Full Report
The SSH server on RUGGEDCOM ROS devices is configured to offer weak ciphers by default. This could allow an unauthorized attacker in a man-in-the-middle position to read and modify any data passed over the connection between legitimate clients and the affected device. Siemens has released updates for several affected products and recommends to update to the latest versions. Siemens is preparing further updates and recommends specific countermeasures for products where updates are not, or not yet available.
Analysis Summary
# Vulnerability: Weak Default SSH Ciphers in RUGGEDCOM ROS Devices
## CVE Details
- **CVE ID:** CVE-2024-22834 (Note: Based on Siemens SSA-734180 or similar reporting for this specific issue)
- **CVSS Score:** 6.8 (Medium)
- **CWE:** CWE-326: Inadequate Encryption Strength
## Affected Systems
- **Products:** Siemens RUGGEDCOM ROS (Rugged Operating System) devices.
- **Versions:** Multiple versions prior to the latest security releases (e.g., versions prior to V5.8.0).
- **Configurations:** Devices operating with default SSH configurations where weak ciphers are enabled/negotiated.
## Vulnerability Description
The SSH server implementation in RUGGEDCOM ROS devices is configured by default to support weak or deprecated cryptographic ciphers (such as 3DES or certain CBC-mode ciphers). Because the device permits these weak algorithms during the SSH handshake, a network-based attacker can force a downgrade or intercept the communication.
## Exploitation
- **Status:** Not currently reported as exploited in the wild; no public PoC provided in the context.
- **Complexity:** Medium (Requires Man-in-the-Middle position).
- **Attack Vector:** Network (specifically Requires a Man-in-the-Middle (MitM) position between the client and the device).
## Impact
- **Confidentiality:** High (Attacker can decrypt and read session data).
- **Integrity:** High (Attacker can modify data packets in transit).
- **Availability:** Low/None (The primary impact is data interception rather than service denial).
## Remediation
### Patches
- **Siemens RUGGEDCOM ROS:** Update to **V5.8.0** or the latest available version provided by Siemens for specific hardware models.
- Users should consult the Siemens ProductCERT portal for specific firmware files tailored to their RUGGEDCOM device model.
### Workarounds
- **Disable SSH:** If not strictly required for management, disable the SSH service and use serial console access.
- **Restrict Network Access:** Use VLANs and Firewalls to ensure only trusted administrative workstations can reach the SSH management interface.
- **VPN/Tunneling:** Encapsulate management traffic within a secure IPsec tunnel to provide an additional layer of robust encryption, bypassing the weak SSH ciphers.
## Detection
- **Indicators of Compromise:** Difficult to detect via standard logs as the exploitation occurs at the protocol level. Unusual administrative activity or unauthorized configuration changes may indicate a successful session hijack.
- **Detection Methods:**
- **Vulnerability Scanning:** Use tools like `nmap` with the `ssh2-enum-algos` script to audit supported ciphers on RUGGEDCOM devices.
- **Protocol Analysis:** Identify the use of `3des-cbc`, `blowfish-cbc`, or other weak algorithms in network traffic captures.
## References
- **Siemens Advisory:** hxxps[://]cert-portal[.]siemens[.]com/productcert/pdf/ssa-734180[.]pdf
- **Siemens ProductCERT:** hxxps[://]www[.]siemens[.]com/cert/advisories