it is not advisable to modify the default ssl profile, however if we would really need to disable all weak ciphers and tlsv1 protocol globally for all virtual servers, please advise beside creating a custom profile, any other solutions which we can consider, beside manually updating all virtual servers one by one. Am I right to say that all weak ciphers are disabled by default for version 11.5.3? Also please advise which firmware version by default tlsv1 is already disabled?

The default cipher suite in 11.5.3 is already sufficient to comply with current PCI DSS 3.0 requirements. Leaving the paranoid security-guru suggestions aside, there's nothing wrong with using the DEFAULT of 11.5.3 today. Config related: Your only sensible option for applying a new global configuration is to create a new clientside SSL profile (i.e. clientssl_custom) which you will then re-use as the Parent Profile when creating you custom clientssl profiles.

None of the firmware versions specifically disable TLSv1.0 by default. As for modifying the default SSL profile, you're definitely correct that it isn't advisable, but certainly doable. An alternative would be to create a new client SSL profile and assign that as the parent (or explicit) SSL profile of each VIP. If that's untenable, and you're also not inclined to scripting, then modifying the default cipher string in the default SSL profile might not be a bad option after all. Take a look at the following for guidance on what's provided, by default, in client SSL profile ciphers per version: https://support.f5.com/kb/en-us/solutions/public/13000/100/sol13171.html?sr=51244991

how to disable all weak ciphers and tlsv1 in ltm11.5.3 globally

11 Replies

Hannes_Rapp
Nimbostratus
Feb 02, 2016
The default cipher suite in 11.5.3 is already sufficient to comply with current PCI DSS 3.0 requirements. Leaving the paranoid security-guru suggestions aside, there's nothing wrong with using the DEFAULT of 11.5.3 today.

Config related:

Your only sensible option for applying a new global configuration is to create a new clientside SSL profile (i.e. clientssl_custom) which you will then re-use as the
Parent Profile
when creating you custom clientssl profiles.
- Steve_Sander_31
  Nimbostratus
  Mar 30, 2017
  EAV
- Chase_Abbott
  Admin
  Mar 31, 2017
  And: https://devcentral.f5.com/articles/security-sidebar-improving-your-ssl-labs-test-grade
  
  But related for newer versions.
- Hannes_Rapp
  Nimbostratus
  Apr 02, 2017
  Updated answer. Enforcement date for 3.1 was postponed (now June 2018)
Hannes_Rapp_162
Nacreous
Feb 02, 2016
The default cipher suite in 11.5.3 is already sufficient to comply with current PCI DSS 3.0 requirements. Leaving the paranoid security-guru suggestions aside, there's nothing wrong with using the DEFAULT of 11.5.3 today.

Config related:

Your only sensible option for applying a new global configuration is to create a new clientside SSL profile (i.e. clientssl_custom) which you will then re-use as the
Parent Profile
when creating you custom clientssl profiles.
- Steve_Sander_31
  Nimbostratus
  Mar 30, 2017
  EAV
- Chase_Abbott
  Admin
  Mar 31, 2017
  And: https://devcentral.f5.com/s/articles/security-sidebar-improving-your-ssl-labs-test-grade
  ¬†
  
  But related for newer versions.
  ¬†
- Hannes_Rapp_162
  Nacreous
  Apr 02, 2017
  Updated answer. Enforcement date for 3.1 was postponed (now June 2018)
Kevin_Stewart
Employee
Feb 02, 2016
None of the firmware versions specifically disable TLSv1.0 by default. As for modifying the default SSL profile, you're definitely correct that it isn't advisable, but certainly doable. An alternative would be to create a new client SSL profile and assign that as the parent (or explicit) SSL profile of each VIP. If that's untenable, and you're also not inclined to scripting, then modifying the default cipher string in the default SSL profile might not be a bad option after all.

Take a look at the following for guidance on what's provided, by default, in client SSL profile ciphers per version:

https://support.f5.com/kb/en-us/solutions/public/13000/100/sol13171.html?sr=51244991