T0819_exploit-public-facing-application
DevOps & SecurityAdversaries may leverage weaknesses to exploit internet-facing software for initial access into an industrial network.
How to use this skill
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T0819 Exploit Public-Facing Application
High-Level Description
Adversaries may leverage weaknesses to exploit internet-facing software for initial access into an industrial network. Internet-facing software may be user applications, underlying networking implementations, an assets operating system, weak defenses, etc. Targets of this technique may be intentionally exposed for the purpose of remote management and visibility.
An adversary may seek to target public-facing applications as they may provide direct access into an ICS environment or the ability to move into the ICS network. Publicly exposed applications may be found through online tools that scan the internet for open ports and services. Version numbers for the exposed application may provide adversaries an ability to target specific known vulnerabilities. Exposed control protocol or remote access ports found in Commonly Used Port may be of interest by adversaries.
Kill Chain Phase
- Initial Access (TA0108)
Platforms: ICS
What to Check
- Identify if Exploit Public-Facing Application technique is applicable to target ICS environment
- Check ICS/SCADA systems for indicators of Exploit Public-Facing Application
- Verify mitigations are bypassed or absent (6 known mitigations)
- Assess detection coverage (1 detection strategies)
How to Test
Identify Attack Surface
Determine if the target ICS/SCADA environment is susceptible to Exploit Public-Facing Application by examining operational technology systems and network architecture.
Assess Existing Defenses
Review whether mitigations for T0819 are in place. If defenses are absent or misconfigured, this technique may be exploitable in the ICS environment.
Remediation Guide
M0951 Update Software
Regularly scan externally facing systems for vulnerabilities and establish procedures to rapidly patch systems when critical vulnerabilities are discovered through scanning and public disclosure.
M0916 Vulnerability Scanning
Regularly scan externally facing systems for vulnerabilities and establish procedures to rapidly patch systems when critical vulnerabilities are discovered through scanning and public disclosure.
M0950 Exploit Protection
Web Application Firewalls may be used to limit exposure of applications to prevent exploit traffic from reaching the application.
M0926 Privileged Account Management
Use least privilege for service accounts.
M0948 Application Isolation and Sandboxing
Application isolation will limit the other processes and system features an exploited target can access. Examples of built in features are software restriction policies, AppLocker for Windows, and SELinux or AppArmor for Linux.
M0930 Network Segmentation
Segment externally facing servers and services from the rest of the network with a DMZ or on separate hosting infrastructure.
Detection
Detection of Exploit Public-Facing Application
Risk Assessment
| Finding | Severity | Impact |
|---|---|---|
| Exploit Public-Facing Application technique applicable | High | Initial Access |
CWE Categories
| CWE ID | Title |
|---|---|
| CWE-20 | Improper Input Validation |