oss-sec mailing list archives
Re: ezmlm signature mangling [was: Re: CVE request: sympa (try again)]
From: Solar Designer <solar () openwall com>
Date: Sat, 12 May 2012 21:19:43 +0400
On Sat, May 12, 2012 at 01:44:19AM -0400, Daniel Kahn Gillmor wrote:
On 05/11/2012 02:03 PM, micah wrote:ps - for some reason the previous message is formatted strange, so I'm sending this one without the signatureComparing the received version of the message with its original source, it appears that the mailing list software (ezmlm?) mangled Micah's message by modifying the internal mime parts of the message, despite them being wrapped inside a multipart/signed block. This contravenes the relevant standards [0], which indicate that the data within a multipart/signed MIME part needs to be treated by any MTA as opaque. I don't know who updates ezmlm these days, but that probably needs to be addressed if there's an expectation that people should be able to send cryptographically-signed messages with non-ASCII text to the list. --dkg [0] https://tools.ietf.org/html/rfc3156#section-3
Thank you for looking into this issue. I also briefly looked into it yesterday. My guess is that the issue might have been triggered by the rather unusual MIME section boundary strings ("=-=-="). Maybe these are specific to Notmuch. We had other signed messages in here, which got through to the list just fine. For just one affected message in 7658 (total on this list so far), I think I am not going to bother to investigate this further and patch it. Alexander
Current thread:
- CVE request: sympa (try again) micah (May 11)
- ezmlm signature mangling [was: Re: CVE request: sympa (try again)] Daniel Kahn Gillmor (May 11)
- Re: ezmlm signature mangling [was: Re: CVE request: sympa (try again)] Solar Designer (May 12)
- Re: CVE request: sympa (try again) Kurt Seifried (May 11)
- Re: CVE request: sympa (try again) micah anderson (May 12)
- Re: CVE request: sympa (try again) Kurt Seifried (May 12)
- Re: CVE request: sympa (try again) micah anderson (May 15)
- Re: CVE request: sympa (try again) Kurt Seifried (May 15)
- Re: CVE request: sympa (try again) micah anderson (May 12)
- ezmlm signature mangling [was: Re: CVE request: sympa (try again)] Daniel Kahn Gillmor (May 11)