HTTP filter settings (you all know how to get there). 1. Extensions: <choice> Set "block specified" Add .wmf Description="application/x-msmetafile" </choice> <choice> Set "allow specified" Remove .wmf </choice> <notachoice> Set "allow all" </notachoice> 2. Signatures: Name=WMF-1 Description="request file type trigger" Type="Request URL" Signature=".wmf" Name=WMF-2 Description="response headers trigger" Type="Response Headers" HTTP Header="content-type" Signature="msmetafile" Name=WMF-3 Description="response body file type trigger" Type="Response Body" Signature=".wmf" Name=WMF-4 Description="response body file header trigger" Type="Response Body" Signature="184Gmg" WMF-4 is the kewl one because all binary files are base-64 encoded when transferred over HTTP and FTP. WMF files usually incorporate a predefined header value that resolves to the Base-64 signature in this definition. It's probably the same technique as the GFI filter, except not as smart. ------------------------------------------------------- Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! ------------------------------------------------------- -----Original Message----- From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] Sent: Wednesday, January 04, 2006 15:27 To: [ISAserver.org Discussion List] Subject: [isalist] RE: WMF Vunrability http://www.ISAserver.org Hey Jim, Forget about the automation, just let us know what to do :) Thanks! Tom Thomas W Shinder, M.D. Site: www.isaserver.org Blog: http://spaces.msn.com/members/drisa/ Book: http://tinyurl.com/3xqb7 MVP -- ISA Firewalls > -----Original Message----- > From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] > Sent: Wednesday, January 04, 2006 2:18 PM > To: [ISAserver.org Discussion List] > Subject: [isalist] RE: WMF Vunrability > > http://www.ISAserver.org > > Sorry - I haven't. > I'm working with MSRC to narrow down the definitions and automation > for the ISA 2004 blocker. > > > ------------------------------------------------------- > Jim Harrison > MCP(NT4, W2K), A+, Network+, PCG > http://isaserver.org/Jim_Harrison/ > http://isatools.org > Read the help / books / articles! > ------------------------------------------------------- > > > -----Original Message----- > From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx] > Sent: Wednesday, January 04, 2006 11:45 > To: [ISAserver.org Discussion List] > Subject: [isalist] RE: WMF Vunrability > > http://www.ISAserver.org > > Jim, did you read this? I'm wondering if the method described to > "block extensions" is correct or not. Rather than using "Configure > HTTP" and setting allowable extensions, I though one should explicitly > create a deny rule specifying both the .wmf extension *as well* as > application/x-msmetafile as the MIME type. Incoming HTTP file > associations are handled by MIME type, not file extension. Only when > there is no MIME type handed down by the server is a file extension > used (or when you do an actual file transfer, like with FTP.) > > Comments on that? > > t > > > > ----- > "I may disapprove of what you say, > but I will defend to the death your > right to say it." > > > ----- Original Message ----- > From: "Stefaan Pouseele" <stefaan.pouseele@xxxxxxxxx> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> > Sent: Wednesday, January 04, 2006 11:24 AM > Subject: [isalist] RE: WMF Vunrability > > > > http://www.ISAserver.org > > > > Hey guys, > > > > Check out > > > http://blogs.technet.com/jesper_johansson/archive/2006/01/02/4 > 16762.aspx > > too > > ;-) > > > > HTH, > > Stefaan > > > > -----Original Message----- > > From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] > > Sent: woensdag 4 januari 2006 20:16 > > To: [ISAserver.org Discussion List] > > Subject: [isalist] RE: WMF Vunrability > > > > http://www.ISAserver.org > > > > Hi Tim, > > > > I agree. There seems to be than the ususal amount of FUD > associated with > > this problem. :( > > > > Tom > > > > Thomas W Shinder, M.D. > > Site: www.isaserver.org > > Blog: http://spaces.msn.com/members/drisa/ > > Book: http://tinyurl.com/3xqb7 > > MVP -- ISA Firewalls > > **Who is John Galt?