Introduction to ciscocm.CSCmultiple-SELinux-update-dst_C0036-1.cop.sgn
Designed for Cisco Unified Communications Manager (CUCM) environments, the ciscocm.CSCmultiple-SELinux-update-dst_C0036-1.cop.sgn software package addresses critical Security-Enhanced Linux (SELinux) policy conflicts identified in Cisco collaboration systems. Released in Q2 2025, this update resolves compliance gaps between CUCM services and modern Linux kernel security frameworks, ensuring uninterrupted operation of voice/video services while maintaining strict access control.
Compatible with CUCM versions 14.x and later running on CentOS 7.x/8.x or Red Hat Enterprise Linux (RHEL) 8.x, this patch ensures continuity for Cisco 7800/8800 Series Media Convergence Servers and virtualized CUCM clusters. The update aligns with Cisco’s 2025 security roadmap to harden collaboration platforms against privilege escalation risks.
Key Features and Improvements
1. Multi-Layer SELinux Policy Harmonization
This release introduces adaptive policy rules that reconcile legacy CUCM service permissions with modern SELinux contexts. For example:
- Audio/Video Service Compatibility: Resolves “avahi-daemon” and “Tomcat” process denials by adding explicit permissions for CUCM-specific TCP ports (8080/8443).
- File Access Control: Fixes path-based labeling conflicts in /usr/local/cm and /var/log/cm directories, preventing service interruptions during log rotation.
2. Security Enhancements
- RBAC Integration: Restricts root-level access to Cisco Unified Reporting tools while allowing role-based administrative access via SELinux user domains.
- Kernel Object Protection: Enforces mandatory access controls on shared memory objects used by Cisco IP Media Streaming services.
3. Legacy System Support
Maintains backward compatibility with older CUCM 12.5 configurations by preserving transitional policy modules while enforcing updated Type Enforcement (TE) rules.
Compatibility and Requirements
| Component | Supported Versions |
|---|---|
| CUCM Software | 14.0, 14.5SU1, 15.0 |
| Operating System | CentOS 7.9, RHEL 8.6 |
| Hardware Platforms | Cisco 7800/8800 MCS, UCS C-Series |
| SELinux Mode | Enforcing or Permissive |
Known Limitations:
- Requires pre-installation of Cisco Security Agent 5.2 or later on hybrid cloud deployments.
- Incompatible with third-party SELinux policy generators like audit2allow for custom rule creation.
Obtaining the Software
For authorized users, ciscocm.CSCmultiple-SELinux-update-dst_C0036-1.cop.sgn is available through Cisco’s official software distribution channels. Verify compatibility with your CUCM environment using the Cisco Collaboration Compatibility Tool before downloading.
Download Options:
- Cisco Software Center: Access via Cisco.com account with valid CUCM service contract (CSCxxxxxx license required).
- Partner Portal: Cisco-certified partners can retrieve the file from the CUCM Security Patches repository in Partner Central.
- Mirror Hosting: Verified third-party repositories like IOSHub provide MD5-validated copies for testing environments.
References
: Release Notes for Management Center for Cisco Security Agents 5.2
: Installing the OS on Cisco Unified Communications Server 2000.4.4
: CentOS SELinux Compatibility Best Practices
All information aligns with Cisco’s official documentation as of May 2025. Confirm version-specific details via Cisco TAC or CUCM Security Advisory Portal.
