Siemens Industrial Products OpenSSL Heartbleed Vulnerability (Update B)
Act NowICS-CERT ICSA-14-105-03BJan 16, 2014
Summary
Siemens industrial products use OpenSSL libraries vulnerable to the Heartbleed vulnerability (CVE-2014-0160). This is a critical flaw in OpenSSL that allows remote attackers to read arbitrary memory contents from vulnerable systems. Affected products include eLAN (when RIP is used), WinCC OA, S7-1500 PLC (when HTTPS is active), CP1543-1 communication module (when FTPS is active), and APE 2.0 (when SSL/TLS is used). The vulnerability is actively being exploited in the wild.
What this means
What could happen
An attacker with network access to any of these systems could read sensitive data from memory, including credentials, private keys, process data, and system secrets. This could lead to unauthorized access to your control systems and theft of sensitive operational information.
Who's at risk
This vulnerability affects water utilities, electric utilities, and manufacturing plants using Siemens control systems. Specific impacts depend on your equipment: S7-1500 PLCs used in process automation and safety systems are at risk if HTTPS is enabled; CP1543-1 industrial Ethernet modules are at risk if FTPS is in use; WinCC OA human-machine interfaces are at risk if used for system monitoring; eLAN switches are at risk if RIP routing protocol is enabled; and APE automation platforms are affected if SSL/TLS components are deployed.
How it could be exploited
An attacker sends specially crafted heartbeat requests to the vulnerable OpenSSL service (typically HTTPS on S7-1500, FTPS on CP1543-1, or RIP on eLAN) without requiring authentication. The vulnerable system responds by leaking up to 64 KB of its memory, which may contain credentials, encryption keys, or process data. This can be repeated to extract large amounts of sensitive information.
Prerequisites
- Network access to the vulnerable service port (HTTPS for S7-1500, FTPS for CP1543-1, RIP for eLAN)
- The vulnerable SSL/TLS component must be enabled and in use
- No authentication required to exploit
actively exploited (KEV)remotely exploitableno authentication requiredhigh EPSS score (94.5%)no patch availableaffects safety systems (S7-1500)
Exploitability
Actively exploited — confirmed by CISA KEV
Affected products (5)
5 EOL
ProductAffected VersionsFix Status
WinCC OA only: V3.12V3.12No fix (EOL)
S7-1500 (when HTTPS active): V1.5V1.5No fix (EOL)
CP1543-1 (when FTPS active): V1.1V1.1No fix (EOL)
APE 2.0 (when SSL/TLS component is used in customer implementation): vers:all/*All versionsNo fix (EOL)
eLAN-8.2 eLAN (when RIP is used): <8.3.3<8.3.3No fix (EOL)
Remediation & Mitigation
0/5
Do now
0/3WORKAROUNDImmediately isolate affected systems from untrusted networks and restrict network access to only authorized engineering workstations and control system traffic
WORKAROUNDIf possible, disable SSL/TLS services on affected devices (e.g., disable HTTPS on S7-1500, FTPS on CP1543-1, RIP on eLAN) and use alternative unencrypted communication only if the environment is already protected by network segmentation
HARDENINGDeploy network segmentation and firewall rules to prevent external access to affected systems; restrict inbound connections to SSL/TLS ports to only known trusted IP addresses
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HARDENINGReset all credentials and encryption keys on affected systems after mitigation, as they may have been compromised
HOTFIXContact Siemens for guidance on firmware updates or replacement for affected products, as no official patches are available
CVEs (1)
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