[TLS] [Errata Held for Document Update] RFC5246 (6244)

RFC Errata System <rfc-editor@rfc-editor.org> Thu, 21 March 2024 03:51 UTC

To: voip.isdn@gmail.com, tim@dierks.org, ekr@rtfm.com
From: RFC Errata System <rfc-editor@rfc-editor.org>
Cc: paul.wouters@aiven.io, iesg@ietf.org, tls@ietf.org, rfc-editor@rfc-editor.org
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Message-Id: <20240321035131.8CFCB5BEC3F@rfcpa.amsl.com>
Date: Wed, 20 Mar 2024 20:51:31 -0700
Archived-At: <https://mailarchive.ietf.org/arch/msg/tls/PXFDKSnkbXD2nMAszHGHpMoPk4Y>
Subject: [TLS] [Errata Held for Document Update] RFC5246 (6244)
Precedence: list

The following errata report has been held for document update 
for RFC5246, "The Transport Layer Security (TLS) Protocol Version 1.2". 

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid6244

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Status: Held for Document Update
Type: Editorial

Reported by: Victor S. Osipov <voip.isdn@gmail.com>
Date Reported: 2020-07-29
Held by: Paul Wouters (IESG)

Section: 6.2.3.2

Original Text
-------------
IV
The Initialization Vector (IV) SHOULD be chosen at random, and
MUST be unpredictable. Note that in versions of TLS prior to 1.1,
there was no IV field, and the last ciphertext block of the
previous record (the "CBC residue") was used as the IV. This was
changed to prevent the attacks described in [CBCATT]. For block
ciphers, the IV length is of length
SecurityParameters.record_iv_length, which is equal to the
SecurityParameters.block_size.

Corrected Text
--------------
IV
The Initialization Vector (IV) SHOULD be chosen at random, and
MUST be unpredictable. Note that in versions of TLS prior to 1.1,
there was no IV field, and the last ciphertext block of the
previous record (the "CBC residue") was used as the IV. This was
changed to prevent the attacks described in [CBCATT]. For block
ciphers, the IV length is of length
SecurityParameters.record_iv_length, which is equal to the
SecurityParameters.block_length.

Notes
-----
This is an error here. The structure SecurityParameters hasn't the element block_size.
It has the element block_length.
See in section 6.1:
struct {
ConnectionEnd entity;
PRFAlgorithm prf_algorithm;
BulkCipherAlgorithm bulk_cipher_algorithm;
CipherType cipher_type;
uint8 enc_key_length;
uint8 block_length;
uint8 fixed_iv_length;
uint8 record_iv_length;
MACAlgorithm mac_algorithm;
uint8 mac_length;
uint8 mac_key_length;
CompressionMethod compression_algorithm;
opaque master_secret[48];
opaque client_random[32];
opaque server_random[32];
} SecurityParameters;


Paul Wouters (AD): Note this RFC is obsoleted and all of this text already got removed

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RFC5246 (draft-ietf-tls-rfc4346-bis-10)
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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
Stream              : IETF
Verifying Party     : IESG

[TLS] [Errata Held for Document Update] RFC5246 (… RFC Errata System