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Moxa SoftCMS Buffer Overflow Vulnerabilities

Low RiskICS-CERT ICSA-15-239-01May 30, 2015
Summary

Moxa SoftCMS versions 1.3 and earlier contain buffer overflow vulnerabilities (CWE-122, CWE-120) that could allow an attacker to execute arbitrary code on affected systems. SoftCMS is used for SCADA monitoring and HMI functionality in critical infrastructure. No vendor fix is planned for this product.

What this means
What could happen
A buffer overflow in Moxa SoftCMS could allow an attacker to execute arbitrary code on the system running the software, potentially compromising monitoring and control of SCADA/HMI operations.
Who's at risk
Water utilities, electric utilities, and other critical infrastructure operators using Moxa SoftCMS for SCADA/HMI monitoring and engineering workstations. This affects organizations that rely on Moxa's software for remote or local system monitoring and control.
How it could be exploited
An attacker with network access to SoftCMS would send a specially crafted input to trigger the buffer overflow condition (CWE-122/CWE-120), allowing code execution on the host system. The exact attack vector (network protocol, file parsing, or command-line input) is not specified in the advisory.
Prerequisites
  • Network access to the SoftCMS system
  • Ability to send a malformed input to the vulnerable component
no patch availablebuffer overflow vulnerabilitypotential for arbitrary code execution
Exploitability
Moderate exploit probability (EPSS 1.2%)
Affected products (1)
ProductAffected VersionsFix Status
SoftCMS: <=1.3≤ 1.3No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDImplement network access controls (firewall rules) to restrict connectivity to SoftCMS to only authorized engineering workstations and control systems
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HARDENINGMonitor system logs and network traffic to SoftCMS systems for signs of exploitation attempts
Mitigations - no patch available
0/2
SoftCMS: <=1.3 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGIsolate or air-gap SoftCMS systems from untrusted networks where possible
HARDENINGRun SoftCMS on a dedicated system with minimal exposed services; disable unnecessary network interfaces if feasible
View full CISA ICS-CERT advisory
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