Mac OS Auto-Execution Vulnerability 20
iGawyn writes "As reported in this BugTraq post, Mac OS and Mac OS X (via Classic) are both subject to an auto-execution vulnerability. In short, the poster says that various web browsers can automatically download a disk image containing malicious code and run it without ever telling the user. vm_converter made a test page to demonstrate the vulnerability." Yes, this is a nice variation on a theme. The lesson is: don't ever have "CD-ROM AutoPlay" turned on in your QuickTime preferences.
Auto-Start problems (Score:3, Informative)
This stuff has been going on for ever
Hmm... (Score:1)
(well, yes and what about them?)
First post? So What?
mozzila seems to catch it (Score:2, Informative)
open using stuffit
save this file to disk
;)
:-/
granted, the drive, once mounted, can auto fuck your drive, or the likes, but if you're bright enough to open a drive image that mysteriously appeared, well, i wouldn't say you deserved it, but consider it a lesson well learned
of course, the problem lies with the avg mac user, who won't think to use a non-bundled mac app, like mozilla, or chimera, even though chimera doesn't have download support quite yet.
btw for those of you fearing to try out this security hack, it automounts the exploit_HD_OSX.img onto your drive, which auto opens, and then opens your trash (apple script). too bad the author didn't include a (non autoloading) script that turns off all these vulnerabilites that you could run
Re:mozzila seems to catch it (Score:4, Insightful)
# vm_converter is documentation's author,but not exploit's.
>mozzila (0.9.8) seems to catch it no problem.
"All" mozzila is NOT safe with these vulnerabilites.
When user turn off "Always ask before opening this type of file" checkbox, mozzila catch these problem too.
>too bad the author didn't include a
I want mac users to turn off these vulnerabilites by themselfs (it's easy to do;-), because when another way (ex. very user-friendly archive tools can mount Disk-Image from archive files) to make this vulnerabilites appears, knowledge and experience to these vulnerabilites give correct methods to users.
Thanks for your recommend.
Re:mozzila seems to catch it (Score:2, Insightful)
there's alot of mac sites out there, like lowendmac.com, and others...they all seem to advocate shareware that "GUI-zies" various CLI things, and pretty much don't change any of their settings unless forced to. ie defaulting to apple.netscape.com is a good example of this, and how apple/netscape makes a load of money through banner ads. if i had some more experience with apple script, i'd write my own, but it couldn't hurt to write somthing like that for the CLI/preferences challenged mac user.
thanks again for bringing this security exploit to our (my) attention, somthing i would have (otherwise) learned about the hard way (well, possibly)
How about others? (Score:2, Interesting)
Re:How about others? (Score:1)
It's a shame though; as soon as I find out about them and want to use them, they take them away!
Re:How about others? (Score:1)
Autoplay (Score:3, Informative)
For years now, smart Mac users have left Audio CD and CD-ROM autoplay off, because of a variety of worms that were propagated by those methods.
There was a time back in '98 or so that just about every Zip or CD-R coming back from a service bureau was infected.
Launching arbitrary code (fooling IE into thinking an .app is a .dmg) and autostart worms can be exploited in the same manner.
Microsoft has known about this problem in OS X 10.0 for a while now (it's an IE problem in X, really, as IE is what autolaunches .DMG and .SMI images) the MacOS 10.1/IE 5.1 update supposedly alleviated the hole, FWIF.
The article is speaking about a hole running with a Classic mode browser or running truly under OS 9 -- a variation on the same theme.
If you're concerned about this:
Anyone who sends CD-Rs and Zips out and back in to their machine has no excuse for leaving autostart on, and Apple has no excuse for shipping the OS with those on by default, escpecially with the problems it has caused over the years.
Re:Autoplay (Score:1)
Totally agreed. I just did a clean install of 9.2.2 on a graphite iBook, and I didn't touch those settings, so I went to double-check the default before posting the story. Sure enough, it still defaults to AutoPlay on. Bah.
That's OK, Users & Groups usernames and passwords still aren't encrypted in Mac OS 9, either.
Re:Autoplay (Score:1)
vm_converter
(if you're concerned, read more detailed English document [mac.com])
Isn't every Classic Hole an OSX hole then. (Score:2)
Re:Isn't every Classic Hole an OSX hole then. (Score:1)
Yes. "AutoStart" is the problem of QuickTime in OS 9 or Classic Environment. But, in this vuln, OS X's browsers download malicious compressed disk image in consists of their bug and OS X's Stuffit Expander extracts it and mount it. Only the execution process needs QuickTime in OS 9 or Classic. And, executed malicious programs are treated as OS X's ones finally. So, for example, you can use AppleScript to execute shell script ; Of course, this is an extreme example.
You're an UNIX guy, so you don't need Classic. But please imagine most of all Mac users needs OS 9 or Classic.
I think the lesson is not only "don't ever have "CD-ROM AutoPlay" turned on in your QuickTime preferences. ", but all browser vendors must their products to be disable download without user's agreement and all Mac users is needed to think about the convenient initial settings of applications.
The excessive busybody of vendors induces vulnerabilities. It's not only Windows problem
Re:Isn't every Classic Hole an OSX hole then. (Score:2)
Umm... isn't that just going to ask for a password? A better one that would do almost as much damage, but doesn't require authentication is:
Which would wipe the user's home directory. Nasty!
BTW, can anyone give me one good reason for Apple keeping Autostart support in OS9? After the autostart worms, a lot of users would have turned it off. CD-ROM makers don't make autostart CDs anymore (did they ever?) because they don't know how many users have it on. I've never had a CD Autostart (yes, I was careful. I checked for the worm prior to testing). So why didn't Apple drop it from OS9?
I think (Score:4, Interesting)
Auto-play...hmph...What about Applescript? (Score:1)