AutomationDirect Stride Field I/O
Plan Patch9.6ICS-CERT ICSA-22-202-05Jul 21, 2022
Attack VectorAdjacent
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary
AutomationDirect Stride Modbus Field I/O modules contain an unencrypted credential storage vulnerability (CWE-319) that allows an attacker with network access to extract user credentials. Affected firmware versions include SIO-MB04ADS (<8.4.3.0), SIO-MB04DAS (<8.11.3.0), SIO-MB04RTDS (<8.3.4.0), SIO-MB04THMS (<8.5.4.0), SIO-MB08ADS-1 (<8.6.3.0), SIO-MB08ADS-2 (<8.7.3.0), SIO-MB08THMS (<8.8.4.0), SIO-MB12CDR (<8.0.4.0), SIO-MB16CDD2 (<8.1.4.0), and SIO-MB16ND3 (<8.2.4.00). Certain hardware batches (B/N 5714442222 for SIO-MB04ADS and SIO-MB12CDR, and B/N 57141862221 for SIO-MB04THMS) cannot be patched and require RMA replacement. Compromised credentials could enable an attacker to gain unauthorized access to the broader automation control system and modify process parameters or disable critical functions.
What this means
What could happen
An attacker with access to the network could extract user credentials stored on these Stride Modbus Field I/O units, potentially compromising access to the broader automation control system and allowing unauthorized changes to process settings or operational parameters.
Who's at risk
Water authorities, municipal electric utilities, and other critical infrastructure operators using AutomationDirect Stride Modbus Field I/O modules (SIO-MB series) for remote input/output control. These modules are commonly used in SCADA and PLC-based automation systems to acquire sensor data and control field devices such as pumps, valves, and motors.
How it could be exploited
An attacker with network access to a Stride Field I/O module could exploit the credential storage vulnerability to read plaintext or weakly protected credentials. These credentials could then be used to access other devices on the automation network, such as PLCs or HMIs, to alter control logic or process setpoints.
Prerequisites
- Network access to the Stride Field I/O module (local network or adjacent segment, given CVSS vector AV:A)
- No authentication or special credentials required to trigger the vulnerability
- Module must be running affected firmware version
Remotely exploitable from adjacent network segmentNo authentication requiredLow attack complexityAffects multiple Field I/O module variantsNo patch available for some hardware batches (requires RMA replacement)Could lead to credential compromise and lateral movement in control system
Exploitability
Low exploit probability (EPSS 0.1%)
Affected products (14)
13 with fix1 pending
ProductAffected VersionsFix Status
SIO- MB04ADS: firmware< 8.4.3.0No fix yet
SIO-MB04DAS: firmware< 8.11.3.08.11.3.0
SIO-MB04RTDS: firmware< 8.3.4.08.3.4.0
SIO-MB04THMS: firmware< 8.5.4.08.5.4.0
SIO-MB04THMS: B/N 57141862221571418622218.5.4.0
SIO-MB08ADS-1: firmware< 8.6.3.08.6.3.0
SIO-MB08ADS-2: firmware< 8.7.3.08.7.3.0
SIO-MB08THMS: firmware< 8.8.4.08.8.4.0
Remediation & Mitigation
0/14
Do now
0/2HARDENINGRestrict network access to Stride Field I/O modules using firewalls and network segmentation; isolate automation networks from untrusted segments
WORKAROUNDImplement physical access controls to prevent unauthorized connections to Field I/O modules
Schedule — requires maintenance window
0/11Patching may require device reboot — plan for process interruption
HOTFIXUpgrade firmware on SIO-MB04ADS to version 8.4.3.0 or later
HOTFIXUpgrade firmware on SIO-MB04DAS to version 8.11.3.0 or later
HOTFIXUpgrade firmware on SIO-MB04RTDS to version 8.3.4.0 or later
HOTFIXUpgrade firmware on SIO-MB04THMS to version 8.5.4.0 or later
HOTFIXUpgrade firmware on SIO-MB08ADS-1 to version 8.6.3.0 or later
HOTFIXUpgrade firmware on SIO-MB08ADS-2 to version 8.7.3.0 or later
HOTFIXUpgrade firmware on SIO-MB08THMS to version 8.8.4.0 or later
HOTFIXUpgrade firmware on SIO-MB12CDR to version 8.0.4.0 or later
HOTFIXUpgrade firmware on SIO-MB16CDD2 to version 8.1.4.0 or later
HOTFIXUpgrade firmware on SIO-MB16ND3 to version 8.2.4.00 or later
HOTFIXFor modules with batch numbers 5714442222 (SIO-MB04ADS and SIO-MB12CDR) and 57141862221 (SIO-MB04THMS): contact AutomationDirect for RMA and request replacement modules
Long-term hardening
0/1HARDENINGReview and follow AutomationDirect Security Considerations document and product advisory PA-COM-006
CVEs (1)
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