Full Report
SINEMA Remote Connect Server before V3.2 SP3 is affected by multiple vulnerabilities. Siemens has released a new version for SINEMA Remote Connect Server and recommends to update to the latest version.
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in SINEMA Remote Connect Server
## CVE Details
- CVE ID: CVE-2024-5594, CVE-2024-28882
- **CVE-2024-5594 CVSS Score:** 5.4 (Medium) - Based on provided vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L)
- **CVE-2024-28882 CVSS Score:** 6.5 (Medium) - Based on provided vector (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N)
- CWE: CWE-117 (Improper Output Neutralization for Logs) for CVE-2024-5594; CWE-772 (Missing Release of Resource after Effective Lifetime) for CVE-2024-28882
## Affected Systems
- Products: SINEMA Remote Connect Server (The context implies the server component is affected, which utilizes OpenVPN technology mentioned later.)
- Versions: All versions **before V3.2 SP3**
- Configurations: Vulnerabilities appear related to the underlying OpenVPN implementation leveraged by the product.
## Vulnerability Description
The advisory covers two primary vulnerabilities:
1. **CVE-2024-5594 (Improper Output Neutralization for Logs - CWE-117):** A malicious OpenVPN peer can send non-printable characters to the control channel, resulting in generating garbage logs or causing high CPU load on the server.
2. **CVE-2024-28882 (Missing Resource Release - CWE-772):** OpenVPN versions (2.6.0 through 2.6.10) running in a server role incorrectly accept multiple exit notifications from authenticated clients. This causes the validity period of an otherwise closing session to be extended indefinitely or unexpectedly.
## Exploitation
- Status: Exploitability information is **Unknown/Under Review**. The advisory states E:U (Unknown Evaluation) in vectors, indicating no public confirmation of exploitation status or PoC availability.
- Complexity: **Low** complexity for both, given Network attack vectors and required credentials (PR:L for both).
- Attack Vector: **Network (AV:N)**, requiring authenticated access (PR:L) for exploitation.
## Impact
| Vulnerability | Confidentiality | Integrity | Availability |
| :--- | :--- | :--- | :--- |
| **CVE-2024-5594** | None (N) | Low (L) | Low (L) |
| **CVE-2024-28882** | None (N) | High (H) | None (N) |
*Note: Overall impact is driven by the combination, particularly the High Integrity impact of CVE-2024-28882.*
## Remediation
### Patches
- Update to **V3.2 SP3 or a later version** of SINEMA Remote Connect Server.
- Patch information source: https://support.industry.siemens.com/cs/ww/en/view/109976964/
### Workarounds
- Siemens recommends following the **General Security Recommendations**, which include:
1. Protecting network access to devices with appropriate mechanisms.
2. Configuring the environment according to Siemens' operational guidelines for Industrial Security.
3. Following recommendations in the product manuals.
## Detection
- Detection methods are not explicitly detailed, but mitigation focuses on network segmentation and access control.
- **Indicators of compromise (IOCs):** System logs showing unusual CPU spike activity coinciding with connection activity (related to CVE-2024-5594). Unexpectedly long session validity times reported by the server monitoring tools (related to CVE-2024-28882).
## References
- Vendor Advisories: SSA-073066
- Siemens ProductCERT Advisories: https://www.siemens.com/cert/advisories
- Siemens Security Guidelines: https://www.siemens.com/cert/operational-guidelines-industrial-security
- Siemens Security Information: https://www.siemens.com/industrialsecurity