Re: Cisco PIX fixup protocol command

["Ivan Coric" <ivan.coric () workcoverqld com au>]

Hi Rohit,
> From the Cisco website:

---------------------------------------------------------------------------------------------------------------------------------------------------------------
The fixup protocol commands let you view, change, enable, or disable the use of a service or protocol through the PIX 
Firewall. The ports you specify are those that the PIX Firewall listens at for each respective service. You can change 
the port value for each service except rsh and sip. The fixup protocol commands are always present in the configuration 
and are enabled by default.

The fixup protocol command performs the Adaptive Security Algorithm based on different port numbers other than the 
defaults.  This command is global and changes things for both inbound and outbound connections, and cannot be 
restricted to any static command statements.

The clear fixup command removes fixup commands from the configuration that you added. It does not remove the default 
fixup protocol commands.

The show fixup command lists all values or the show fixup protocolprotocol command lists an individual protocol.

You can disable the fixup of a protocol by removing all fixups of the protocol from the configuration using the no 
fixup command.  After you remove all fixups for a protocol, the no fixup form of the command or the default port is 
stored in the configuration.
http://www.cisco.com/en/US/products/sw/secursw/ps2120/products_command_reference_chapter09186a008008d079.html#1029408
---------------------------------------------------------------------------------------------------------------------------------------------------------------
no fixup    
Disables the fixup of a protocol by removing all fixups of the protocol from the configuration using the no fixup 
command.  After removing all fixups for a protocol, the no fixup form of the command or the default port is stored in 
the configuration.
---------------------------------------------------------------------------------------------------------------------------------------------------------------


Secure Firewall using Cisco PIX Version  
http://www.securityfocus.com/guest/6811
 
Old, but a good decription
Cisco Secure PIX Firewall SMTP Filtering Vulnerability 
http://www.securiteam.com/securitynews/5NP0O205FI.html

Cheers
Ivan



Ivan Coric, CISSP
IT Technical Security Officer
Information Technology
WorkCover Queensland
Ph: (07) 30066414 Fax: (07) 30066424
Email: ivan.coric () workcoverqld com au

> > > "S.Rohit" <s.rohit () usa net> 02/11/04 08:52pm >>>
hi everyone....

   might sound like a very stupid question to ask, but i am looking for info
on wat is the use of fixup protocol commands on the Cisco PIX device. wat is
the exact usage and significance of this commands? and wat are the security
implications of this command? i know that some fixup's like say fixup protocol
smtp are good cos of the way they restrict the SMTP command set but how about
the general syntax [no] fixup protocol [service] [port]? what is this used for
and wat are the security implications for this?

   i am asking this because i'm seeing a recommendation in some PIX hardening
guide to disable fixups or they flag fixups as a security issue? y is tat? rohit



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