticated users.
An improper privilege management vulnerability may allow an authenticated user to modify files when read access should only be given to the user.
- Critical Infrastructure Sectors: Critical Manufacturing, Energy, Water and Wastewater Systems
- Countries/Areas Deployed: East Asia, United States, Europe
- Company Headquarters Location: Taiwan
Mat Powell and Fritz Sands of Trend Micro’s Zero Day Initiative; Ariele Caltabiano (kimiya) and rgod working with Trend Micro’s Zero Day Initiative; Steven Seeley of Offensive Security, working with Trend Micro's Zero Day Initiative; and Donato Onofri and Simone Onofri of Business Integration Partners S.p.A. reported these vulnerabilities to NCCIC.
Advantech has released Version 8.3.1 of WebAccess to address the reported vulnerabilities. Users can download the latest version of WebAccess at the following location:
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.
- 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 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.
Additional mitigation guidance and recommended practices are publicly available in the NCCIC 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.
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.
For any questions related to this report, please contact the NCCIC at:
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