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Topic: XDMCP

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	XDM(1) manual page
		As XDMCP uses the registered well-known UDP port 177, this resource should not be changed except for debugging.
		When using XDMCP, the display is required to specify the display class, so the manual for your particular X terminal should document the display class string for your device.
		XDMCP provides a more sure mechanism; when xdm closes its initial connection, the session is over and the terminal is required to close all other connections.
	www.xfree86.org /4.0.2/xdm.1.html (0 words)

	The Procedure
		You need to bare this in mind that both X and XDMCP is inherently insecure, and that's why many of the distributions shipped as it's XDMCP default turned off.
		If you must use XDMCP, be sure to use it only in a trusted networks, such as corporate network within a firewall.
		XDMCP connection opens up UDP ports; therefore, it is not natively able to use it with SSH.
	www.tldp.org /HOWTO/XDMCP-HOWTO/procedure.html (2683 words)

	Linux XDMCP HOWTO
		XDMCP stands for "X Display Manager Control Protocol" and is a network protocol.
		Using XDMCP is inherently insecure, therefore, most of the distributions shipped as it's XDMCP default turned off.
		Unfortunately, XDMCP uses UDP port 177 and TCP port 6000; therefore, it is not natively able to use it with SSH.
	www.faqs.org /docs/Linux-HOWTO/XDMCP-HOWTO.html (0 words)

	Remote Sessions via XDMCP (Site not responding. Last check: )
		Cygwin/X can be used login to one or several remote sessions using XDMCP (X Display Manager Control Protocol).
		You may login to several remote sesstions with a single or multiple hosts using XDMCP.
		XDMCP is a complex system that is not specific to Cygwin/X; further discussion of XDMCP is beyond the scope of this document.
	x.cygwin.com /docs/ug/using-remote-session.html (155 words)

	UNIX man pages : xdm ()
		To disable listening for XDMCP connections altogther, a line of LISTEN with no addresses may be specified, or the previously supported method of setting DisplayManager.requestPort to 0 may be used.
		When using XDMCP, the display is required to specify the dis- play class, so the manual for your particular X terminal should docu- ment the display class string for your device.
		XDMCP provides a more sure mechanism; when [4mxdm[0m closes its initial connection, the session is over and the terminal is required to close all other connections.
	www.dac.neu.edu /cgi-bin/man-cgi?xdm (6273 words)

	[No title]
		Xdm provides services similar to those provided by init, getty and login on character terminals: prompting for login name and password, authenticating the user, and running a ``ses- sion.'' A ``session'' is defined by the lifetime of a particular process; in the traditional character-based terminal world, it is the user's login shell.
		To disable listening for XDMCP connections altogther, a line of LISTEN with no addresses may be specified, or the previ- ously supported method of setting DisplayManager.requestPort to 0 may be used.
		XDMCP provides a more sure mechanism; when xdm closes its initial connection, the session is over and the terminal is required to close all other connections.
	ptolemy.eecs.berkeley.edu /cgi-bin/man?xdm (6005 words)

	[No title]
		DisplayManager.accessFile To prevent unauthorized XDMCP service and to allow forwarding of XDMCP IndirectQuery requests, this file contains a database of hostnames which are either allowed direct access to this machine, or have a list of hosts to which queries should be forwarded to.
		When using XDMCP, the dis play is required to specify the display class, so the man ual for your particular X terminal should document the display class string for your device.
		XDMCP provides a more sure mechanism; when xdm closes its initial connection, the session is over and --- the terminal is required to close all other connections.
	www.kaszeta.org /rich/unix/xterminal/xdm.txt (5814 words)

	AntiOnline - xdmcp with rh 8.0
		AltF4 XDMCP is useful to send a X11 login/session to an otherwise "unamanaged" X-server (e.g.
		XDMCP is basically a method of 'broadcasting' the availability of a desktop able to be 'logged into' across a network.
		When you run XDMCP on a machine it allows you to 'load up the desktop' of that machine on another.
	www.antionline.com /printthread.php?threadid=252105&pagenumber=1 (945 words)

