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Moxa IKS, EDS (Update A)

Act Now9.8ICS-CERT ICSA-19-057-01Feb 26, 2019
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Moxa IKS-G6824A, EDS-408A, EDS-510A, and EDS-405A industrial switches and edge devices contain multiple vulnerabilities including buffer overflow, cross-site request forgery (CSRF), weak session ID generation, authentication bypass, and weak cryptography. These flaws allow unauthenticated attackers to read sensitive configuration data, execute arbitrary commands, alter device settings, capture session data, cause device reboot or crash, or achieve full device compromise. Affected firmware versions: IKS-G6824A (≤5.6), EDS series (≤3.8).

What this means
What could happen
An attacker could remotely execute code on these industrial switches and network devices without authentication, potentially altering device configuration, capturing network traffic, stopping operations, or taking devices offline.
Who's at risk
Water utilities and municipal electric utilities that use Moxa industrial Ethernet switches and edge devices (IKS-G6824A, EDS-408A, EDS-510A, EDS-405A series) for plant network connectivity and remote monitoring. These are common in SCADA networks and RTU/PLC communication links.
How it could be exploited
An attacker on the network (or internet if the device is exposed) sends a crafted request to the web interface or network service of the affected device. Due to authentication bypass and input validation flaws, the attacker can inject code, alter settings, or crash the device without valid credentials.
Prerequisites
  • Network access to the device's web interface or network services (ports commonly 80/443 or Modbus TCP)
  • No valid credentials required
remotely exploitableno authentication requiredlow complexityno patch availableaffects network infrastructure in OT environmentshigh CVSS score (9.8)
Exploitability
Moderate exploit probability (EPSS 6.9%)
Affected products (4)
4 EOL
ProductAffected VersionsFix Status
EDS-408A series:≤ 3.8No fix (EOL)
EDS-510A series:≤ 3.8No fix (EOL)
EDS-405A series:≤ 3.8No fix (EOL)
IKS-G6824A series:≤ 5.6No fix (EOL)
Remediation & Mitigation
0/5
Do now
0/3
WORKAROUNDConfigure EDS series devices for HTTPS-only web access to reduce predictable session ID exploitation
HARDENINGPlace all Moxa switches and edge devices behind a firewall and isolate from internet and business network access
HARDENINGImplement network segmentation to restrict access to these devices to authorized engineering and operational staff only
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXRequest and install firmware patch from Moxa Customer Service (login required to obtain patch file)
Mitigations - no patch available
0/1
The following products have reached End of Life with no planned fix: EDS-408A series:, EDS-510A series:, EDS-405A series:, IKS-G6824A series:. Apply the following compensating controls:
HARDENINGUse VPN for any required remote access to these devices, and keep VPN software updated
View full CISA ICS-CERT advisory
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Moxa IKS, EDS (Update A) | CVSS 9.8 - OTPulse