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Unless you re using shadow passwords, trouble may now be brewing because your password file just got transmitted to the attacker. Even if you re using shadow passwords, just leaking a list of valid user IDs gives the attacker a significant advantage. Of course, with such a vulnerability, a cracker has many options list the contents of your directories looking for files with insecure permissions to attack, gather information about your network configuration, and so on. Windows administrators should note that although this example is Unix-oriented, vulnerabilities just as bad, if not worse, are possible on other platforms. You can avoid problems of this kind by rigorously checking variables transmitted by a client for unwanted characters, such as a semicolon. This is an improved version of the script:

The service provider creates a service in much the same way as a standard application has been built over the years, because a service is essentially a software component written in any desired language. The difference is that the service exposes a certain part of its functionality to the public. The service requestor invokes these public methods by sending a SOAP request. The server may send a SOAP response to the requestor. The service provider must contain an XML parser to interpret SOAP requests and to generate a SOAP response to the consumer. The service provider may use a SOAP toolkit to facilitate this development.

#!/usr/local/bin/perl print "Content-Type: text/html\n\n"; $ENV{'PATH'}="/usr/bin"; $MAILTO = $ENV{'QUERY_STRING'}; $MAILTO =~ s/\+/ /g; # '+' in ' ' convert print "<html><head><title>Test</title></head>"; if($MAILTO =~ tr/;<>*|`&$!#()[]{}: "//) { print "<body><h1>Bogus mail addresses!</h1></body></html>"; exit(1); } print "<body><h1>Mail sent!</h1></body></html>"; open (MAIL,"|mail $MAILTO"); print MAIL "Script was called\n"; close MAIL;

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I ve done two things here. First, I ve specified the PATH variable that determines where the script will look for external programs to /usr/bin only. This is always good programming practice in CGI scripts. An alternative approach would be to replace mail with /usr/bin/mail and set PATH to nothing. This makes it impossible for a script to call an external program without explicitly coding its location. Second, the if clause uses Perl s tr function to detect invalid characters and halts the script if any are found. This is better but still not perfect. You have to be sure that you ve caught every possible character that could cause a problem, which could vary

var req = newXMLHttpRequest(); req.onreadystatechange = getReadyStateHandler(req, update); req.open("POST","<%=request.getContextPath()%>/searchCity.do", true); req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); req.send("getCities="+keyValue); } }

from one script to the next, depending on its purpose. It s far better to check that all characters are valid than look for invalid ones. The following line replaces the if test expression and makes the script more convincingly secure:

if ($MAILTO =~ /[^A-Za-z_0-9@ ]/) {

s Note A SOAP toolkit is essentially an implementation of the SOAP protocol provided by a vendor, such

This uses a match expression to check for any character that isn t (note the negating caret at the start of the list) alphanumeric, a dot, an underscore, or an at sign. If you want to go further, you should check not only whether a variable contains unwanted characters but also whether the variable corresponds exactly to expectations:

function update(cartXML) { var countries = cartXML.getElementsByTagName("cities")[0]; var country = countries.getElementsByTagName("city"); availableSelectList.innerHTML = ''; for (var i = 0; i < country.length ; i++) { var ndValue = country[i].firstChild.nodeValue; availableSelectList.innerHTML += ndValue+"\n"; } } function searchByCountry() { var form = document.forms[0]; alert("This gets the city names"); } </script> <form action="searchCity" id="searchByCityForm"> <table border="0" cellpadding="3" cellspacing="0" width="100%"> <tr>

unless ($MAILTO =~/^\w+@[\w\.]+\.\w+$/) {

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