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Deprecated supported-ciphers field will not update

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Category:
ontap-9
Specialty:
CORE
Last Updated:

Applies to

  • ONTAP 9.8 and later
  • Clusters using security config for SSL/TLS cipher configuration
  • Environments where internal compliance tools check the deprecated supported-ciphers field

Issue

  • Attempts to update the SSL/TLS supported ciphers using the security config modify command (with the supported-ciphers  parameter) on an ONTAP 9.17.1 cluster do not result in the expected change to the displayed cipher list.
  • Instead of the compact OpenSSL expression (e.g., ALL:!LOW:!aNULL:!EXP:!eNULL:!3DES:!kDH:!kECDH), the supported-ciphers field displays an expanded list of ciphers, even after running the update command.

Example log/output:

On reference cluster (customer expected, compact form):

cluster1::*> security config show -interface SSL -fields supported-protocols,supported-ciphers

interface  supported-protocols   supported-ciphers

-----------------------------------------------------------

SSL        TLSv1.3,TLSv1.2       ALL:!LOW:!aNULL:!EXP:!eNULL:!3DES:!kDH:!kECDH

On affected cluster (unexpected, expanded form):

cluster2::*> security config show -interface SSL -fields supported-protocols,supported-ciphers

interface  supported-protocols   supported-ciphers

-----------------------------------------------------------------------------------------------------------------------------------

SSL        TLSv1.3,TLSv1.2       AES128-CCM:AES128-CCM8:AES128-GCM-SHA256:...:TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:...

  • Attempts to apply the compact string are accepted (command returns Success), but the display does not change.

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