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#145419 - 2005-08-11 04:12 PM Disabling DEP in SP2 using KiX?
jdogg Offline
Getting the hang of it

Registered: 2003-09-11
Posts: 91
Loc: RTP, North Cakalaka, USA
Hi all,

In my company, we have not rolled out Windows XP SP2 to the general population yet, but are considering it.
One of the two roadblocks to doing this is the problems we experience with our applications and DEP (Data Execution Prevention) (the other roadblock is the built-in firewall that is enabled by default).

There is a way to turn off DEP system wide on a machine, but it requires modifying the critical file boot.ini.
Here is the Microsoft article:
Article on Disabling DEP
Has anyone experimented with this?
Has anyone already scripted something to add the AlwaysOff setting in the boot.ini?
With my limited scripting expertise, I am very wary of doing ANYTHING to the boot.ini through a logon script (or through any other method for that matter).

I almost put this in the "Discussions" category, but I am first and foremost a "Starter".

Thanks for any discussion/suggestions.
-jdogg
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#145420 - 2005-08-11 04:44 PM Re: Disabling DEP in SP2 using KiX?
Mart Moderator Offline
KiX Supporter
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Registered: 2002-03-27
Posts: 4673
Loc: The Netherlands
The MS way to disable DEP works great but requires a modification of the boot.ini on ALL computers.
Just creating one new boot.ini and copying it to all clients would be easier imho.

This should do. !! WARNING: NOT TESTED !!

Code:

$Local = GetFileTime ("c:\boot.ini")
$Remote = GetFileTime ("\\server\share\boot.ini")
If
	$Local <> $Remote
		;copy the original boot.ini file for backup.
		Copy "c:\boot.ini" "c:\bootini.old" /h
		;copy new boot.ini file to client.
		Copy "\\server\share\boot.ini" "c:\boot.ini" /h
EndIf


For the XPSP2 firewall there is a UDF to en/disable it here.

Edited by Mart (2005-08-11 04:47 PM)
_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.

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#145421 - 2005-08-11 04:53 PM Re: Disabling DEP in SP2 using KiX?
Bryce Offline
KiX Supporter
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Registered: 2000-02-29
Posts: 3167
Loc: Houston TX
Yikes!

i would not do a mass copy of a single boot file to all systems unless you know for a fact that all of your systems boot.ini files are pointing to the same ide drive, channel, partition, and system folder!!

if, you get the path wrong in this line...

Code:

[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptIn


your computer will not boot!

since this is a INI file, read/writeprofilestring would be the way to go.
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#145422 - 2005-08-11 04:55 PM Re: Disabling DEP in SP2 using KiX?
Mart Moderator Offline
KiX Supporter
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Registered: 2002-03-27
Posts: 4673
Loc: The Netherlands
Oke, good point.
I just assumed that all pc's are the same and installed with a default image.
_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.

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#145423 - 2005-08-11 05:02 PM Re: Disabling DEP in SP2 using KiX?
jdogg Offline
Getting the hang of it

Registered: 2003-09-11
Posts: 91
Loc: RTP, North Cakalaka, USA
Being that the boot.ini can differ on all machines, isn't your method a way to severely cripple all machines?
One method I was considering testing was to use WriteLine at the last blank line in the boot.ini and adding the exclusion.
It seems like replacing the boot.ini is dangerous, whereas appending to it would be less dangerous (although I would still sweat over this a bit).

Thanks for the FYI on the UDF for SP2 firewall disabling.
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#145424 - 2005-08-11 05:03 PM Re: Disabling DEP in SP2 using KiX?
jdogg Offline
Getting the hang of it

Registered: 2003-09-11
Posts: 91
Loc: RTP, North Cakalaka, USA
Oops... Bryce beat me to it.
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#145425 - 2005-08-11 05:06 PM Re: Disabling DEP in SP2 using KiX?
Bryce Offline
KiX Supporter
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Registered: 2000-02-29
Posts: 3167
Loc: Houston TX
here is the boot string that you will need to modify..

Code:

$boot = 'c:\boot.ini'
$defaultboot = ReadProfileString($boot,'boot loader','default')
$DefaultBootString = ReadProfileString($boot,'operating systems',$defaultboot)

? $DefaultBootString


Now i have sp2 installed, so i have "/noexecute=AlwaysOff" installed by default, you will have to do some string checking to see if this switch is not already in the default boot string so you can change it from its dafault setting, or add it if it is not.

Bryce
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#145426 - 2005-08-11 05:10 PM Re: Disabling DEP in SP2 using KiX?
Mart Moderator Offline
KiX Supporter
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Registered: 2002-03-27
Posts: 4673
Loc: The Netherlands
Yeah bryce is right. Like said I assumed all machines are the same with an identical image on it.
_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.

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#145427 - 2005-08-11 05:11 PM Re: Disabling DEP in SP2 using KiX?
Bryce Offline
KiX Supporter
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Registered: 2000-02-29
Posts: 3167
Loc: Houston TX
Quote:

Thanks for the FYI on the UDF for SP2 firewall disabling.



You can also set a global setting in group policy for the SP2 firewall.

Bryce
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#145428 - 2005-08-11 05:20 PM Re: Disabling DEP in SP2 using KiX?
Mart Moderator Offline
KiX Supporter
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Registered: 2002-03-27
Posts: 4673
Loc: The Netherlands
Can be done here in GPO:

Quote:


Computer Configuration\Administrative Templates\Extra Registry Settings\
SOFTWARE\Policies\Microsoft\WindowsFirewall\DomainProfile\EnableFirewall



Computer Configuration\Administrative Templates\Extra Registry Settings\
SOFTWARE\Policies\Microsoft\WindowsFirewall\StandardProfile\EnableFirewall




More info can be found here: ms page about configuring XPSP2 firewall
_________________________
Mart

- Chuck Norris once sold ebay to ebay on ebay.

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#145429 - 2005-08-11 05:25 PM Re: Disabling DEP in SP2 using KiX?
jdogg Offline
Getting the hang of it

Registered: 2003-09-11
Posts: 91
Loc: RTP, North Cakalaka, USA
Oooh... nice. Looks like some real options here.
Thanks again guys.
I am more immediately concerned with the DEP though, since we are upgrading our BlackICE software and DEP doesn't like the new version of BlackICE when installing on a newer machine with a processor that supports hardware-based DEP.
So I will work on testing adding/modifying a line in the boot.ini (YIKES!)
("/noexecute=AlwaysOff")
Any further suggestions on how to do this (in addition to Bryce's snippet above) would be appreciated since I am a total n00b when it comes to editing existing ini or txt files.

Thanks again!
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#145430 - 2005-08-15 08:38 PM Re: Disabling DEP in SP2 using KiX?
Skatterbrainz Offline
Starting to like KiXtart

Registered: 2002-10-17
Posts: 172
Loc: Virginia, USA
Sorry if this is off the path, but after years of MS beating developers over the head about moving from INI to registry, they go and make DEP settings in the boot.ini. No registry key alternative? What bonehead thought of that. With a regstry key, it could be controlled by a machine (group) policy so much easier.
_________________________
silence is golden, but duct tape is silver

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#145431 - 2005-08-16 12:53 AM Re: Disabling DEP in SP2 using KiX?
NTDOC Administrator Offline
Administrator
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Registered: 2000-07-28
Posts: 11631
Loc: CA
Because boot is read before the registry
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