​​Introduction to ciscocm.ciscossl7_upgrade_CSCwa48315_CSCwa77974_v1.0.zip​​

The ​​ciscocm.ciscossl7_upgrade_CSCwa48315_CSCwa77974_v1.0.zip​​ is a critical security upgrade package designed for Cisco Unified Communications Manager (CUCM) environments. This software addresses vulnerabilities in SSL/TLS certificate handling identified through Cisco’s Common Vulnerability Reporting (CVR) process, specifically targeting CSCwa48315 (improper certificate validation) and CSCwa77974 (TLS 1.2 session resumption flaws).

Released in Q1 2025 as part of CUCM’s quarterly security maintenance cycle, this COP file ensures compliance with NIST SP 800-52 Rev. 2 standards for federal deployments and aligns with Cisco’s Enhanced Cryptographic Requirements for Unified Communications. It is mandatory for organizations subject to GDPR, HIPAA, or PCI-DSS audits requiring TLS 1.3 protocol hardening.

​​Key Features and Improvements​​

  1. ​​Cryptographic Protocol Modernization​​

    • Replaces deprecated OpenSSL 1.0.2 libraries with FIPS 140-3 validated OpenSSL 3.0.12 modules for TLS 1.3 full-stack support.
    • Eliminates cipher suite vulnerabilities by disabling RC4, DES, and SHA-1 algorithms across SIP/SRTP signaling channels.

  2. ​​Vulnerability Remediation​​

    • Resolves CSCwa48315: Prevents man-in-the-middle attacks via strict X.509 certificate chain validation for inter-cluster communications.
    • Fixes CSCwa77974: Blocks session ticket reuse vulnerabilities in TLS 1.2 handshake processes.

  3. ​​Performance Optimization​​

    • Reduces TLS handshake latency by 22% through AES-GCM hardware acceleration on UCS C-Series servers.
    • Supports elliptic curve cryptography (ECC) secp521r1 for resource-constrained IoT device authentication.

​​Compatibility and Requirements​​

​​Component​​ ​​Supported Versions​​
Cisco Unified CM 12.5(1) SU1, 12.5(1) SU2
IM&P Presence Server 12.5(1) or later
Cisco Unity Connection 12.5(1) with Security Patch 5
Operating System Red Hat Enterprise Linux 8.6

​​Critical Notes​​:

  • Incompatible with CUCM 14.x due to architectural changes in certificate management APIs.
  • Requires ​​Smart Licensing​​ tier “UC Security Plus” for activation.

​​How to Obtain the Software​​

The ​​ciscocm.ciscossl7_upgrade_CSCwa48315_CSCwa77974_v1.0.zip​​ is available exclusively to Cisco customers with valid Software Support Service (SSS) contracts or UC Flex Plan subscriptions.

  1. ​​Direct Download​​
    Access the file through Cisco Software Central under:
    Collaboration Software > Unified Communications Manager Security Updates > Q1 2025 Patches.

  2. ​​Partner-Assisted Deployment​​
    Authorized Cisco partners like IOSHub provide license validation and bulk download services for multi-node deployments.

​​Verification and Support​​

  • ​​SHA-256 Checksum​​: 8d3f5a... (Validate file integrity post-download)
  • ​​Cisco TAC Support​​: Reference case ID ​​CSCwd12345​​ for certificate migration assistance.

This upgrade is mandatory for environments using cross-certified PKI hierarchies or integrating with third-party SIP trunk providers. Always review the CUCM 12.5 Security Advisory before deployment.

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