How can I disable the encryption Cipher Block Chaining (CBC) for the server SSH on ACS 5.5.0.46?

Hi, a security audit found that the server SSH on our 5.5.0.46 ACS service is configured to support encryption of the network (CBC, Cipher Block Chaining) load balancing. This may allow a recovery attackerto the message plaintext to the ciphertext.

The Adviser is to enable the encryption mode cipher CTR or GCM - how is this possible? Is this something that you can run the command line?

Thank you.

Unfortunately at this time there is not a supported method to disable this option on ACS.

This issue is addressed by:

CSCup58251    Assessment Cisco Secure ACS CVE-2008-5161

https://Tools.Cisco.com/bugsearch/bug/CSCup58251/?reffering_site=dumpcr

All versions of the ACS are affected.

This vulnerability is fixed at 5.7 ACS version which should be published between mid and end of may 2015

Tariq

Tags: Cisco Security

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