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RFC 7627
Title: Transport Layer Security (TLS) Session
Hash and Extended Master Secret Extension
Author: K. Bhargavan, Ed., A. Delignat-Lavaud,
A. Pironti, A. Langley, M. Ray
Status: Standards Track
Stream: IETF
Date: September 2015
Mailbox: [email protected],
[email protected],
[email protected],
[email protected],
[email protected]
Pages: 15
Characters: 34788
Updates: RFC 5246
I-D Tag: draft-ietf-tls-session-hash-06.txt
URL: https://www.rfc-editor.org/info/rfc7627
DOI: http://dx.doi.org/10.17487/RFC7627
The Transport Layer Security (TLS) master secret is not
cryptographically bound to important session parameters such as the
server certificate. Consequently, it is possible for an active
attacker to set up two sessions, one with a client and another with a
server, such that the master secrets on the two sessions are the
same. Thereafter, any mechanism that relies on the master secret for
authentication, including session resumption, becomes vulnerable to a
man-in-the-middle attack, where the attacker can simply forward
messages back and forth between the client and server. This
specification defines a TLS extension that contextually binds the
master secret to a log of the full handshake that computes it, thus
preventing such attacks.
This document is a product of the Transport Layer Security Working Group of the
IETF.
This is now a Proposed Standard.
STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements. Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the
standardization state and status of this protocol. Distribution of this
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