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iPass Mobile Client service local privilege escalation

Title iPass Mobile Client service local privilege escalation
Id MSA-2015-03
Product iPass Mobile Client
Affected versions iPass Mobile Client 2.4.2.15122 (Newer version might be also affected)
Impact medium
Remote no
Product link http://www.ipass.com/laptops/
Reported 11/03/2015
By Hans-Martin Muench (Mogwai, IT-Sicherheitsberatung Muench)

Vendor's Description of the Software:

The iPass Open Mobile client for laptops is lightweight and always on. It provides easy, seamless connectivity across iPass, customer, and third-party networks, and allows you to mix and match carrier networks without disrupting your users.

The iPass Open Mobile client for laptops allows organizations to provide granular options for how employees connect to iPass Wi-Fi (the iPass Mobile Network), campus Wi-Fi, mobile broadband (3G/4G), Ethernet, and dial, using a single platform to manage all connections. Open Mobile also enables cost and security controls that provide virtual private network (VPN) integration options; mobile broadband 3G/4G usage controls for both data roaming and data usage; endpoint integrity verification that checks the security of the device at the point of connection; and several additional options for setting network connection and restriction policies. Insight into an organizations mobility usage is provided through user and device activity and summary reports as well as mobile broadband usage reports.

Vendor response:

"We do not consider this a vulnerability as it is how the product was designed"

Business recommendation:

Disable the iPass service unless really required

CVSS2 Ratings

CVSS Base Score 5.6
Impact Subscore 7.8
Exploitability Subscore 3.9
CVSS v2 Vector (AV:L/AC:L/Au:N/C:P/I:C/A:N)

Vulnerability description

The iPass Open Mobile Windows Client utilizes named pipes for interprocess communication. One of these pipes accepts/forwards commands to the iPass plugin subsystem.

A normal user can communicate with this pipe through the command line client EPCmd.exe which is part of the iPass suite. A list of available commands can be displayed via "System.ListAllCommands".

The iPass pipe provides a "iPass.EventsAction.LaunchAppSysMode" command which allows to execute arbitrary commands as SYSTEM. This can be abused by a normal user to escalate his local privileges.

Please note that this issue can also be exploited remotely in version 2.4.2.15122 as the named pipe can also be called via SMB. However according to our information, the pipe is no longer remotely accessible in current versions of the iPass Mobile client.

Proof of concept:

The following EPCmd command line creates a local user "mogwai" with password "mogwai":

EPCmd.exe iPass.EventsAction.LaunchAppSysMode c:\windows\system32\cmd.exe;"/c net user mogwai mogwai /ADD;;

Disclosure timeline:

10/03/2015 Requesting security contact from iPass sales
10/03/2015 Sales responded, will forward vulnerability information to the development
11/03/2015 Sending vulnerability details
11/03/2015 iPass asks which customer we represent
11/03/2015 Responding that we don't represent any iPass customer
12/03/2015 iPass responded, wont fix, says that the product works as designed

Advisory URL: https://www.mogwaisecurity.de/#lab

Mogwai, IT-Sicherheitsberatung Muench
Steinhoevelstrasse 2/2
89075 Ulm (Germany)

info@mogwaisecurity.de