[Bug 1863930] Re: SSH 1.99 clients fail to connect to openssh-server 1:7.6p1-4ubuntu0.3

[Colin Watson]

I have time to maintain openssh in Debian, but in general I don't have
cycles to deal with SRUs, so please could somebody else take care of
that part?

** Changed in: openssh (Ubuntu Bionic)
     Assignee: Colin Watson (cjwatson) => (unassigned)

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Title:
  SSH 1.99 clients fail to connect to openssh-server 1:7.6p1-4ubuntu0.3

Status in openssh package in Ubuntu:
  Fix Released
Status in openssh source package in Bionic:
  New

Bug description:
  SSHD closes the connection and logs the error message below when a
  client presents a protoversion of "1.99":

      Protocol major versions differ for X.X.X.X port X:
  SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 vs. SSH-1.99-XXX

  RFC 4253 only states that clients should treat a server's protoversion
  of "1.99" as equivalent to "2.0"; however, some backward-compatible
  clients send a protoversion of "1.99" and expect the server to treat
  it as "2.0".

  This regression was introduced in openssh-portable 7.6p1 from commit
  97f4d3083; fixes were implemented in commits 9e9c4a7e5 and c9c1bba06.
  I've attached a patch with both of those fixes.

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