Introduction to SUB105.part08.rar Software

SUB105.part08.rar is the eighth segment of a 10-part RAR archive containing critical security updates for Cisco Unified Communications Manager (CUCM) 12.5(3)SU2 systems. Released on May 9, 2025 under Cisco’s Extended Security Maintenance program, this package addresses 18 CVEs identified in Cisco Security Advisory cisco-sa-20250415-ucm (CVSS 7.8-9.1).

As part of the CUCM Security Patch PUB105 series, this file enables administrators to deploy vulnerability mitigations across distributed voice clusters while maintaining backward compatibility with CUCM 11.5(1)SU6+ deployments. The bundle requires sequential installation from part01.rar to part10.rar for complete functionality.

Key Features and Improvements

​​1. Security Hardening​​

  • Mitigated CVE-2025-33521: Remote code execution via SIP INVITE flooding
  • Patched CVE-2025-33545: Cross-site scripting in CUCM Admin Portal
  • Implemented TLS 1.3 encryption for configuration file transfers

​​2. Protocol Optimization​​

  • 30% faster SIP registration times (2.4s → 1.7s average)
  • Enhanced G.722.1 Annex C codec interoperability with Cisco VG450 gateways
  • Fixed DTMF relay conflicts in mixed SCCP/SIP environments

​​3. Management Enhancements​​

  • 45% reduction in XML configuration file size (4.2MB → 2.3MB)
  • SNMPv3 traps for cluster health monitoring
  • Web interface certificate chain validation via OCSP stapling

​​4. Legacy System Support​​

  • Maintained compatibility with CUCM 11.5(1)SU6+ clusters
  • Extended lifecycle support for 8845/8865 IP Phones
  • Preserved SCCP v8.x protocol stack for hybrid deployments

Compatibility and Requirements

​​Component​​ ​​Supported Versions​​
CUCM Clusters 11.5(1)SU6 – 12.5(3)SU2
IP Phone Models 8845, 8865, 8865NR, 8865WI
Operating Systems Windows Server 2022
RHEL 8.6 (CUCM-integrated)
Security Protocols TLS 1.2/1.3, SRTP-AES-256

​​Release Date​​: May 9, 2025

​​Critical Notes​​:

  • Sequential installation of PUB105.part01-10.rar required
  • Incompatible with CUCM 14.0+ cloud-native deployments
  • Minimum 25GB storage required on publisher nodes

Limitations and Restrictions

  1. ​​Deployment Sequence​​
    Installation must follow numerical order from part01.rar to part10.rar

  2. ​​Storage Constraints​​
    Requires 25GB free space per node during patch application

  3. ​​Rollback Complexity​​
    Partial removal requires full cluster reboot

  4. ​​Protocol Limitations​​
    SIP feature parity restricted to CUCM 12.0+ systems

Verified Distribution Channel

This security bundle is available through Cisco’s Software Download Center for active service contract holders. Organizations requiring immediate access can obtain validated packages via ​​authorized distribution partners​​ with:

  • FIPS 180-4 compliant SHA-512 checksum verification
  • PGP/GPG signature authentication (Key ID: 0x8F3A5B2C)
  • 24/7 technical support including:
    • Cluster health pre-audits
    • Multi-node provisioning scripts
    • Post-deployment validation tools

Important: Always validate cryptographic signatures using Cisco’s verify /sha512 command before deployment. Requires CUCM 12.5(3)SU2 Base Installation Kit for full functionality.

: Cisco Unified Communications Manager Security Advisory cisco-sa-20250415-ucm
: RAR file handling best practices from Cisco TAC documentation
: Multi-part archive deployment guidelines from CSDN technical blogs

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