Summarizing Known Attacks on Transport Layer Security (TLS) and Datagram TLS (DTLS)
RFC 7457
Internet Engineering Task Force (IETF) Y. Sheffer
Request for Comments: 7457 Porticor
Category: Informational R. Holz
ISSN: 2070-1721 Technische Universitaet Muenchen
P. Saint-Andre
&yet
February 2015
Summarizing Known Attacks on Transport Layer Security (TLS)
and Datagram TLS (DTLS)
Abstract
Over the last few years, there have been several serious attacks on
Transport Layer Security (TLS), including attacks on its most
commonly used ciphers and modes of operation. This document
summarizes these attacks, with the goal of motivating generic and
protocol-specific recommendations on the usage of TLS and Datagram
TLS (DTLS).
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7457.
Sheffer, et al. Informational [Page 1]
RFC 7457 TLS Attacks February 2015
Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents
1. Introduction ....................................................3
2. Attacks on TLS ..................................................3
2.1. SSL Stripping ..............................................3
2.2. STARTTLS Command Injection Attack (CVE-2011-0411) ..........4
2.3. BEAST (CVE-2011-3389) ......................................4
2.4. Padding Oracle Attacks .....................................4
2.5. Attacks on RC4 .............................................5
2.6. Compression Attacks: CRIME, TIME, and BREACH ...............5
2.7. Certificate and RSA-Related Attacks ........................5
2.8. Theft of RSA Private Keys ..................................6
2.9. Diffie-Hellman Parameters ..................................6
2.10. Renegotiation (CVE-2009-3555) .............................6
2.11. Triple Handshake (CVE-2014-1295) ..........................6
2.12. Virtual Host Confusion ....................................7
2.13. Denial of Service .........................................7
2.14. Implementation Issues .....................................7
2.15. Usability .................................................8
3. Applicability to DTLS ...........................................8
4. Security Considerations .........................................8
5. Informative References ..........................................8
Acknowledgements ..................................................13
Authors' Addresses ................................................13
Sheffer, et al. Informational [Page 2]
RFC 7457 TLS Attacks February 2015
1. Introduction
Over the last few years, there have been several major attacks on TLS
[RFC5246], including attacks on its most commonly used ciphers and
modes of operation. Details are given in Section 2, but a quick
summary is that both AES-CBC and RC4, which together make up for most
current usage, have been seriously attacked in the context of TLS.
This situation was one of the motivations for the creation of the UTA
working group, which was tasked with the creation of generic and
protocol-specific recommendations for the use of TLS and DTLS
[RFC6347] (unless otherwise noted under Section 3, all of the
information provided in this document applies to DTLS).
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