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GE Reason S20 Ethernet Switch

Monitor6.1ICS-CERT ICSA-20-266-02Sep 22, 2020
Attack VectorNetwork
Auth RequiredNone
ComplexityHigh
User InteractionRequired
Summary

GE Reason S20 Ethernet Switch contains a cross-site scripting vulnerability (CWE-79) that allows unauthorized account manipulation and remote code execution. Affected versions: S2020 and S2024 firmware below 07A06. Exploitation requires user interaction but no valid credentials. Once exploited, an attacker could execute arbitrary code on the switch, affecting network availability and enabling lateral movement through control system networks.

What this means
What could happen
An attacker could manipulate user accounts and execute arbitrary code on the Ethernet switch, potentially disrupting network connectivity or enabling lateral movement to other systems in the electrical utility or water authority network.
Who's at risk
Energy sector operators managing GE S20 Ethernet switches in electrical utilities or distribution networks. This includes control room staff, network engineers, and field technicians who rely on the switch for SCADA network connectivity and device communication.
How it could be exploited
An attacker with network access to the S20 switch could exploit a cross-site scripting vulnerability (CWE-79) to manipulate accounts or inject malicious code. The attack requires user interaction (clicking a link or visiting a crafted page) and elevated network conditions, but could lead to remote code execution on the device once account access is gained.
Prerequisites
  • Network access to the S20 switch web interface
  • User interaction (victim must click malicious link or visit attacker-controlled page)
  • No credentials required for initial XSS exploitation
remotely exploitableno authentication required for XSSlow complexity attack vectorno patch available for all firmware versionscross-site scripting allows account manipulation
Exploitability
Low exploit probability (EPSS 0.2%)
Affected products (2)
2 with fix
ProductAffected VersionsFix Status
S2020: all< 07A0607A06
S2024: all< 07A0607A06
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict network access to the S20 switch management interface using firewall rules or access control lists; allow only authorized engineering workstations
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HOTFIXUpgrade S2020 and S2024 firmware to Version 07A06 or higher
HARDENINGFor remote access to the switch, require VPN connections and ensure VPN software is kept current
Long-term hardening
0/1
HARDENINGIsolate S20 switch management network from the corporate business network; use separate VLANs or air-gapped networks if operationally feasible
View full CISA ICS-CERT advisory
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