full-disclosure - Re: Holes in the firewall of Mac OS X Leopard

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Tue, 30 Oct 2007 00:55:28 +0100 (CET)
From: Juergen Schmidt <ju@...sec.de>
To: "Brandon S. Allbery KF8NH" <allbery@....cmu.edu>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>,
	bugtraq@...urityfocus.com
Subject: Re: Holes in the firewall of Mac OS X Leopard

On Mon, 29 Oct 2007, Brandon S. Allbery KF8NH wrote:

> On Oct 29, 2007, at 17:49 , Juergen Schmidt wrote:
> 
> >- if you set it to "Block all incoming connections" it still allows access
> >to certain system services. We could access the ntp daemon that is running
> >per default over the internet. In a LAN based scenario, we were able to
> >query the Netbios naming service even with full blocking enabled.
> 
> The firewall in Tiger, and presumably Leopard, only affects TCP services by
> default (you can enable UDP filtering in the Advanced settings).  So no change
> here from the status quo.

Nope -- the behaviour we observed did not depend on the protocol by any 
means. For example we were able to connect to a netcat server listening on 
a TCP port despite of "Set access to specific services and programs" and 
an empty list of allowed services.

There is no way to "enable UDP filtering" in Leopard either -- at least I 
have not found any. In fact the firewall does not use ipfw rules at all. 

bye, ju

-- 
Juergen Schmidt, editor-in-chief heise Security www.heise-security.co.uk
GPG-Key: 0x38EA4970,  5D7B 476D 84D5 94FF E7C5  67BE F895 0A18 38EA 4970

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/