CitectSCADA and Mitsubishi MX4 SCADA Batch Server Buffer Overflow
Low RiskICS-CERT ICSA-11-279-02Jul 9, 2011
Summary
Buffer overflow vulnerability in the Batch Server module of CitectSCADA (version 7.10 and earlier) and MX4 SCADA (version 7.10 and earlier). The vulnerability exists in the batch processing subsystem and could allow remote code execution. Affected versions have reached end-of-life status and vendors have not released patches.
What this means
What could happen
A buffer overflow in the Batch Server module could allow an attacker to execute arbitrary code on the SCADA server, potentially disrupting batch process automation, data logging, or historian functions across dependent control systems.
Who's at risk
Operators using Schneider Electric CitectSCADA or Mitsubishi MX4 SCADA batch automation modules in energy facilities, manufacturing plants, or water/wastewater systems that rely on automated batch processing, recipe execution, or scheduled batch jobs.
How it could be exploited
An attacker with network access to the Batch Server module could send a specially crafted input or network request that overflows a buffer in memory, allowing injection of malicious code. This code would run with the privileges of the SCADA server process, affecting all batch operations managed by that server.
Prerequisites
- Network access to the Batch Server service port
- Knowledge of buffer overflow vulnerability location and payload structure
- No credentials or special authentication required
remotely exploitableno authentication requiredno patch availablebuffer overflow (CWE-119) allows code execution
Exploitability
Low exploit probability (EPSS 0.2%)
Affected products (2)
2 pending
ProductAffected VersionsFix Status
Schneider Electric CitectSCADA using the CitectSCADA Batch Server module: <=V7.10≤ V7.10No fix yet
Mitsubishi MX4 SCADA using the MX4 SCADA Batch module: <=V7.10≤ V7.10No fix yet
Remediation & Mitigation
0/4
Do now
0/2HARDENINGIsolate Batch Server modules on a separate network segment with firewall rules that restrict inbound access to only authorized engineering workstations and control systems
WORKAROUNDDisable Batch Server module services if not actively used in operations; remove or uninstall unused batch automation components
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HARDENINGMonitor network traffic to Batch Server ports for unauthorized connection attempts and unusual payload sizes
Long-term hardening
0/1HARDENINGEvaluate upgrade path or replacement of CitectSCADA and MX4 SCADA systems to versions that include patches or successor products with security fixes
CVEs (1)
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