DH Group Exchange Fallback

[Tim Broberg]

Do I understand correctly, that you find the security of group 14 unacceptable and yet you left it enabled?

On 9/22/17, 2:01 PM, "openssh-unix-dev on behalf of Joseph S Testa II" <openssh-unix-dev-bounces+tim.broberg=servicenow.com at mindrot.org on behalf of jtesta at positronsecurity.com> wrote:

    On 09/22/2017 03:22 PM, Daniel Kahn Gillmor wrote:
    > On Thu 2017-09-21 18:12:44 -0400, Joseph S Testa II wrote:
    >>      I gotta say... having a fallback mechanism here seems pretty
    >> strange.  The entire point of the group exchange is to use a dynamic
    >> group and not a static one.
    > 
    > fwiw, i think dynamic groups for DHE key exchange is intrinsically
    > problematic when there is any computational expense in validating the
    > quality of the group parameters.
    
    While some may agree with this, the fact remains that the current 
    implementation isn't working as expected.  I'm interested in correcting 
    the behavior.
    
        - Joe
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