** > > > > > > > >> -----Original Message----- > >> From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx] > >> Sent: Wednesday, January 04, 2006 1:01 PM > >> To: [ISAserver.org Discussion List] > >> Subject: [isalist] RE: WMF Vunrability > >> > >> http://www.ISAserver.org > >> > >> I wouldn't call it "program like behavior." They just contain both > >> metadata and rendering data in the same file (as I understand it.) > >> > >> Renaming the file to something like ".gif" or ".jpg" could > still cause > >> execution if loaded from a file, but only if the Picture and Fax > >> Viewer was the default program for those file types. From > a browser, > >> for WP&FV to open it and parse the data, it has to be that > MIME type > >> (again, as I understand > >> it.) > >> > >> While I've read here that the "way to do it" is how GFI > does it, I've > >> still not seen any information on why simple content > filtering won't > >> work. But then again, I read where Jim is working with > MSRC to come > >> up with a "workable" filter. It would be nice to get some > >> authoritative, detailed information on why MIME and file type > >> filtering *won't* work. > >> > >> t > >> > >> > >> ----- > >> "I may disapprove of what you say, > >> but I will defend to the death your right to say it." > >> > >> > >> ----- Original Message ----- > >> From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx> > >> To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> > >> Sent: Wednesday, January 04, 2006 10:31 AM > >> Subject: [isalist] RE: WMF Vunrability > >> > >> > >> http://www.ISAserver.org > >> > >> Hi Tim, > >> > >> Don't know about that, but it's a good question. But I > have to wonder > >> about other apps that open the WMF files. FWIU, WMF files > have some > >> program like behavior that allow it to call other programs if > >> something doesn't work. > >> > >> How's that as a erudite description for a process? :) > >> > >> Tom > >> > >> Thomas W Shinder, M.D. > >> Site: www.isaserver.org > >> Blog: http://spaces.msn.com/members/drisa/ > >> Book: http://tinyurl.com/3xqb7 > >> MVP -- ISA Firewalls > >> **Who is John Galt?** > >> > >> > >> > >> > -----Original Message----- > >> > From: Thor (Hammer of God) [mailto:thor@xxxxxxxxxxxxxxx] > >> > Sent: Wednesday, January 04, 2006 12:13 PM > >> > To: [ISAserver.org Discussion List] > >> > Subject: [isalist] RE: WMF Vunrability > >> > > >> > http://www.ISAserver.org > >> > > >> > But if he sets a differnt mime type, Fax Viewer won't open the > >> > program, right? > >> > > >> > t > >> > ----- > >> > "I may disapprove of what you say, > >> > but I will defend to the death your > >> > right to say it." > >> > > >> > > >> > ----- Original Message ----- > >> > From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx> > >> > To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx> > >> > Sent: Wednesday, January 04, 2006 9:32 AM > >> > Subject: [isalist] RE: WMF Vunrability > >> > > >> > > >> > http://www.ISAserver.org > >> > > >> > Hi Jonathon, > >> > > >> > That won't work, because the scumbag can use any file > name he wants. > >> > Same goes with the MIME type. The MIME type is set at the Web > >> > server, so the scumbag can associate any MIME type he wants. > >> > > >> > Tom > >> > > >> > Thomas W Shinder, M.D. > >> > Site: www.isaserver.org > >> > Blog: http://spaces.msn.com/members/drisa/ > >> > Book: http://tinyurl.com/3xqb7 > >> > MVP -- ISA Firewalls > >> > **Who is John Galt?** > >> > > >> > > >> > > >> > > -----Original Message----- > >> > > From: Jonathon J. Howey [mailto:Jonathon@xxxxxxx] > >> > > Sent: Wednesday, January 04, 2006 11:25 AM > >> > > To: [ISAserver.org Discussion List] > >> > > Subject: [isalist] RE: WMF Vunrability > >> > > > >> > > http://www.ISAserver.org > >> > > > >> > > What I did to block it was: > >> > > > >> > > Internet Access Policy -> Protocols tab -> Filtering -> > >> > Configure HTTP > >> > > -> Extensions tab. Should be self explanatory from there. > >> > > > >> > > > >> > > > >> > > Jonathon J. Howey > >> > > KPSA Compliance Management Inc. > >> > > P 780.409.5620 > >> > > F 780.409.5621 > >> > > D 