full-disclosure - Re: Filtering sobig with postfix

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From: JThomas at poweronemedia.com (Joshua Thomas)
Subject: Re: Filtering sobig with postfix

Thank you, Thank you, Thank you.

I just set up a box with postfix, and have been trying to figure out how to
do this.

Joshua Thomas
Network Operations Engineer
PowerOne Media, Inc.
tel: 518-687-6143
jthomas@...eronemedia.com 

-----Original Message-----
From: Bojan Zdrnja [mailto:Bojan.Zdrnja@....hr]
Sent: Wednesday, August 20, 2003 11:52 PM
To: full-disclosure@...ts.netsys.com
Subject: RE: [Full-Disclosure] Re: Filtering sobig with postfix




> -----Original Message-----
> From: full-disclosure-admin@...ts.netsys.com 
> [mailto:full-disclosure-admin@...ts.netsys.com] On Behalf Of 
> martin f krafft
> Sent: Wednesday, 20 August 2003 10:43 p.m.
> To: full-disclosure@...ts.netsys.com
> Subject: [Full-Disclosure] Re: Filtering sobig with postfix
> 
> 
> also sprach vogt@...senet.com <vogt@...senet.com> 
> [2003.08.20.1017 +0200]:
> > in main.cf, enable "body_checks = (filename)". In that (filename)
> > file, write a regular expression matching sobig, e.g. something
> > like
> > 
> > /see attached file for details/	REJECT
> 
> this incurs a factor 2-4 performance drop, and it could also elicit
> false positives. you should definitely do more than just REJECT
> (i.e. write out a message: s/REJECT/554 Suspected virus/).

Yep, as the OP is using postfix, he could use the header_checks directive,
which can identify MIME headers, so he can easily stop this worm.
Just check for Content-Disposition header and block everything with .pif in
filename.

Regards,

Bojan Zdrnja

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