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First I would like to assign a special triple FUCK YOU to ASUS- be aware that if you ever buy a ASUS PC you get something where you have to fight the OEM to keep it secure. lets try and do this from my perspective where I describe my mental process when I stumble upon sec fuckup
First a fuck you to asus for abusing the pnp driver system to install crapware! Lets go: Huh? NAME COLLISION, this would have created a folder if not already there.. and it is programdata so default ACL let users writepic.twitter.com/6NdJIkJoak
Yup- it runs as SYSTEM, and its location tell me its installed as a PNP driverpic.twitter.com/Pf4MnoD6C3
Okay... just default inherited ACL, if it was not it would mean there even was a setsecurity to redirect.....pic.twitter.com/ZPwvqYQ2k7
And search recursive what we have write access to as that user:pic.twitter.com/Bymibisnpp
Ok- for exploitability we need a combination of factors: 1 A privileged process do a write/delete/setacl/create operation 2 On a path that we can redirect by making some element in it a junction folder 3 As we dont have delete permissions we need the folder to transform empty
If we find those factors we can redirect a create to a system path. That dont really help us much though- ACL get set on creation so we would end up with the redirected file/folder having default ACL for the folder we redirected to..... Lets get more info:pic.twitter.com/FxSW3GJ7XY
Hmm- lets extract all strings from all files in the driver package:pic.twitter.com/nMoJTwtEWP
Allright, its a standard exe, not a service- if there is not a - in the arguments passed to it on run it will load the file... but what runs that exe then?pic.twitter.com/4OmWqEJDe4
Exe referenced in inf for copy and .cat for signature and then AsusSoftwareManager.exe Again a normal exe file, but it references schedulemanager? Lets have a look if there is something going in tasks maybe....pic.twitter.com/GFrkXbYgGS
Allright, this runs the asushotkeyexec.exe as system ..... But is passed a - as argument, close but no cigar!pic.twitter.com/gMHw7iWEb0
wait- what am I talking about, it was not asushotkeyexec i looked at before, i havent looked at that yet, lets have a look :D
it is windows audio- so chances of it just being random are quite high :D havent seen that crash before though
Hmm- nothing interesting happening with that argument, though the event can trigger god knows what....pic.twitter.com/7et3TZqvWe
Allright, there is plenty privileged attack surface it can trigger... The two processes running as I assume current logged in user(one elevated) are started by the manager service.pic.twitter.com/e76LF2DErY
Add highlight for impersonation! I ran the hotkey task while recording lots of stuff going on, but nothing that screams easily exploitable.... much is very likely exploitable- but i am searching for the lovest hanging fruitpic.twitter.com/nhgEaC9NXL
WTF is it trying to open there? pc....assistant? I dont need no fucking assistance! Oh fuck there is also an uwp app installed- that is just fantasticpic.twitter.com/ZQWSC1V3Fl
HAH! they included idl for their liveupdate RPC https://pastebin.com/raw/Q2pfn9xp
okay its a massive shit show with weibo facebook google auth etc. that enable access to tracking apis claiming you get gifts or something- at least there is also test logins and test urls embeddedpic.twitter.com/mPMnTguygH
I enable the device portal- that is only way i know to run an metro app without having a appx reparse pointpic.twitter.com/6RE3ELln4t
hmmm- i have uninstalled it as my user but it lives on for system and cannot be removed or executed as an user...wtfpic.twitter.com/sjsQ3vuGsn
This is not stupid actually...this way the app have full access out if the uwp sandbox - but there is no gui option to remove it.... fuck you asus- i will document how to do itpic.twitter.com/PMqZ3lZiBv
And the files get kernel protection so not even a driver or any kind of privelegie or user group can tamper with the files....pic.twitter.com/O5QrMTSyJF
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