Full Report
SINEMA Remote Connect Client before V3.2 SP3 is affected by multiple vulnerabilities. Siemens has released a new version for SINEMA Remote Connect Client and recommends to update to the latest version.
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in SINEMA Remote Connect Client
## CVE Details
This advisory addresses six distinct vulnerabilities:
* **CVE-2024-1305**
* **CVSS Score:** 9.8 (Critical)
* **CWE:** CWE-190 (Integer Overflow or Wraparound)
* **CVE-2024-27903**
* **CVSS Score:** 9.8 (Critical)
* **CWE:** CWE-434 (Unrestricted Upload of File with Dangerous Type)
* **CVE-2024-27459**
* **CVSS Score:** 7.8 (High)
* **CWE:** CWE-121 (Stack-based Buffer Overflow)
* **CVE-2024-24974**
* **CVSS Score:** 7.5 (High)
* **CWE:** CWE-923 (Improper Restriction of Communication Channel)
* **CVE-2024-28882**
* **CVSS Score:** 6.5 (Medium)
* **CWE:** CWE-772 (Missing Release of Resource after Effective Lifetime)
* **CVE-2024-4877**
* **CVSS Score:** 4.9 (Medium) / 6.9 (Medium - CVSS v4.0)
* **CWE:** CWE-420 (Unprotected Alternate Channel)
## Affected Systems
* **Products:** SINEMA Remote Connect Client (OpenVPN-based management platform).
* **Versions:** All versions prior to V3.2 SP3.
* **Configurations:** Systems using the `tap-windows6` driver (v9.26 and earlier) and the OpenVPN interactive service.
## Vulnerability Description
The SINEMA Remote Connect Client incorporates OpenVPN components and drivers that contain several security flaws:
* **Driver Vulnerabilities:** The `tap-windows6` driver fails to validate data sizes in write operations, leading to integer overflows and potential kernel-space arbitrary code execution (**CVE-2024-1305**).
* **Service & Memory Flaws:** The "Interactive Service" is susceptible to stack-based buffer overflows (**CVE-2024-27459**) and improper restriction of communication channels, allowing remote access to the privileged service pipe (**CVE-2024-24974**).
* **Plugin & Impersonation:** Attackers can load arbitrary plugins from any directory (**CVE-2024-27903**) or use named pipe spoofing to impersonate users running the UI if they possess `SeImpersonatePrivilege` (**CVE-2024-4877**).
* **Session Persistence:** Authenticated clients can send multiple exit notifications to improperly extend session validity (**CVE-2024-28882**).
## Exploitation
* **Status:** Not reported as exploited in the wild; PoC availability not explicitly stated in the advisory.
* **Complexity:** Low (for most CVSS 3.1 vectors provided).
* **Attack Vector:** Primarily Network (CVE-2024-1305, 27903, 24974, 28882, 4877) and Local (CVE-2024-27459).
## Impact
* **Confidentiality:** High (Potential for full data access/exfiltration).
* **Integrity:** High (Potential for arbitrary code execution in kernel/privileged space).
* **Availability:** High (Potential for system crashes or resource exhaustion).
## Remediation
### Patches
* **Update to SINEMA Remote Connect Client V3.2 SP3** or later versions.
### Workarounds
* Siemens has not provided specific temporary workarounds. Users are advised to follow general security recommendations including:
* Protecting network access with appropriate mechanisms.
* Operating devices within protected IT environments.
## Detection
* **Indicators of Compromise:** Monitor for unusual named pipe creation, unauthorized plugin loading in OpenVPN directories, or unexpected kernel-level bug checks (BSOD).
* **Detection methods:** Audit versioning of `tap-windows6` drivers and SINEMA client installations.
## References
* Siemens Security Advisory SSA-615740: hxxps://cert-portal.siemens.com/productcert/pdf/ssa-615740.pdf
* Siemens Support Portal (Update Link): hxxps://support.industry.siemens.com/cs/ww/en/view/109976964/
* Siemens Industrial Security Guidelines: hxxps://www.siemens.com/cert/operational-guidelines-industrial-security