OTPulse

ICSA-18-018-01A Siemens SIMATIC WinCC Add-On (Update A)

Plan PatchCVSS 9.8ICS-CERT ICSA-18-018-01AJan 18, 2018
SiemensTransportation
Attack path
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

Multiple SIMATIC WinCC Add-on modules are vulnerable to buffer overflow in the License Manager component. The vulnerability exists in modules including Historian CONNECT ALARM, PI CONNECT series, and the PM-series (PM-AGENT, PM-ANALYZE, PM-CONTROL, PM-MAINT, and PM-OPEN variants), as well as SICEMENT and SIPAPER IT MIS modules. A remote attacker can send a malformed packet to trigger a buffer overflow and execute arbitrary code with application privileges. The License Manager service typically listens on port 4410. Affected versions include all instances of the listed modules up to the specified version numbers. Siemens has not provided firmware patches for these products but recommends updating the underlying License Manager software.

What this means
What could happen
Buffer overflow vulnerability in SIMATIC WinCC Add-on License Manager allows remote attackers to execute arbitrary code without authentication on the WinCC server, potentially compromising plant control systems and operations.
Who's at risk
Transportation authorities and any organizations operating Siemens SIMATIC WinCC systems with the listed Add-on modules (Historian, PM-series, and audit modules). This affects supervisory control stations that use these monitoring, data collection, and licensing add-ons.
How it could be exploited
An attacker on the network sends a specially crafted packet to the License Manager service (port 4410 by default) running on the WinCC server. The packet triggers a buffer overflow in memory handling, allowing the attacker to execute arbitrary commands with WinCC application privileges.
Prerequisites
  • Network access to WinCC License Manager service (typically port 4410)
  • No authentication required
  • Affected WinCC Add-on versions must be installed and active
remotely exploitableno authentication requiredlow complexityhigh CVSS (9.8)buffer overflow memory corruptionno patch available for most products
Exploitability
Some exploitation risk — EPSS score 8.3%
Affected products (16)
16 EOL
ProductAffected VersionsFix Status
SIMATIC WinCC Add-On Historian CONNECT ALARM≤ V5.xNo fix (EOL)
SIMATIC WinCC Add-On PI CONNECT ALARM≤ V2.xNo fix (EOL)
SIMATIC WinCC Add-On PM-AGENT≤ V5.xNo fix (EOL)
SIMATIC WinCC Add-On PM-ANALYZE≤ V7.xNo fix (EOL)
SIMATIC WinCC Add-On PM-CONTROL≤ V10.xNo fix (EOL)
Remediation & Mitigation
0/3
Do now
0/2
HOTFIXUpdate License Manager software to patched version from Gemalto support portal
WORKAROUNDIf License Manager patch is unavailable or cannot be deployed, restrict network access to WinCC License Manager service (port 4410) to trusted engineering networks only using firewall rules
Mitigations - no patch available
0/1
The following products have reached End of Life with no planned fix: SIMATIC WinCC Add-On Historian CONNECT ALARM, SIMATIC WinCC Add-On PI CONNECT ALARM, SIMATIC WinCC Add-On PM-AGENT, SIMATIC WinCC Add-On PM-ANALYZE, SIMATIC WinCC Add-On PM-CONTROL, SIMATIC WinCC Add-On PM-MAINT, SIMATIC WinCC Add-On PM-OPEN EXPORT, SIMATIC WinCC Add-On PM-OPEN IMPORT, SIMATIC WinCC Add-On PM-OPEN PI, SIMATIC WinCC Add-On PM-OPEN PV02, SIMATIC WinCC Add-On PM-OPEN TCP/IP, SIMATIC WinCC Add-On PM-QUALITY, SIMATIC WinCC Add-On SICEMENT IT MIS, SIMATIC WinCC Add-On PI CONNECT AUDIT TRAIL, SIMATIC WinCC Add-On PM-OPEN HOST-S, SIMATIC WinCC Add-On SIPAPER IT MIS. Apply the following compensating controls:
HARDENINGPlace WinCC servers on a segmented network separate from production control networks to limit attacker movement if compromise occurs
View full CISA ICS-CERT advisory
API: /api/v1/advisories/9a17c48c-5817-4f52-aad8-fc90934bc57a

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ICSA-18-018-01A Siemens SIMATIC WinCC Add-On (Update A) | CVSS 9.8 - OTPulse