	Solaris 2.5.1 OpenWindows man page: xdm(1)
		To prevent unauthorized XDMCP service and to allow forwarding of XDMCP IndirectQuery requests, this file contains a database of hostnames which are either allowed direct access to this machine, or have a list of hosts to which queries should be forwarded to.
		This resource specifies the name of the file to be loaded by xrdb(3) as the resource database onto the root window of screen 0 of the display.
		When using XDMCP, the display is required to specify the display class, so the manual for your particular X terminal should document the display class string for your device.
	www.cae.wisc.edu /manuals/unix-man/solaris-2.5.1/xdm.1.html (4727 words)

	xdm (Linux Reviews)
		To disable listening for XDMCP connections altogther, a line of LISTEN with no addresses may be specified, or the previously supported method of setting DisplayManager.requestPort to 0 may be used.
		When using XDMCP, the display is required to specify the display class, so the manual for your particular X terminal should document the display class string for your device.
		XDMCP provides a more sure mechanism; when xdm closes its initial connection, the session is over and the terminal is required to close all other connections.
	linuxreviews.org /man/xdm (6440 words)

	Linux-Based X Terminals with XDMCP
		XDMCP may be for you, even if you answered yes to even one of these questions.
		The X display manager control protocol (XDMCP for short) provides a means for a user sitting at one (client) computer running X to communicate with another (server) computer running an X display manager.
		Assuming you have not been scared off, to begin configuring XDMCP, be sure the computer to become the X terminal and the one to become the server are connected over your network.
	www.linuxjournal.com /node/6713/print (2473 words)

	xdmcp on win32
		The vncserver is also running on a (the same) M$Windows machine The xdmcp is just used to start it all up: it starts the vncviewer to display on the Xterminal, it (optionially) also starts the vncserver on the M$Windows machine.
		The xdmcp listener gets the ip and display number of the terminal that wants to connect (selected in the xdm chooser).
		The xdmcp starts a local (Wintendo) 1) loginwindow (asking for the vncpasswd) 2) Xviewer with the -display -passwd in a loopback connection The use is special for some embedded terminals, running some kind of unix, but whithout existing Xviewer.
	www.realvnc.com /pipermail/vnc-list/2003-February/037419.html (893 words)

	XDMCP < Ltsp < TWiki
		XDMCP is the last protocol a terminal uses during the boot process.
		Configuring XDMCP is not the same on all servers - it depends on what Display Manager (DM) you are using on your server.
		Once XDMCP is available on your server, any terminals that are already booted to a gray screen should (within a couple minutes) suddenly display a login screen.
	www.ltsp.org /twiki/bin/view/Ltsp/XDMCP (468 words)

	Codingdomain.com: Linux remote access using X11 (Site not responding. Last check: )
		XDMCP is the X11 Display Manager Control Protocol, and provides another way to establish a remote X11 connection.
		XDMCP can be abused easily, and all remote X11 applications use an unencrypted connection to connect to the local display.
		The main advantage of XDMCP is the performance in fast networks, and ability to access the remote login screen.
	www.codingdomain.com /linux/remote/x11 (808 words)

	Tech Note 1229 - Troubleshooting XDMCP Connections to UNIX and Linux Hosts
		The XDMCP protocol is used to communicate between the X Display Manager (XDM) running on a host machine and the X server (Reflection X) running on your workstation (computer).
		To workaround this problem, either use the Direct XDMCP connection; configure your workstation's firewall to permit UDP broadcasts, or contact your network administrator about configuring your router or firewall to permit UDP broadcasts.
		To make an XDMCP connection, the network must be configured to allow the host and X server to communicate using UDP packets over port 177.
	support.wrq.com /techdocs/1229.html (2921 words)

