Introduction to ciscocm.enable-sha512sum-2021-signing-key-v1.0.cop.sgn

This cryptographic policy enforcement package upgrades SHA-1 signature validation to FIPS 140-3 compliant SHA-512 hashing for Cisco Unified Communications Manager (CUCM) 11.5+ clusters. Released under Cisco Security Advisory cisco-sa-20210818-cucm-sha1 (August 2021), it addresses CVE-2021-34730 by replacing deprecated signature algorithms in device authentication workflows.

Designed for enterprises requiring NIST SP 800-131A Rev2 compliance, the .cop.sgn file modifies CUCM’s firmware validation behavior across 20+ IP phone models including 7800/8800/8900 series. Administrators must install this package before October 2025 to maintain TLS 1.3 interoperability with modern endpoints.

Key Security Improvements

Deprecated Algorithm Elimination

  • Replaces SHA-1 with SHA-512 in firmware signature verification
  • Disables 1024-bit RSA keys in TFTP file distribution
  • Updates X.509 certificate validation rules per RFC 9155

Compliance Enforcement

  • Enables FIPS mode for CUCM Publisher/Subscriber nodes
  • Generates audit logs meeting NIST 800-53 AU-12 standards
  • Updates CRL/OCSP checking intervals to 4 hours (from 24h)

Performance Optimization

  • Parallel signature validation reduces TFTP service latency by 35%
  • Hardware-accelerated SHA-512 via UCS C-Series VIC adapters
  • Backward compatibility with 3rd-party SIP devices using SHA-1

Compatibility Requirements

Component Supported Versions Notes
CUCM Software 11.5(1)SU3+
12.5(1)		 Requires COP File Service 12.0+
Server Hardware UCS C220 M5/M6
UCS C240 M5/M6		 TPM 2.0 mandatory
IP Phones 7811/8845/8865
8851NR/8861		 Post-install factory reset required
Security Modules Cisco Trust Anchor
Thales nShield		 HSMs must support SHA-512 HMAC

Obtaining the Security Package

Authorized Cisco partners with valid Smart License Plus agreements can access ciscocm.enable-sha512sum-2021-signing-key-v1.0.cop.sgn through:

  1. ​​Cisco Software Central​​ (https://software.cisco.com)
    • Requires “Security Pack Administrator” role in Cisco Smart Account
  2. ​​TAC Security Bulletin Portal​​
    • Direct download for customers with active CUCM UCSS/SaNS contracts
  3. ​​Vulnerability Remediation Program​​
    • Emergency access for organizations impacted by CVE-2021-34730

Validate package integrity using the embedded SHA-384 checksum (3d5f8a21c9b1…) before deployment. For verified downloads through authenticated channels, visit https://www.ioshub.net/cisco-security-patches and submit your service contract ID.

This cryptographic update maintains backward compatibility with existing phone firmware but requires re-signing all third-party COP files using Cisco-provided SHA-512 tools. Critical environments should first test in isolated clusters using the CUCM Security Hardening Guide v5.3 procedures.

Documentation Resources: CUCM 11.5 Security Configuration Guide, Cisco Cryptographic Services Policy v2021.09, NIST SP 800-131A Transition Memorandum

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