Johan Östling commented on SSHD-699:

Thanks for the clarification of the specs! I noticed this in conjunction with 
sshj sending these kind of messages; but from what you are saying I should 
report this as a bug with them instead.

> Server receiving 0-length SSH_MSG_IGNORE causes Buffer Underflow exception
> --------------------------------------------------------------------------
>                 Key: SSHD-699
>                 URL: https://issues.apache.org/jira/browse/SSHD-699
>             Project: MINA SSHD
>          Issue Type: Improvement
>    Affects Versions: 1.2.0
>            Reporter: Johan Östling
>            Assignee: Goldstein Lyor
>            Priority: Minor
> Trying to establish the length of a message with only a header byte will 
> cause a buffer underflow exception. I noticed it on SSH_MSG_IGNORE, but it is 
> probably general to all messages.
> Reproducible with unit test: 
> {code:title=AbstractSessionTest.java|borderStyle=solid}
>     @Test
>     public void testZeroLengthIgnoreMessage() throws Exception {
>         Buffer msg = session.createBuffer(SshConstants.SSH_MSG_IGNORE, 
> Byte.SIZE);
>         session.handleIgnore(msg);
>     }
> {code}
> This is a regression since 0.14.0, which did not have this problem.

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