Full Report
SINEMA Remote Connect Server before V3.2 SP2 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: Session Management Flaw in SINEMA Remote Connect Server Leading to MFA Bypass
## CVE Details
- CVE ID: CVE-2024-42345
- CVSS Score: 4.3 (CVSS v3.1) / 5.3 (CVSS v4.0) (Low/Medium depending on version used)
- CWE: CWE-384: Session Fixation
## Affected Systems
- Products: SINEMA Remote Connect Server
- Versions: All versions **before V3.2 SP2**
- Configurations: N/A (General server application vulnerability)
## Vulnerability Description
The SINEMA Remote Connect Server does not properly handle the establishment and invalidation of user sessions. This vulnerability allows a remote attacker, provided they have necessary privileges (PR:L), to circumvent the requirement for Multi-Factor Authentication (MFA) during user session establishment.
## Exploitation
- Status: PoC available (Indicated by E:P in base vector: E:P - Proof of Concept)
- Complexity: Low (AC:L)
- Attack Vector: Network (AV:N)
## Impact
- Confidentiality: No impact (C:N)
- Integrity: Low Impact (I:L) - Successful exploitation could lead to unauthorized actions based on the bypassed MFA.
- Availability: No impact (A:N)
## Remediation
### Patches
- Update SINEMA Remote Connect Server to **V3.2 SP2 or a later version**.
- Siemens Link for update information: hXXps://support.industry.siemens.com/cs/ww/en/view/109974084/
### Workarounds
- Product-specific mitigations should be reviewed in the official Siemens advisory.
- Follow General Security Recommendations: Protect network access to devices with appropriate mechanisms and configure the environment according to Siemens' operational guidelines for Industrial Security.
## Detection
- Detection methods are not explicitly detailed in the summary, but monitoring for anomalous session establishment that bypasses expected authentication steps would be key.
- Indicators of Compromise (IOCs) related to successful MFA bypasses on the server should be investigated.
- Review general security logging for unauthorized access attempts post-login attempt.
## References
- Vendor Advisory: SSA-869574
- Siemens Industrial Security Operational Guidelines: hXXps://www.siemens.com/cert/operational-guidelines-industrial-security