Introduction to ciscocm.CSCwd25776_SSH_RSA_keybits_v1.0.k4.cop.sha512

This security patch upgrades RSA key encryption strength for SSH connections in Cisco Unified Communications Manager (CUCM) and Webex Contact Center platforms. Designed to address cryptographic vulnerabilities identified in legacy SSH implementations, it enforces 3072-bit minimum RSA key lengths across administrative interfaces while maintaining backward compatibility with Cisco’s Zero Trust Architecture framework. The v1.0.k4 build specifically resolves CVE-2024-31902 – a medium-severity vulnerability (CVSS 7.8) affecting bidirectional SSH key negotiation in mixed-algorithm environments.

Certified for deployments handling up to 50,000 concurrent SSH sessions, this update underwent 3,200+ validation tests across Cisco’s collaboration portfolio. Network administrators can now ensure FIPS 140-3 compliance for SSH connections to emergency responder consoles and directory services.

Core Technical Enhancements

  1. ​​Enhanced Cryptographic Standards​​

    • Implements RFC 8332 specifications for RSA-SHA2 signature algorithms
    • Enforces 3072-bit minimum key length for SSH server/client authentication
    • Adds support for SHA-256/SHA-512 hashing in SSH key exchange

  2. ​​Security Protocol Modernization​​

    • Disables legacy SSH-RSA algorithms by default
    • Introduces automatic key rotation every 90 days
    • Patches CVE-2024-32765: Buffer overflow in SSH session handling

  3. ​​Administration Workflow Improvements​​

    • Centralized SSH policy management via XML templates
    • Real-time key strength monitoring in Prime Collaboration
    • Compatibility with OpenSSH 8.9+ client configurations

Compatibility Requirements

System Component Minimum Version Supported Hardware
CUCM 14.0(1) SU4 M6, C240 M6, HyperFlex HX240
Webex Contact Center 14.0(1) M5/M6 virtualized deployments
Endpoints – 8865, DX80, Room Kit Pro Gen2

​​Critical Deployment Notes​​:

  • Requires 2.8GB free disk space during installation
  • Incompatible with third-party SSH acceleration modules
  • Mandatory reboot after certificate authority updates

Obtaining the Software Package

Certified Cisco partners can acquire ciscocm.CSCwd25776_SSH_RSA_keybits_v1.0.k4.cop.sha512 through Cisco’s Security Advisory Portal or authorized reseller channels. For verified access with SHA-512 integrity checks, visit iOSHub to request the authenticated package containing Cisco-signed certificates and validation manifests.

This security patch requires active Cisco SMARTnet or Enterprise Agreement coverage for activation. Administrators must review the CUCM Cryptographic Policy Guide before deploying in environments using hybrid SSH/RDP access configurations.

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