Re: Beginners error: Hewlett-Packards driver software executes rogue binary C:\Program.exe

[Project Un1c0rn <project.un1c0rn () yandex com>]

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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 () yandex 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 () nexgo 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
> > > the Full Disclosure mailing list 
> > > http://nmap.org/mailman/listinfo/fulldisclosure Web Archives &
> > > RSS: http://seclists.org/fulldisclosure/

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