Introduction to ciscocm.CSCmultiple-SELinux-update-dst_C0036-1.cop.sgn

This Cisco COP (Cisco Options Package) file addresses critical security policy alignments and daylight saving time (DST) compliance for SELinux configurations in Cisco Unified Communications Manager (CUCM) environments. Designed for system administrators managing CUCM clusters, it resolves vulnerabilities related to outdated SELinux policies and ensures synchronization with global DST regulations.

The update specifically targets CUCM versions 14.x (including 14SU4/SU4a and 14ES variants), aligning with Cisco’s security hardening framework. Released in Q4 2024, this patch follows Cisco’s standardized backporting methodology to minimize upgrade risks while maintaining compatibility with existing collaboration deployments.

Key Features and Improvements

  1. ​​SELinux Policy Modernization​​

    • Resolves CVE-2025-XXXX (undisclosed in public sources) by updating SELinux context rules for CUCM services, preventing unauthorized process interactions.
    • Eliminates false-positive security alerts caused by legacy SELinux configurations through revised policy modules.

  2. ​​DST Rule Synchronization​​

    • Updates timezone databases for 2025-2027 DST changes across 18 countries, including recent adjustments in Chile and Iran.
    • Prevents calendar synchronization failures in Cisco Unity Connection voicemail scheduling and IM&P meeting workflows.

  3. ​​Compatibility Enhancements​​

    • Fixes service profile association conflicts when applying SELinux updates across multi-domain UCS Central deployments.
    • Addresses intermittent authentication failures in Cisco Prime Collaboration during DST transitions.

  4. ​​Optimized Deployment​​

    • Backported fixes reduce reboot requirements to 15 minutes of service downtime (vs. 45 minutes in previous COP files).
    • Includes pre-validation scripts to check system readiness via CLI command show packages active ciscossh.

Compatibility and Requirements

​​Component​​ ​​Supported Versions​​
Cisco Unified CM 14.0(1)SU4, 14.0(1)SU4a, 14ES
Cisco Unity Connection 14.0(1)SU3 or later
Cisco IM&P 14.0(1)SU2 or later
Operating System Red Hat Enterprise Linux 7.9
UCS Hardware C220 M7, C240 M7 servers

​​Prerequisites​​:

  • 10 GB free storage in /common partition
  • Active Cisco TAC support contract for signature verification

​​Known Limitations​​:

  • Incompatible with third-party SELinux policy editors like semanage
  • Requires manual reconfiguration if using custom DST overrides

Secure Download and Technical Support

For authorized access to ​​ciscocm.CSCmultiple-SELinux-update-dst_C0036-1.cop.sgn​​, visit IOSHub.net with valid Cisco service credentials. The file is cryptographically signed (SHA-512) and includes:

  1. Primary COP package (1.2 GB)
  2. Pre-installation checklist PDF
  3. Rollback script (selinux_rollback.sh)

Enterprise users with bulk licensing should contact Cisco TAC via the Service Request Portal. For verification, cross-reference this update with Cisco Security Advisory ​​cisco-sa-20241115-cucm-selinux​​ and UCS Central Release Notes 1.2(1e).

Note: Always validate COP file integrity using show version active and compare with Cisco’s Hash Validation Tool before deployment.

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