Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Rohkem teavet

Teema arhiveeriti. Please ask a new question if you need help.

TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (DHE-RSA-AES256-GCM-SHA384) and TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 not work with Firefox 50.0

  • 5 vastust
  • 1 on selline probleem
  • 11 views
  • Viimati vastas davidfr

davidfr
davidfr
more options

Hello, First, thanks for Firefox and all you work ! Ciphers TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (DHE-RSA-AES256-GCM-SHA384) and TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (DHE-RSA-AES256-SHA256) not work with Firefox 50.0 and Firefox 53 Nithly. But they are in the wiki : https://wiki.mozilla.org/Security/Server_Side_TLS in "Intermediate compatibility (default)" Are they supported ? Thanks a lot. David

Hello, First, thanks for Firefox and all you work ! Ciphers TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (DHE-RSA-AES256-GCM-SHA384) and TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (DHE-RSA-AES256-SHA256) not work with Firefox 50.0 and Firefox 53 Nithly. But they are in the wiki : https://wiki.mozilla.org/Security/Server_Side_TLS in "Intermediate compatibility (default)" Are they supported ? Thanks a lot. David

All Replies (5)

John99
John99
more options

This is not something I understand & would need to research further, so if this reply does not help you get an answer by bumping the post I suggest you try in another Mozilla forum

If the subject is not on topic there hopefully they will be able to say where you can get an answer.

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

Note that your System Details list shows an old Firefox 35 version.

  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:35.0) Gecko/20100101 Firefox/35.0

You can see the supported ciphers as security.ssl3.* prefs on the about:config page.

davidfr
davidfr Küsimuse esitaja
more options

cor-el a écrit

Note that your System Details list shows an old Firefox 35 version.
  • User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:35.0) Gecko/20100101 Firefox/35.0
You can see the supported ciphers as security.ssl3.* prefs on the about:config page.

Hello ! Thanks for your reply. My useragent is fixed by an extention, so the version is false. I'm on firefox 50, my about:config juste have : security.ssl3.dhe_rsa_aes_128_sha : yes security.ssl3.dhe_rsa_aes_256_sha : yes not SHA384 or SHA256

Do you have it on you firefox version ?

Thanks a lot

Thanks John99, I will see it.

Have a good day

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

You need to set prefs that that are involved with the Logjam vulnerability to false to disable cipher suites in case they are currently enabled (true).

  • security.ssl3.dhe_rsa_aes_128_sha
  • security.ssl3.dhe_rsa_aes_256_sha

These shouldn't be enabled.

davidfr
davidfr Küsimuse esitaja
more options

cor-el a écrit

You need to set prefs that that are involved with the Logjam vulnerability to false to disable cipher suites in case they are currently enabled (true).
  • security.ssl3.dhe_rsa_aes_128_sha
  • security.ssl3.dhe_rsa_aes_256_sha
These shouldn't be enabled.

Thanks for your reply but my question is can we use (regardles of this security problem) TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 and TLS_DHE_RSA_WITH_AES_256_CBC_SHA256.

My servers are not vulnerable to Logjam and I want to use this. But it seam that firefox not support it. Do you have information on this point ?

What is you recommandation ? The use of ecdhe_rsa_aes_256_gcm_sha384 ?

Thanks