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From: Daniel Kahn Gillmor <>
To: David Bremner <>,
	Peter Wang <>,
	notmuch mailing list <>
Subject: Re: a DoS vulnerability associated with conflated Message-IDs?
Date: Fri, 04 Aug 2017 18:15:13 -0400	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri 2017-08-04 16:42:54 -0400, David Bremner wrote:
> Peter Wang <> writes:
>> On Thu, 08 Mar 2012 11:37:09 -0500, Daniel Kahn Gillmor <> wrote:
>>> notmuch currently treats all messages with the same Message-ID as
>>> the same message.  I think this could be a vulnerability :(
>>> If two messages have the same Message-ID, is there a guarantee of which
>>> of these messages will be produced during a notmuch show?
>>> Either way, it seems to create a potential DoS attack on notmuch users.
>> Yesterday I was expecting a confirmation message which, seemingly, never
>> came.  It turns out my maildir already contained a message from the
>> same system.  From three years ago.  With the same Message-ID.
>> Malice has nothing on incompetence.
>> Could we distinguish messages with identical Message-IDs based on
>> some header fields, e.g. Date, From?
> I wouldn't say this problem is fixed, but we are making some
> progress. In master all copies of the file are now indexed. It still
> needs various UI work before we can consider the problem really fixed,
> but it is now technically possible to detect such an attack (since the
> "good terms" are also indexed).

otoh, we now enable some additional (perhaps weirder) attacks, like:

 * i can make someone else's mail show up in your mailbox with a search
   term of my choosing by sending you a new mail co-opting their

we definitely need some UI for dealing with this, and perhaps some
explicit de-duping logic or maintenance scripts would be useful too.


  reply	other threads:[~2017-08-04 22:23 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-03-08 16:37 a DoS vulnerability associated with conflated Message-IDs? Daniel Kahn Gillmor
2012-03-08 17:04 ` James Vasile
2012-03-08 17:16   ` Daniel Kahn Gillmor
2012-03-08 17:38     ` Jeremy Nickurak
2012-03-10 17:38       ` Tom Prince
2012-10-29 11:15 ` Peter Wang
2017-08-04 20:42   ` David Bremner
2017-08-04 22:15     ` Daniel Kahn Gillmor [this message]
2022-07-30 12:41       ` David Bremner

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