ARD Agent vulnerability Post: 302207382

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Operating Systems OS X (Apple) ARD Agent vulnerability Post 302207382 by woodgie on Thursday 19th of June 2008 06:05:57 PM

06-19-2008

Registered User

Quote:

Originally Posted by afriend

today an anonymous slashdot user posted this little shell command, that uses the ARDAgent to gain root access, without ever needing to authenticate.

the script is:
osascript -e 'tell app "ARDAgent" to do shell script "whoami"'

Can be used to things like:
osascript -e 'tell app "ARDAgent" to do shell script "scutil --set ComputerName SomeName"'
that would normally require authentication.

It has been tested by quite a few people, and has been found only to work you are physically at a computer and its logged in.

However where I work we use Network Shares as our home folder, and this hack doesnt seem to work. And I just wanted to make sure that there was no way it would work.

When I run the command:
osascript -e 'tell app "ARDAgent" to do shell script "whoami"'

I get:
execution error: ARDAgent got an error: "whoami" doesn't understand the do shell script message. (-1708)

Anyone thinks its possible?

I just tested that on the MacBook Pro I use day to day using an admin account, a normal account and the built in guest account and I have to say...

CRIKEY!

I was hoping maybe it was only a problem if you were logged in as an admin user, but it isn't. I'll test it at work tomorrow when I can get access to my test machines and try it with network clients.

This is really some quite major privilege escalation, it's a built in rootkit.

Thank you very much for bringing that to my attention.

Last edited by woodgie; 06-20-2008 at 06:18 AM.. Reason: Do not use curse words in these forums, no exceptions.

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LEARN ABOUT SUNOS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a	Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.10							    30 Jan 2004 							 script(1)