This erratum is incorrect.
Here is the definition of SessionID:
opaque SessionID<0..32>;
The angle brackets mean that it is variable length and the 0..32 means that
there is
a one-byte length field.
On Fri, Jun 9, 2017 at 2:55 PM, RFC Errata System <[email protected]
> wrote:
> The following errata report has been submitted for RFC5246,
> "The Transport Layer Security (TLS) Protocol Version 1.2".
>
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata/eid5036
>
> --------------------------------------
> Type: Technical
> Reported by: Stefan Goeman <[email protected]>
>
> Section: 7.4.1.2
>
> Original Text
> -------------
> The ClientHello Structure indicates that a SessionID could be present.
> However if I take a wireshark of a TLS session I always see a "Session
> ID Length" field, either with value 0 or value 32
>
> Corrected Text
> --------------
> In the ClientHello structure and ServerHello structure, include
> a 1 byte "Session ID Length" field.
>
> Notes
> -----
> The ClientHello Structure indicates that a SessionID could be present.
> However if I take a wireshark of a TLS session I always see a
> "Session ID Length" field, either with value 0 or value 32.
>
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party
> can log in to change the status and edit the report, if necessary.
>
> --------------------------------------
> RFC5246 (draft-ietf-tls-rfc4346-bis-10)
> --------------------------------------
> Title : The Transport Layer Security (TLS) Protocol Version
> 1.2
> Publication Date : August 2008
> Author(s) : T. Dierks, E. Rescorla
> Category : PROPOSED STANDARD
> Source : Transport Layer Security
> Area : Security
> Stream : IETF
> Verifying Party : IESG
>
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