780.409.5628 > >> > > C 780.965.8363 > >> > > Jonathon@xxxxxxx > >> > > > >> > > Guiding the Future of Transportation www.KPSA.ca > >> > > > >> > > > >> > > > >> > > -----Original Message----- > >> > > From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] > >> > > Sent: January 4, 2006 10:12 AM > >> > > To: [ISAserver.org Discussion List] > >> > > Subject: [isalist] RE: WMF Vunrability > >> > > > >> > > http://www.ISAserver.org > >> > > > >> > > He never stated what his "block" was. > >> > > > >> > > > >> > > ------------------------------------------------------- > >> > > Jim Harrison > >> > > MCP(NT4, W2K), A+, Network+, PCG > >> > > http://isaserver.org/Jim_Harrison/ > >> > > http://isatools.org > >> > > Read the help / books / articles! > >> > > ------------------------------------------------------- > >> > > > >> > > > >> > > -----Original Message----- > >> > > From: Brian Boyes [mailto:BrianB@xxxxxxxxx] > >> > > Sent: Wednesday, January 04, 2006 09:02 > >> > > To: [ISAserver.org Discussion List] > >> > > Subject: [isalist] RE: WMF Vunrability > >> > > > >> > > http://www.ISAserver.org > >> > > > >> > > > I have installed the "wmf" block to my ISA 2004 clients but > >> > > I not sure > >> > > > >> > > > how to set this up for ISA 2000. > >> > > > Could someone provide advice of the best way to do this. > >> > > > >> > > Did anyone ever post an answer? I'm curious about this > >> "wmf block". > >> > > > >> > > Brian > >> > > > > > > > > ------------------------------------------------------ > > List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist > > ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp > > ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ > > ------------------------------------------------------ > > Visit TechGenix.com for more information about our other sites: > > http://www.techgenix.com > > ------------------------------------------------------ > > You are currently subscribed to this ISAserver.org > Discussion List as: > > thor@xxxxxxxxxxxxxxx > > To unsubscribe visit > http://www.webelists.com/cgi/lyris.pl?enter=isalist > > Report abuse to listadmin@xxxxxxxxxxxxx > > > > > > > ------------------------------------------------------ > List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist > ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp > ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ > ------------------------------------------------------ > Visit TechGenix.com for more information about our other sites: > http://www.techgenix.com > ------------------------------------------------------ > You are currently subscribed to this ISAserver.org Discussion > List as: jim@xxxxxxxxxxxx > To unsubscribe visit > http://www.webelists.com/cgi/lyris.pl?enter=isalist > Report abuse to listadmin@xxxxxxxxxxxxx > > All mail to and from this domain is GFI-scanned. > > > ------------------------------------------------------ > List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist > ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp > ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ > ------------------------------------------------------ > Visit TechGenix.com for more information about our other sites: > http://www.techgenix.com > ------------------------------------------------------ > You are currently subscribed to this ISAserver.org Discussion > List as: tshinder@xxxxxxxxxxxxxxxxxx > To unsubscribe visit > http://www.webelists.com/cgi/lyris.pl?enter=isalist > Report abuse to listadmin@xxxxxxxxxxxxx > > ------------------------------------------------------ List Archives: http://www.webelists.com/cgi/lyris.pl?enter=isalist ISA Server Newsletter: http://www.isaserver.org/pages/newsletter.asp ISA Server FAQ: http://www.isaserver.org/pages/larticle.asp?type=FAQ ------------------------------------------------------ Visit TechGenix.com for more information about our other sites: http://www.techgenix.com ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe visit http://www.webelists.com/cgi/lyris.pl?enter=isalist Report abuse to listadmin@xxxxxxxxxxxxx All mail to and from this domain is GFI-scanned.