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This advisory is a follow-up to the alert titled “ICS-ALERT-12-020-06 - WellinTech KingSCADA Insecure Password Encryption Vulnerability” that was published January 20, 2012, on the ICS-CERT web page.
Independent researchers Alexandr Polyakov and Alexey Sintsov from DSecRG identified an unsecure password encryption vulnerability in WellinTech KingSCADA application. When KingSCADA OPCServer and OPCClient are not on the same node, a remote attacker may obtain passwords to the system. DSecRG disclosed this vulnerability on its website without coordination with ICS-CERT, the vendor, or any other coordinating entity. An exploit is known to be publicly available.
ICS-CERT has coordinated the mitigation of this vulnerability with WellinTech, which has produced a new version of KingSCADA that resolves the problem. ICS-CERT has not tested this version to verify that the vulnerability is resolved.
The following WellinTech KingSCADA versions are affected:
- WellinTech KingSCADA 3.0.
This vulnerability allows an attacker with access to the password storage file to decode all passwords and use those passwords to access the system as a normal user.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
WellinTech is a software development company specializing in the Automation and Control industry based in Beijing, China. According to WellinTech, they also have branches in United States, Japan, Singapore, Europe, and Taiwan.
The WellinTech website describes KingSCADA as a Windows-based control, monitoring, and data collection application used across several industries including power, water, building automation, mining, and other sectors.
Insecure Password Encryptiona
System passwords are stored in a file format that is easy for an attacker to decode. If an attacker is able to access and decode this file, he will be able to log into the system as a normal user or administrator.
CVE-2012-1977 has been assigned to this vulnerability. A CVSS V2 base score of 7.2 has also been assigned.
This vulnerability is remotely exploitable.
Existence of Exploit
Public exploit(s) are known to target this vulnerability.
An attacker with a low skill level would be able to exploit this vulnerability.
WellinTech has provided the following link to the latest version of KingSCADA: http://download.kingview.com/software/KingSCADA/EN/KingSCADA3.1_2012-04-16EN.rar.
According to WellinTech, this new version securely hashes passwords. ICS-CERT has not tested the new version to verify this.
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 systems 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.
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.
- a. CWE-311: Missing Encryption of Sensitive Data, http://cwe.mitre.org/data/definitions/311.html, website last accessed May 08, 2012.
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