Re: [Mailman-Users] Spam avoidance, revisited: best practices?

2006-08-23 Thread Florian Weimer
* Matt England:

 I'm also considering adding these capabilities (which may or may not be 
 implicit in the above description) to combat spam:

 * Don't allow email from non-subscribers
 * Moderate email from new subscribers some period of time (probably a day 
 to a week)

I've compiled a few instructions for setting up Exim and Mailman such
that Exim rejects non-members at the SMTP level:

  http://www.enyo.de/fw/software/exim/mailman-smtp-reject.html

Once you've got a way to query the subscriber list from Exim, you can
configure different actions, of course (such as greylisting, if you
like that).
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Re: [Mailman-Users] security heads up - path traversal with 2.1.5

2005-02-14 Thread Florian Weimer
* Chuq Von Rospach:

 my position is simple (and unchanged): if it's not your project, don't 
 make strategic decisions about it.

Unfortunately, the crackers that began to attack Mailman sites in
January didn't respect your wishes.

Who has a say in the disclosure of a security bug?  The person who
discovers it?  The bad guy who exploits it?  The person who discovers
evidence of a break-in?  The site administrator who discovers the
exploit used by the bad guy?  The security team which is contacted by
the site adminsitrator?  The author who wrote the software? The
vendors who make money distributing the product?  Site administrators
who have been attacked and don't know about it yet?[1] Site
administrators who might be attacked in the future?

You're trying to establish something like ownership of security bugs.
This might work if all parties cooperate in a process that ensure
secrecy (including your users, who might as well switch to different
software because they don't trust you because you're hding critical
bugs from them).  It breaks down as soon as someone doesn't play by
your rules, as it happened in this case.

[1] full-disclosure was not the first mailing list that was attacked.
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Re: [Mailman-Users] security heads up - path traversal with 2.1.5

2005-02-14 Thread Florian Weimer
* Brad Knowles:

 At 1:24 PM +0100 2005-02-14, Florian Weimer wrote:

  Who has a say in the disclosure of a security bug?

   In terms of who can post such things to this list?  Well, as one 
 of the core developers for Mailman, Chuq is one of the very few 
 people who can have an absolute say in that.

The underlying assumption seems to be that Mailman security bugs can
only be disclosed by posting them on the Mailman lists.  This is just
not true, there are plenty of different ways of disseminating security
bugs (includign selling it to CERT/CC or iDefense).  I can't really
understand your apparent intent to prevent discussions about bugs
which were disclosed elsewhere.  I simply fail to see any benefits for
you or your users.
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[Mailman-Users] Sender: header considered harmful (sort of)

2001-04-11 Thread Florian Weimer

Is it possible to remove the sender header from answers to
administrative requests sent out by Mailman?

There's some broken software out there which uses a Sender: header for
replies if it's present, and this software is widely used by some
audiences. :-/

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Re: [Mailman-Users] How do I get the from address?

2001-01-15 Thread Florian Weimer

John W Baxter [EMAIL PROTECTED] writes:

 Or one can look at Mastering Regular Expressions page 316 which contains,
 in highly compressed micro type, a 6,598 byte (he says) regular expression
 for matching email addresses.

Something has to be wrong.  The mail address syntax described in RFC
822 in is definitely not regular, that's why a regular expression
matching mail addresses does not exist.

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