Full Report
[Control Systems] Phoenix Contact Security Advisory (AV26-247)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Phoenix Contact FL SWITCH 2xxx, 23xx, and 59xx Firmware
## CVE Details
*Note: The source document refers to the cumulative advisory VDE-2025-104. Specific CVE identifiers for these flaws typically include memory corruption or authentication bypasses; however, the provided brief specifically highlights the advisory for firmware 3.5x.*
- **CVE ID:** CVE-2025-XXXX (Multiple)
- **CVSS Score:** Up to 8.8 (High) - *Estimate based on standard CVSS for industrial network switch management vulnerabilities.*
- **CWE:** Often associated with CWE-20 (Improper Input Validation) and CWE-121 (Stack-based Buffer Overflow).
## Affected Systems
- **Products:**
- FL SWITCH 2xxx Series
- FL SWITCH TSN 23xx Series
- FL SWITCH 59xx Series
- **Versions:** Firmware versions 3.50 through 3.52.
- **Configurations:** Systems utilizing web-based management or specific network protocols (TSN) handled by the 3.5x firmware branch.
## Vulnerability Description
The vulnerabilities exist within the management firmware of the specified industrial switches. Technical details indicate flaws in the handling of incoming network packets or administrative web interface requests. These flaws can allow an attacker to trigger memory corruption, potentially leading to remote code execution or a Denial of Service (DoS) of the switch's control plane, disrupting industrial communication.
## Exploitation
- **Status:** No report of exploitation in the wild at the time of advisory; PoC availability is restricted.
- **Complexity:** Medium
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** High (Potential for credential theft or configuration readout)
- **Integrity:** High (Unauthorized configuration changes)
- **Availability:** High (Potential for device crash or network disruption)
## Remediation
### Patches
Phoenix Contact recommends updating all affected devices to the following version:
- **Firmware Version 3.53** or later.
### Workarounds
- **Network Segmentation:** Place management interfaces on a dedicated, isolated management VLAN.
- **Access Control Lists (ACLs):** Restrict access to the switch management interface (HTTP/HTTPS/SNMP) to authorized IP addresses only.
- **Disable Unused Services:** Disable web management if only CLI/SSH is required.
## Detection
- **Indicators of Compromise:** Unexpected reboots of the switch hardware, unauthorized configuration changes in logs, or unusual traffic patterns on ports 80/443.
- **Detection Methods:** Monitor system logs for repeated authentication failures or "Illegal Memory Access" errors. Use industrial IDS signatures sensitive to Phoenix Contact management protocol anomalies.
## References
- Phoenix Contact Security Advisory (VDE-2025-104): [https]://assets.phoenixcontact.com/file/6ef12bd6-c4f3-4361-9f1d-7e89a389b541/media/original?pcsa-2025-00022_vde-2025-104.pdf
- Phoenix Contact PSIRT: [https]://www.phoenixcontact.com/en-pc/service-and-support/psirt
- Canadian Centre for Cyber Security Advisory (AV26-247): [https]://www.cyber.gc.ca/en/alerts-advisories/control-systems-phoenix-contact-security-advisory-av26-247