Full Report
Vulnerabilities can lead to a denial-of-service condition and command execution without proper authentication
Analysis Summary
Based on the provided article summary regarding vulnerabilities in Siemens TIA Administrator, SIMATIC WinCC, and PCS 7, here is the technical summary:
# Vulnerability: RCE and DoS in Siemens TIA Administrator, SIMATIC WinCC, and PCS 7
## CVE Details
- **CVE ID:** CVE-2019-10915
- **CVSS Score:** 9.8 (Critical)
- **CWE:** CWE-20 (Improper Input Validation) / CWE-287 (Improper Authentication)
## Affected Systems
- **Products:** Siemens TIA Administrator, SIMATIC WinCC, and SIMATIC PCS 7.
- **Versions:**
- TIA Administrator: Versions prior to V1.0 SP2.
- SIMATIC WinCC: Specific versions integrated with TIA components.
- SIMATIC PCS 7: Specific versions using affected TIA components.
- **Configurations:** Systems where the TIA Administrator web server is enabled and accessible over the network.
## Vulnerability Description
The flaw exists due to improper validation of input and lack of robust authentication mechanisms within the TIA Administrator component. An attacker can send specially crafted HTTP requests to the affected device's web server. Because the application fails to properly authenticate these requests before processing, it allows for administrative-level actions to be performed by unauthenticated users.
## Exploitation
- **Status:** PoC available (Technically feasible, widely discussed in ICS security research circles).
- **Complexity:** Low
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Access to configuration and system data)
- **Integrity:** High (Unauthorized command execution)
- **Availability:** High (Potential for Denial-of-Service (DoS) and system crashes)
## Remediation
### Patches
- **TIA Administrator:** Update to **V1.0 SP2** or later.
- **SIMATIC WinCC / PCS 7:** Siemens recommends applying the latest General Station Description (GSD) files and software updates provided in the official Siemens portal for the respective product lines.
### Workarounds
- **Disable the Service:** If TIA Administrator is not required, disable the service to close the attack vector.
- **Network Segmentation:** Restrict access to the TIA Administrator web interface (typically port 8888) using firewalls to allow only trusted IP addresses.
- **Apply Defense-in-Depth:** Follow the Siemens operational guidelines for industrial security.
## Detection
- **Indicators of Compromise:** Unusual HTTP POST/GET requests directed at port 8888 or the TIA Administrator web service path originating from unauthorized internal or external IPs.
- **Detection methods and tools:**
- Monitor network traffic for unauthenticated access attempts to the TIA Administrator portal.
- Use ICS-aware IDS/IPS signatures specific to Siemens TIA portal protocols.
## References
- **Vendor Advisory:** hxxps[://]cert-portal[.]siemens[.]com/productcert/pdf/ssa-307392[.]pdf
- **Kaspersky ICS CERT:** hxxps[://]ics-cert[.]kaspersky[.]com/publications/reports/2019/07/16/dangerous-vulnerabilities-in-siemens-tia-administrator-simatic-wincc-and-pcs7/
- **NVD Entry:** hxxps[://]nvd[.]nist[.]gov/vuln/detail/CVE-2019-10915