[TLS] [Technical Errata Reported] RFC5246 (2643)
RFC Errata System <rfc-editor@rfc-editor.org> Tue, 23 November 2010 05:20 UTC
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Subject: [TLS] [Technical Errata Reported] RFC5246 (2643)
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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_search.php?rfc=5246&eid=2643 -------------------------------------- Type: Technical Reported by: Matt McCutchen <matt@mattmccutchen.net> Section: E.3 Original Text ------------- When a TLS-capable server negotiates SSL 2.0 it SHOULD, after decrypting the ENCRYPTED-KEY-DATA field, check that these 8 padding bytes are 0x03. If they are not, the server SHOULD generate a random value for SECRET-KEY-DATA, and continue the handshake (which will eventually fail since the keys will not match). Corrected Text -------------- When a TLS-capable server negotiates SSL 2.0 it SHOULD, after decrypting the ENCRYPTED-KEY-DATA field, check that these 8 padding bytes are not all 0x03. If they are, the server SHOULD generate a random value for SECRET-KEY-DATA, and continue the handshake (which will eventually fail since the keys will not match). Notes ----- The condition is the wrong way around. When the bytes *are* all 0x03, that means the client supports TLS, so there must have been a version rollback attack in order for SSL 2.0 to be negotiated. For example, see the NSS implementation (line number may rot): https://mxr.mozilla.org/mozilla/source/security/nss/lib/ssl/sslcon.c#1695 Instructions: ------------- This errata 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 (IESG) 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
- [TLS] [Technical Errata Reported] RFC5246 (2643) RFC Errata System
- Re: [TLS] [Technical Errata Reported] RFC5246 (26… Michael D'Errico
- Re: [TLS] [Technical Errata Reported] RFC5246 (26… Marsh Ray