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Advisory Number : SRT2004-01-17-0425 Product : Ultr@VNC Version : 1.0.0 RC11 (tested) Vendor : http://ultravnc.sourceforge.net/ Class : Local Criticality : High (to Ultr@VNC users) Operating System(s) : Win32
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High Level Description : Ultr@VNC provides local SYSTEM access.
What to do : remove faulty ShellExecute() statements.
Basic Technical Details
Proof Of Concept Status : SNO has Proof of Concept.
Low Level Description : Ultr@VNC is a client/server software that allows you to remotely control a computer over any TCP/IP connection as if you were in front of it. It is Free and distributed under the terms of the GNU General Public License. Ultr@VNC supports Win9x/Me/NT4/Win2000/XP.
[kfinisterre@CloneRiot Ultravnc]$ grep ShellExecute . -rn ./src/ultravnc/winvnc/winvnc/vncmenu.cpp:423: ShellExecute(GetDesktopWindow(), "open", "http://ultravnc.sourceforge.net/help.htm", "", 0, SW_SHOWNORMAL); ./src/ultravnc/winvnc/winvnc/vncmenu.cpp:426: ShellExecute(GetDesktopWindow(), "open", "http://ultravnc.sourceforge.net/index.html", "", 0, SW_SHOWNORMAL); Binary file ./winvnc.exe matches Binary file ./french/winvnc.exe matches
In order to exploit this issue you simply need to right click on the tray icon for Ultr@VNC, select either "Online Help" or "Home Page". You will find that IEXPLORE.EXE is running as SYSTEM. You can simply type in the address bar "C:\WINNT\SYSTEM32" and press enter. Locate cmd.exe and right click on it and selece Open. At this point in time you will have a command prompt running as SYSTEM.
An example of exploitation can be viewed (without registration) at: http://www.secnetops.biz/images/SRT2004-01-17-0425.jpg
Vendor Status : Vendor is working on a fix for this issue. A vendor supplied patch should be supplied in the next release.
Work Around : Comment out the ShellExecute() statements on both line 423 and 426 of vncmenu.cpp. Recompile and reinstall the app.
Bugtraq URL : To be assigned.
This advisory was released by Secure Network Operations,Inc. as a matter of notification to help administrators protect their networks against the described vulnerability. Release of exploit code is done at our own disgression.
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