For more information regarding the security incident at F5, the actions we are taking to address it, and our ongoing efforts to protect our customers, click here.

Forum Discussion

JD1's avatar
JD1
Icon for Altostratus rankAltostratus
Dec 13, 2017
Solved

TMUI / Configuration WebUI - TLS/SSL Configuration - ECDHE

Hi All, I'm currently using BIG-IP 11.6.2 HF1. I'm required to secure the Management WebUI ciphers offered out. I'd prefer to drop all key exchange methods except for ECDHE. However, it seems...
BIG-IP
ecdhe
security
TMOS
tmui
  • nitass's avatar
    nitass
    Dec 21, 2017

    But the point being is that the command sys httpd ssl-ciphersuite on 11.6.x, doesn't seem to then correctly configure Apache services to use this for the TMUI.

     

    i understand this has been corrected in 12.0.

     

Ashwin_Venkat's avatar
Ashwin_Venkat
Icon for Employee rankEmployee
Dec 14, 2017

Hi JD,

 

It is possible to disable all cipher suites other than the ones using ECDHE by appending ':!kDH:!kEDH:!kRSA' (without the quotes) to your cipher string within httpd. That should disable all DH, EDH/DHE, RSA key exchange based cipher suites. We need to specify the 'k' when enabling/disabling a certain key exchange when you modify the string on httpd, as it's based on the openssl stack. When enabling/disabling them within the SSL profiles, you don't need to specify that, because that is natively built into TMM and you can simply specify ':!DHE:!DH:!RSA' (without the quotes) to disable those key exchange based cipher suites.

 

Please let me know if this answers your question.

 

JD1's avatar
JD1
Icon for Altostratus rankAltostratus
Dec 14, 2017

Hi Ashwin,

 

Thanks for the reply.

 

ECDHE needs to be there to begin with though, and isn't. It looks like 12.x does have it when I took it to lab. But I currently need it in 11.6.2.

 

As for SSL profiles, I'm not looking at/referring to SSL profiles as this is outside of TMM and is Apache via mod_ssl (configured via the sys httpd ssl-ciphersuites).

 

If there's anyway to enable ECDHE for Apache/Mod_SSL on 11.6.2, I'm all ears.

 

Thanks,

 

JD