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https://issues.apache.org/jira/browse/SSHD-1136?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Achim Hügen updated SSHD-1136:
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Summary: Diffie Hellmann group exchange falls back to insecure DHG1 if
agreement on modulo size is not possible (was: Diffie Hellmann group exchange
falls back to insecure DHG1 if agreement on moduli size is not possible)
> Diffie Hellmann group exchange falls back to insecure DHG1 if agreement on
> modulo size is not possible
> ------------------------------------------------------------------------------------------------------
>
> Key: SSHD-1136
> URL: https://issues.apache.org/jira/browse/SSHD-1136
> Project: MINA SSHD
> Issue Type: Bug
> Affects Versions: 2.6.0
> Reporter: Achim Hügen
> Priority: Major
>
> After implementation of SSHD-1107 we configured the minimum modulo size of
> diffie-hellman-group-exchange-sha256 to 2048 bit and expected clients that
> doesn't support this minimum to not be able to connect.
> But what happens is that, those clients still can connect and this warning is
> logged:
> {code}
> chooseDH(DHGEXServer[diffie-hellman-group-exchange-sha256])[ShaftServerSession[null@/10.42.110.99:44222]][prf=1024,
> min=1024, max=1024] No suitable primes found, defaulting to DHG1
> {code}
> My understanding is, that this is a fallback to diffie-hellman-group1-sha1
> which is week, see https://www.openssh.com/legacy.html
> Mina should make this fallback configurable and not activate it by default.
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