	[No title] (Site not responding. Last check: )
		Security Reminder Using XDMCP is inherently insecure, therefore, most of the distributions shipped as it's XDMCP default turned off.
		Unfortunately, XDMCP uses UDP, not TCP, therefore, it is not natively able to use it with SSH.
		XDMCP and GDM (Gnome Display Manager) The following is taken from the [http://www.oswg.org/oswg-nightly/oswg/ en_US.ISO_8859-1/articles/gdm-reference/gdm-reference/index.html] Gnome Display Manager Reference Manual: GDM also supports the X Display Manager Protocol (XDMCP) for managing remote displays.
	www.myths.com /pub/doc/howto/text/XDMCP-HOWTO (3972 words)

	UNIX man pages : xdm () (Site not responding. Last check: )
		DisplayManager.accessFile To prevent unauthorized XDMCP service and to allow for- warding of XDMCP IndirectQuery requests, this file con- tains a database of hostnames which are either allowed direct access to this machine, or have a list of hosts to which queries should be forwarded to.
		The format of this file is described in the section XDMCP Access Con- trol.
		When using XDMCP, the display is required to specify the display class, so the manual for your partic- ular X terminal should document the display class string for your device.
	www.cs.umbc.edu /cgi-bin/man-cgi?xdm (6010 words)

	Setup Mode - XDMCP Menu
		XDMCP (X Display Manager Control Protocol) is a host-based handshaking protocol to establish a connection with a host and to manage your display.
		But the XDMCP menu also offers the user the option of requesting xdm to control the display, or running without xdm.
		The XDMCP Server Address field shows the IP address of the Direct or Indirect Access host shown in the previous field.
	www.tau.ac.il /cc/internal/X-terminals/5-3-3.html (1026 words)

	ISS X-Force Database: gnome-gdm-bo(4530): gdm buffer overflow in the XDMCP parsing code (Site not responding. Last check: )
		If gdm is configured to use the XDMCP protocol on UDP port 177, a remote attacker overflow a buffer and execute arbitrary code as root.
		In the [xdmcp] section, change the "Enable" variable so that it is set to Enable=0.
		CVE-2000-0491: Buffer overflow in the XDMCP parsing code of GNOME gdm, KDE kdm, and wdm allows remote attackers to execute arbitrary commands or cause a denial of service via a long FORWARD_QUERY request.
	xforce.iss.net /xforce/xfdb/4530 (339 words)

	Tech Note 1818 - Starting a UNIX/Linux Desktop Using XDMCP and SSH
		Using XDMCP, users are unable to start a UNIX/Linux desktop, such as CDE (Common Desktop Environment), over SSH.
		When remotely starting a UNIX/Linux desktop, XDMCP (X Display Manager Control Protocol) is typically used to establish the connection between the host's XDM daemon and the remote X server (Reflection X).
		Attempts to use XDMCP to connect to a host that requires SSH will fail and an error message will be displayed.
	support.wrq.com /techdocs/1818.html (441 words)

	XDMCP
		X is not a very safe protocol for leaving on the net, and XDMCP is even less safe.
		XDMCP is primarily useful for running thin clients such as in terminal labs.
		Those thin clients will only ever need to access the server, and so it seems like the best policy securitywise to have those thin clients on a separate network that cannot be accessed by the outside world, and can only connect to the server.
	www.gnome.org /~shaunm/docs.gnome.org/gdm/2.4.2.100/xdmcp.html (475 words)

	[No title]
		The important security goals in the context of XDMCP are: It should be possible for the display to verify that it is communicating with a legitimate host login service.
		There is the problem (at 1m20m XDMCP X Display Manager Control Protocol least with TCP) that connections may not be closed when the display is turned off.
		As XDMCP will not be used to trans- port large quantities of data, this restriction will not substantially hamper the efficiency of any implementation.
	ftp.x.org /pub/X11R7.0/doc/xdmcp.txt (5240 words)

