Full Report
CISA has warned US federal agencies to secure their systems against attacks exploiting vulnerabilities in Cisco and Windows systems. [...]
Analysis Summary
# Vulnerability: Actively Exploited Vulnerabilities in Cisco and Microsoft Windows
## CVE Details
- CVE ID: CVE-2023-20025
- CVSS Score: N/A (Context implies high severity due to active exploitation; actual score not provided)
- CWE: Authentication Bypass (Implied by description)
- CVE ID: CVE-2018-8639
- CVSS Score: N/A (Context implies high severity due to active exploitation; actual score not provided)
- CWE: Elevation of Privilege (Win32k)
## Affected Systems
- **Products:** Cisco SBR (Specific product not fully detailed, but the advisory link references "sbr042"), Microsoft Windows (client and server platforms)
- **Versions:** (For CVE-2023-20025) Specific vulnerable versions are not listed, only that an advisory was published in Jan 2023 and updated in Jan 2024.
(For CVE-2018-8639) Client (Windows 7 or later) and Server (Windows Server 2008 and up).
- **Configurations:**
- **CVE-2023-20025:** Exploitation is contingent on chaining with other issues to achieve root privileges, potentially bypassing authentication.
- **CVE-2018-8639:** Requires a local attacker already logged into the target system.
## Vulnerability Description
**CVE-2023-20025 (Cisco):** An authentication bypass vulnerability that, when chained with other flaws, can grant an attacker root privileges.
**CVE-2018-8639 (Windows):** A **Win32k elevation of privilege flaw**. A local attacker who has logged into the target system can exploit this bug to run arbitrary code in kernel mode, resulting in the ability to alter data or create rogue accounts with full user rights, effectively taking over the device.
## Exploitation
- **Status:** Exploited in the wild (Tagged by CISA in the KEV catalog)
- **Complexity:** Low (for CVE-2018-8639, as it requires local access) / Medium (for CVE-2023-20025, due to chaining requirement)
- **Attack Vector:**
- CVE-2023-20025: Details not specified but likely network.
- CVE-2018-8639: Local.
## Impact
| Vulnerability | Confidentiality | Integrity | Availability |
| :--- | :--- | :--- | :--- |
| CVE-2023-20025 | High (Root access allows full compromise) | High (Root access allows full compromise) | High (Root access allows full compromise) |
| CVE-2018-8639 | High (Kernel mode code execution, rogue accounts) | High (Kernel mode code execution, data alteration) | High (System takeover) |
## Remediation
### Patches
- **CVE-2023-20025:** Vendor advising patch release. (Note: Microsoft and Cisco advisories were **not yet updated** at the time of reporting following CISA addition.)
- **CVE-2018-8639:** Microsoft released updates in December 2018. Users must apply relevant cumulative updates.
### Workarounds
- The article does not list specific workarounds, only the mandate for immediate patching by FCEB agencies.
## Detection
- **Indicators of Compromise:** Not specified in the provided excerpt.
- **Detection methods and tools:** CISA mandate requires agencies to address all KEV entries. Detection would focus on identifying exploitation attempts targeting the Win32k EoP path or unauthorized privilege escalation/root access attempts within Cisco SBR instances.
## References
- Vendor advisory for CVE-2023-20025: hxxps://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sbr042-multi-vuln-ej76Pke5
- Vendor advisory for CVE-2018-8639: hxxps://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2018-8639
- CISA KEV Catalog Addition: hxxps://www.cisa.gov/news-events/alerts/2025/03/03/cisa-adds-five-known-exploited-vulnerabilities-catalog
- CISA KEV Catalog: hxxps://www.cisa.gov/known-exploited-vulnerabilities-catalog