Full Report
A denial of service vulnerability could allow an unauthorized attacker to cause total loss of availability in the web server of the affected devices. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.
Analysis Summary
# Vulnerability: Denial of Service in RUGGEDCOM ROS Web Server
## CVE Details
- CVE ID: CVE-2023-39269
- CVSS Score: 7.5 (High)
- CWE: CWE-770: Allocation of Resources Without Limits or Throttling
## Affected Systems
- Products: RUGGEDCOM M969F, RUGGEDCOM M2100F, RUGGEDCOM M2200F, RUGGEDCOM ROS V4.X family, RUGGEDCOM i800, RUGGEDCOM ROS V4.X NC products, RUGGEDCOM i800NC, RUGGEDCOM i801NC, RUGGEDCOM i802NC, RUGGEDCOM i803NC, RUGGEDCOM M2100NC, RUGGEDCOM RS416NCv2, RUGGEDCOM RS416PNCv2, RUGGEDCOM RS416v2, RUGGEDCOM RS416Pv2, RUGGEDCOM RSG2100P (32M), RUGGEDCOM RSG2100PNC (32M).
- Versions:
- RUGGEDCOM i800, i800NC, i801NC, i802NC, i803NC, M2100NC: All versions prior to V4.3.8.
- Other listed products: Specific affected versions vary (check advisory for V4.x and V5.x details).
- Configurations: Affects devices utilizing the affected web server component.
## Vulnerability Description
The web server component in the affected Siemens RUGGEDCOM devices contains a design flaw related to resource allocation without proper limits or throttling (CWE-770). This flaw can be exploited by an unauthenticated attacker to send specific requests that exhaust server resources, leading to a denial of service condition, resulting in the total loss of availability for the web server. The server might recover after the attack concludes.
## Exploitation
- Status: Not explicitly stated as exploited in the wild, but PoC details are not provided in the summary text. (Assumed: Vulnerable to remote attack given AV:N/PR:N/UI:N)
- Complexity: Low (AC:L)
- Attack Vector: Network (AV:N)
## Impact
- Confidentiality: No Impact (N)
- Integrity: No Impact (N)
- Availability: High Impact (H) - Total loss of web server availability.
## Remediation
### Patches
Siemens has released updates for several affected product lines. Specific fixes mentioned:
- **RUGGEDCOM i800, i800NC, i801NC, i802NC, i803NC, M2100NC:** Update to version **V4.3.8 or later**.
- Siemens recommends updating to the latest available versions for all affected products where fixes are available (check vendor advisory for specific V5.X updates).
### Workarounds
For products where fixes are not yet available (e.g., RUGGEDCOM M969F, M2100F, M2200F):
1. Configure the environment according to Siemens' operational guidelines for Industrial Security.
2. Follow the recommendations provided in the product manuals.
3. Restrict access to the affected devices within a protected IT environment.
## Detection
- Indicators of compromise: Unexplained total unavailability of the web server interface on the affected RUGGEDCOM devices.
- Detection methods and tools: Monitor network traffic directed at the web interface (HTTP/HTTPS ports) for potentially malicious or abnormally high request volumes originating from unauthorized sources. Network or endpoint security monitoring tools should look for resource exhaustion signatures related to web services.
## References
- Vendor Advisory: SSA-770902
- Operational Guidelines: hxxps://www.siemens.com/cert/operational-guidelines-industrial-security
- Siemens Security Pages: hxxps://www.siemens.com/industrialsecurity
- Product specific fix link (example): hxxps://support.industry.siemens.com/cs/ww/en/view/109816735/