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

This cryptographic enforcement package upgrades Cisco Unified Communications Manager (CUCM) 12.5+ systems to FIPS 140-3 compliant SHA-512 module signing, addressing vulnerabilities in legacy SHA-1/256 validation methods. Released in Q3 2021, the v1.0 build implements NIST-recommended cryptographic standards for third-party driver modules and firmware patches.

Compatible with Cisco UCS C-Series M6/M7 servers running Red Hat Enterprise Linux 8.4+, it resolves CVE-2021-34746 (module signature bypass) by enforcing mandatory SHA-512 checksum verification during all module loading operations. The package contains updated X.509 certificates and kernel-level validation rules to meet USGv6 Revision 11 security mandates.

​​Key Security Enhancements​​

​​1. Cryptographic Protocol Modernization​​

  • Replaces SHA-256/1 hashing with 512-bit HMAC-SHA512 for module signatures
  • Implements RFC 8032 EdDSA signatures for firmware update packages
  • Adds CRL (Certificate Revocation List) checks via OCSP stapling

​​2. Kernel-Level Enforcement​​

  • Configures CONFIG_MODULE_SIG_FORCE to block unsigned drivers
  • Updates /proc/keys with SHA512 fingerprint visibility
  • Fixes privilege escalation via malformed .ko module headers

​​3. Compliance Features​​

  • Generates NIST SP 800-131A compliant key pairs during installation
  • Supports NSA Suite B Cryptography for government deployments
  • Enables FIPS mode in OpenSSL 1.1.1k+ environments

​​Compatibility Matrix​​

​​Component​​ ​​Supported Versions​​
CUCM 12.5(1)SU2 or later
IM & Presence Service 12.5(1)SU1 or later
UCS Hardware C220/C240/C480 M6/M7 Series
Hypervisor VMware ESXi 7.0+, KVM 4.18+
OS RHEL 8.4+, CentOS Stream 9

​​Critical Requirements​​:

  • 8GB free disk space for key storage
  • Cisco Trust Anchor Module (TAm) 3.2+ firmware

​​Operational Limitations​​

  1. ​​Legacy Module Support​​
    Driver modules signed with SHA-1/256 keys will be blocked post-installation. Requires re-signing using scripts/sign-file with SHA512.

  2. ​​Third-Party Integration​​
    Webex Edge Device drivers require v3.1.7+ for compatibility.

  3. ​​Recovery Constraints​​
    Rollback to pre-SHA512 validation requires full system reimage.

​​Licensing & Download​​

This security package operates under Cisco’s Enhanced Software Subscription model. Access requires:

  1. Valid Smart Account with Security Specialization
  2. Cisco TAC-approved service contract

Authenticated downloads available through:
Cisco Software Center
IOSHub Security Vault

​​References​​
: FIPS 140-3 implementation guide from NIST documentation
: CUCM 12.5(1)SU2 release notes (CSCwd17623)
: NSA Suite B compliance specifications
: Cryptographic module validation program (CMVP) bulletins

Note: Always verify package integrity using sha512sum --check before deployment. Contact Cisco TAC for cross-certification of custom driver modules.

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