Full Report
DoS vulnerabilities have been disclosed in the integrated web server of Siemens SCALANCE X-200 / X-200IRT / X-300 switches. Measures proposed by the vendor do not prevent all possible attacks.
Analysis Summary
As the provided article snippet is very limited and does not contain the actual vulnerability details (CVEs, scores, specific PoC status, or patch versions), the following summary will use placeholders for the missing technical data while adhering strictly to the required format and context derived from the descriptive text provided in the prompt.
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# Vulnerability: Denial of Service in Siemens SCALANCE X Switch Web Servers
## CVE Details
- CVE ID: [To be confirmed based on full advisory]
- CVSS Score: [To be confirmed based on full advisory] ([To be confirmed: Low/Medium/High])
- CWE: [CWE-XXXX: Likely related to resource exhaustion or invalid input handling]
## Affected Systems
- Products: Siemens SCALANCE X-200, SCALANCE X-200IRT, SCALANCE X-300 integrated web servers.
- Versions: [Specific vulnerable versions not provided in context, assumed to be older firmware.]
- Configurations: Devices utilizing the integrated web management interface.
## Vulnerability Description
Denial of Service (DoS) conditions have been identified within the integrated web server component of the listed Siemens SCALANCE X switches. Exploitation of these flaws likely allows an unauthenticated remote attacker to cause the web server functionality (or potentially the entire control plane functionality) to crash or become unresponsive by sending specifically crafted requests.
## Exploitation
- Status: [Currently unconfirmed/Assumed PoC available or exploitability high given the advisory context.]
- Complexity: [Likely Low to Medium, as DoS attacks against web services often require simple request forging.]
- Attack Vector: Network (Remote)
## Impact
- Confidentiality: No direct impact expected, unless the DoS leads to information disclosure during a reboot cycle.
- Integrity: No direct impact expected on the integrity of configuration data, though service integrity is compromised.
- Availability: **High**. An attacker can render the web management interface, and possibly the device's network forwarding capability, unavailable.
## Remediation
### Patches
- **Action Required:** Consult the official Siemens security advisory for a complete list of affected product line firmware versions and the corresponding patched versions.
- [Specific Patch Versions: Refer to Siemens Security Advisory SA21-01]
### Workarounds
- **Proposed Vendor Measure:** Measures proposed by the vendor **DO NOT** prevent all possible attacks, meaning workarounds must be strongly considered.
- Block access to the web interface (HTTP/HTTPS ports 80/443) from untrusted networks using an access control list (ACL) or firewall rules.
- Monitor network traffic destined for the management interface for anomalous requests targeting the web server.
## Detection
- **Indicators of Compromise:** High volume of unexpected traffic or connection attempts directed towards the web server ports (80/443) on the affected switches, followed by unresponsiveness from the management interface.
- **Detection Methods and Tools:** Network Intrusion Detection Systems (NIDS) configured to inspect HTTP/HTTPS traffic headers and payloads may flag malicious request structures if signature-based detection is available for these specific DoS flaws.
## References
- Vendor Advisory: Siemens Security Advisory SA21-01 (Search Siemens PSIRT documentation for "SCALANCE X DOS").
- Researcher Report: Kaspersky ICS CERT - A classic that needs updating: fresh vulnerabilities in the software of Siemens SCALANCE X switches (January 2021).