Full Report
The CPCI85 firmware of SICAM A8000 CP-8031 and CP-8050 is affected by unauthenticated command injection vulnerability. This could allow an attacker to perfom remote code execution. Siemens has released updates for the affected products and recommends to update to the latest versions.
Analysis Summary
# Vulnerability: Unauthenticated Command Injection in Siemens SICAM A8000
## CVE Details
- **CVE ID:** CVE-2023-28489
- **CVSS Score:** 9.8 (Critical)
- **CVSS Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- **CWE:** CWE-77 (Improper Neutralization of Special Elements used in a Command)
## Affected Systems
- **Products:**
- CP-8031 MASTER MODULE (6MF2803-1AA00)
- CP-8050 MASTER MODULE (6MF2805-0AA00)
- **Versions:** All firmware versions prior to CPCI85 V05
- **Configurations:** The vulnerability is exploitable only when the **“Remote Operation”** parameter is enabled. This parameter is disabled by default.
## Vulnerability Description
The CPCI85 firmware contains a flaw where the web server, listening on port 443/tcp, fails to properly neutralize special elements in input parameters. Successful exploitation of this command injection vulnerability allows a remote, unauthenticated attacker to execute arbitrary OS commands on the underlying system with the privileges of the web server.
## Exploitation
- **Status:** PoC available (Note: CVSS exploitability code "E:P" indicates a Proof-of-Concept exists).
- **Complexity:** Low
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Total compromise of device data)
- **Integrity:** High (Total modification of device configuration/firmware)
- **Availability:** High (Total denial of service or device takeover)
## Remediation
### Patches
Siemens recommends upgrading the affected master modules to the following version:
- **CPCI85 V05 or later:** hxxps://support.industry.siemens.com/cs/ww/en/view/109804985/
### Workarounds
- **Disable Remote Operation:** Ensure the "Remote Operation" parameter remains disabled if not required.
- **Port Filtering:** Use an external firewall to restrict unauthorized access to ports 80/TCP and 443/TCP.
- **Network Segmentation:** Isolate the RTUs within a protected industrial network environment (e.g., via VPN or VLANs).
## Detection
- **Indicators of Compromise:** Monitor web server logs for suspicious characters in HTTP requests (e.g., `;`, `&`, `|`, `` ` ``) targeting port 443/tcp.
- **Detection methods and tools:** Use Intrusion Detection Systems (IDS) with signatures specifically designed to identify out-of-band command injection sequences in HTTPS traffic.
## References
- **Vendor Advisory:** hxxps://cert-portal.siemens.com/productcert/html/ssa-472454.html
- **Siemens Grid Security Guidelines:** hxxps://www.siemens.com/gridsecurity
- **Siemens ProductCERT:** hxxps://www.siemens.com/cert/advisories