Full Report
PowerSys before V3.11 is affected by a vulnerability that could allow a local attacker to bypass authentication, thereby gaining administrative privileges for the managed remote devices. Siemens has released a new version for PowerSys and recommends to update to the latest version.
Analysis Summary
# Vulnerability: Authentication Bypass in PowerSys Leading to Administrative Privilege Escalation
## CVE Details
- CVE ID: CVE-2024-36266
- CVSS Score: 9.3 (High) on v3.1; 8.5 (Critical) on v4.0
- CWE: CWE-287: Improper Authentication
## Affected Systems
- Products: PowerSys
- Versions: All versions prior to V3.11
- Configurations: Applicable to local attacks against the system.
## Vulnerability Description
The vulnerability lies in the application's insufficient protection of responses to authentication requests. A local attacker who gains access to the system can exploit this flaw to bypass the existing authentication mechanism, thereby gaining administrative privileges over the managed remote devices that PowerSys controls (such as PowerLink 50/100 or SWT 3000 devices).
The CVSS v3.1 vector is `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`.
## Exploitation
- Status: Exploitation status (in the wild/PoC) is not specified in the advisory, but the high severity suggests caution.
- Complexity: Low (AC:L) for a local attacker.
- Attack Vector: Local (AV:L). The attacker must have local access to the vulnerable system.
## Impact
- Confidentiality: High (C:H) - Loss of confidentiality for managed devices.
- Integrity: High (I:H) - Ability to modify configurations or data on managed devices.
- Availability: High (A:H) - Potential for denial of service or disruption of managed devices.
## Remediation
### Patches
- Update to **PowerSys V3.11 or later version**.
### Workarounds
- **General Security Recommendations:**
- Protect network access using firewalls, segmentation, and VPNs, according to operational guidelines.
- Ensure the environment is configured according to recommended security guidelines found at hxxps://www.siemens.com/gridsecurity.
- For critical power systems, ensure multi-level redundant secondary protection schemes are in place to minimize grid reliability risk from cyber incidents.
- Follow product-specific remediations if provided in the vendor advisory.
## Detection
- **Indicators of Compromise:** Not explicitly specified, but unauthorized administrative access to remote devices managed by PowerSys should be investigated.
- **Detection methods and tools:** Monitor local system access and authentication logs for anomalies related to the PowerSys service, particularly failures or unexpected privileged actions following local sessions.
## References
- Vendor Advisory: SSA-024584
- Siemens download link for updates: hxxps://support.industry.siemens.com/cs/ww/en/view/109963280/
- General Security Guidelines: hxxps://www.siemens.com/gridsecurity