[Bug 3887] New: kex algorithms - proposal has empty algorithms

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3887

            Bug ID: 3887
           Summary: kex algorithms - proposal has empty algorithms
           Product: Portable OpenSSH
           Version: 8.4p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P5
         Component: sftp-server
          Assignee: unassigned-bugs at mindrot.org
          Reporter: vinay.jagannath at outlook.com

Created attachment 3918
  --> https://bugzilla.mindrot.org/attachment.cgi?id=3918&action=edit
screen shot of the kex algorithms

The kex algorithm proposal from the sftp server starts with a comma or
has consecutive commas in the proposal strings. 

I have attached the screen shot and network traces where this was
captured. this issue is not always reproducible but when it happens it
causes the client to hang. 

I have already contributed the fix for the client, Kindly check and fix
this issue from the server side.

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