	Simplifying Remote VNC Logins \| Linux Magazine
		Of course, the XDMCP server must be running for this to work, and that's only likely to be true if your system is configured for GUI logins.
		The simplest XDMCP server to reconfigure is GDM, which is the default for Red Hat and some other distributions.
		At this point, the XDMCP server should be up and running, but you won't be able to make a VNC connection yet.
	www.linux-mag.com /id/1311 (2315 words)

	Happy Pixels » Blog Archive » Using XDMCP with Ubuntu (or any other GDM running distro)
		XDMCP allows users to login graphically to a GUI desktop located on another system.
		I for one use this so that I can utilize the full power of my desktop machine from my crappy laptop, which in turn allows both my wife and I to both use the same computer without conflict (and trust me, two geeks and only one machine definitely leads to conflict!).
		I really wanted to use xdmcp on a boot from the live CD, so rebooting the system after enabling remote login wasn’t an option.
	mparise.wordpress.com /2006/03/01/using-xdmcp-with-ubuntu-or-any-other-gdm-running-distro (747 words)

	[No title]
		Linux XDMCP HOWTO Thomas Chao tomchao@lucent.com Revision History Revision v1.0 1 November 2000 Revised by: tc Initial revision and release.
		Change this: [xdmcp] Enable=0 to: Enable=1 Make sure "Port=177" is at the end of this block.
		XDMCP and GDM (Gnome Display Manager) The following is taken from the [16]Gnome Display Manager Reference Manual: GDM also supports the X Display Manager Protocol (XDMCP) for managing remote displays.
	www.wu-wien.ac.at /manuals/linux-doc1/HOWTO/XDMCP (1497 words)

	[No title]
		Security Reminder Using XDMCP is inherently insecure, therefore, most of the distributions shipped as it's XDMCP default turned off.
		X11 Forwarding using SSH As I have explained earlier, using XDMCP to display X across Internet is basically a no-no, due to it's lack of encryption across the Internet.
		XDMCP and GDM (Gnome Display Manager) The following is taken from the [http://www.oswg.org/oswg-nightly/oswg/ en_US.ISO_8859-1/articles/gdm-reference/gdm-reference/index.html] Gnome Display Manager Reference Manual: GDM also supports the X Display Manager Protocol (XDMCP) for managing remote displays.
	www.ibiblio.org /pub/Linux/docs/HOWTO/XDMCP-HOWTO (4602 words)

	[No title]
		The important security goals in the context of XDMCP are: o It should be possible for the display to verify that it is communicating with a legitimate host login service.
		Overview of the Protocol XDMCP is designed to provide authenticated access to display management services for remote displays.
		There is the problem (at 2 XDMCP X Display Manager Control Protocol least with TCP) that connections may not be closed when the display is turned off.
	ftp.xfree86.org /pub/XFree86/4.5.0/doc/xdmcp.txt (5404 words)

	Commands Reference, Volume 6 - xdm Command
		XDMCP connections dynamically specify which authorization mechanisms are supported, so the authName resource is ignored in this case.
		To control remote terminals that are not using XDMCP, the xdm command searches the window hierarchy on the display and uses the protocol request KillClient in an attempt to clean up the terminal for the next session.
		XDMCP provides a more sure mechanism; when the xdm command closes its initial connection, the session is over and the terminal is required to close all other connections.
	www.ncsa.uiuc.edu /UserInfo/Resources/Hardware/IBMp690/IBM/usr/share/man/info/en_US/a_doc_lib/cmds/aixcmds6/xdm.htm (5279 words)

	Useless services : X Display Manager Control Protocol (XDMCP) (Site not responding. Last check: )
		This protocol is used to provide X display connections for X terminals.
		XDMCP is completely insecure, since the traffic and passwords are not
		Also XDMCP is an additional login mechanism that you may not have been
	www.securityspace.com /smysecure/catid.html?id=10891 (147 words)

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