full-disclosure - Re: [FD] Beginners error: Hewlett-Packards driver software executes rogue binary C:\Program.exe

Open Source and information security mailing list archives

Date: Wed, 21 May 2014 17:31:32 +0200
From: Project Un1c0rn <project.un1c0rn@...dex.com>
To: Tavis Ormandy <taviso@...xchg8b.com>
Cc: fulldisclosure@...lists.org
Subject: Re: [FD] Beginners error: Hewlett-Packards driver software executes
 rogue binary C:\Program.exe

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A filesystem is strong I completely agree, another program running as
admin that has access to it might be not.

Imagine that program can just dump NEW files everywhere (service
exploitable I dunno)

Now there's a way to abuse it to put a backdoor in C:\Program.exe in
HP included related drivers.

Or I could be mistaken, but I see every security as weak as its
weakest point.

On 05/21/2014 03:57 PM, Tavis Ormandy wrote:
> On 21 May 2014 02:13, Project Un1c0rn <project.un1c0rn@...dex.com>
> wrote:
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>> 
>> I really don't get those kind of arguments.
>> 
> 
> It's simple, if your exploit requires Administrator access, then
> it's probably not a security issue. Filesystem ACLs are a
> supported security boundary, being able to defeat them would be a
> legitimate and important vulnerability. Inventing attacks that
> require them to fail as a pre-requisite is like saying "If you can
> modify /etc/passwd, then...".
> 
> Hopefully you agree that using your Administrator access to replace
> or modify system files or settings is not a security issue.
> 
>> If there's a risk that combined with some other flaw that can be 
>> exploited later (dunno, dropping NEW exe in the root for eg.),
>> fix the risk.
> 
> The bug would be being able to defeat filesystem ACLs; if you have
> a way of doing that without Administrator access, you have a
> security bug. That doesn't need to be combined with anything else,
> it's a serious vulnerability.
> 
>> Security is not thinking, naaaah should be ok nobody can touch
>> that dir ... or noooo plain text passwords are OK because my db
>> is on a private network ...
>> 
>> Damn it ... No kidding there's thousands of systems out there 
>> vulnerable because they think cloudflare protects them.
>> 
>> Think for yourself ... Hackers don't take you with one single
>> point of failure, they combine them.
>> 
> 
> Uh, Thanks, I'll keep that in mind.
> 
>> - ---------
>> 
>> Project Un1c0rn http://un1c0rn.net http://unicorntufgvuhbi.onion
>> 
>> On 05/21/2014 06:10 AM, Tavis Ormandy wrote:
>>> "Stefan Kanthak" <stefan.kanthak@...go.de> wrote:
>>> 
>>>> Hi @ll,
>>>> 
>>>> several programs of the current Windows 7 driver software for
>>>> the "HP OfficeJet 6700" multifunction device execute a rogue
>>>> program C:\Program.exe
>>>> 
>>>> 
>>> 
>>> It sounds like a bug, but why is this a security issue? I can
>>> only imagine two possible scenarios
>>> 
>>> 1. You've somehow made the root parition FAT32, in which case 
>>> you're using a non-securable filesystem; Therefore not a
>>> security issue. 2. You've set a bad ACL on the root directory,
>>> therefore user error.
>>> 
>>> If you believe otherwise, please post details, as that would be
>>> an interesting discovery.
>>> 
>>> Tavis.
>>> 
>>> 
>>> _______________________________________________ Sent through
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>>> 
> 
> 
> 

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