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Siemens Scalance W-7xx Product Family Multiple Vulnerabilities

Act NowICS-CERT ICSA-13-213-01May 4, 2013
Summary

Siemens Scalance W-7xx product family contains authentication bypass vulnerabilities (CWE-287) and improper resource validation (CWE-1392). An attacker can bypass authentication mechanisms or bypass other security protections on the wireless access points. No patches are available from Siemens for any affected product in this family.

What this means
What could happen
An attacker with network access to a Scalance W-7xx wireless access point could bypass authentication or modify device configuration without proper credentials, potentially gaining control over the industrial network segment the device manages.
Who's at risk
Operators of industrial networks using Siemens Scalance W-7xx wireless access points are affected, particularly those in manufacturing, water utilities, and power distribution who rely on these devices for wireless connectivity to field devices, RTUs, or HMIs. The W-7xx line is a legacy product family used for secure industrial wireless networking.
How it could be exploited
An attacker on the network (or remotely if the device is internet-facing) sends specially crafted requests to the Scalance W-7xx device. The device fails to properly validate credentials or check authentication, allowing the attacker to execute administrative actions like configuration changes or credential extraction without logging in.
Prerequisites
  • Network access to the Scalance W-7xx device (port 80/443 HTTP/HTTPS or management interface)
  • No valid credentials required for exploitation
No authentication requiredLow complexityHigh EPSS score (11.1%)No patch availableRemotely exploitable
Exploitability
High exploit probability (EPSS 11.1%)
Affected products (19)
19 pending
ProductAffected VersionsFix Status
SCALANCE: W744-1W744-1No fix yet
SCALANCE: W746-1W746-1No fix yet
SCALANCE: W747-1W747-1No fix yet
SCALANCE: W744-1PROW744-1PRONo fix yet
SCALANCE: W746-1PROW746-1PRONo fix yet
Remediation & Mitigation
0/5
Do now
0/3
HARDENINGImplement network segmentation to restrict access to Scalance W-7xx devices to authorized engineering and IT personnel only. Use firewall rules to limit traffic to management ports.
WORKAROUNDDisable remote management interfaces on Scalance W-7xx devices if not required for operations. Use local console-only management when possible.
HARDENINGEnable and enforce strong authentication on the Scalance W-7xx management interface. Change any default credentials and use complex passphrases.
Long-term hardening
0/2
HARDENINGMonitor Scalance W-7xx devices for unauthorized configuration changes or access attempts. Review logs regularly for suspicious activity.
HARDENINGContact Siemens to determine end-of-life status for your Scalance W-7xx models and plan replacement with current-generation products that receive security updates.
View full CISA ICS-CERT advisory
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