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https://issues.apache.org/jira/browse/NET-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12887241#action_12887241
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Sebb commented on NET-74:
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It looks as though TelnetInputStream does handle IAC+IAC correctly when
processing options, so it is just when generating options that the problem may
arise.
> [net]Telnet option handlers subnegotiations does not handle 0xFF correctly
> --------------------------------------------------------------------------
>
> Key: NET-74
> URL: https://issues.apache.org/jira/browse/NET-74
> Project: Commons Net
> Issue Type: Bug
> Components: Telnet
> Environment: Operating System: other
> Platform: Other
> Reporter: Yuval Kashtan
> Priority: Minor
>
> in accordance to RFC855: "Finally, if parameters in an option "subnegotiation"
> include a byte with a value of 255, it is necessary to double this byte in
> accordance the general TELNET rules."
> I've actually encontered this while implementing WindowSize option handler,
> but
> it seems that all the currently avilable handlers are vulnerable to this.
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