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

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Message-ID: <CA+YQQ6VRqMuUrRApOncYcqbXQ_JFG+udr7MzNbn_48yV9n2bRQ@mail.gmail.com>
Date: Wed, 21 May 2014 06:57:22 -0700
From: Tavis Ormandy <taviso@...xchg8b.com>
To: Project Un1c0rn <project.un1c0rn@...dex.com>
Cc: fulldisclosure@...lists.org
Subject: Re: [FD] Beginners error: Hewlett-Packards driver software executes
 rogue binary C:\Program.exe

On 21 May 2014 02:13, Project Un1c0rn <project.un1c0rn@...dex.com> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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.
>>
>>
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