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Elaminate BACKTRACKS in PERL

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# 1  
Old 03-03-2013
Elaminate BACKTRACKS in PERL
I have the following code and I am trying to use mail command to send email to myself. settings on my server is setup, so I don't need define the "FROM" address.
The main problem is if I use "-T" for tainted mode, this code won't work. any idea how to fix it?
Code:
#!/usr/bin/perl -wT
$ENV{PATH}="/bin:/usr/bin";    # Securing the PATH
#@mail_to = split(/=/, $ENV{QUERY_STRING});
#$mail_to[1] = s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
#$mail_to[1] = tr/+/ /;
### Declare Variables ###
my $incorrectFlag = 0;

# Define REGEX pattern for email field
my %PATTERNS = (
        "email" => '^(([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5}){1,60})$'
);

# GET DATA FROM THE ENVIRONMENT VARIABLE
$qstring = $ENV{'QUERY_STRING'};

# Break data into ARRAY
@pairs = split (/&/, $qstring);

# START A LOOP TO PROCESS FORM DATA
foreach (@pairs) {

#split field name and value on ‘=', store in two scalar variables
($key, $value) = split (/=/);
#translate ‘+' signs back to spaces
$value =~ tr/+/ /;
#translate special character
$value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
#store data in hash
$form{$key} = $value;
}

######### HTML HEADER ##########
print "Content-Type:text/html\n\n";
# Check email format against the pattern
if ($form{address} !~ $PATTERNS{email})
 {
  print " This is a warning! You need to input a proper email address and nothing more!\n";
  $incorrectFlag = 1;
  exit;
 }
else
{
#print $form{address};
$incorrectFlag = 0;
}
'mail -s "message" $form{address} < message.txt';
print "<head><title>Sender</title></head>\n";
print "<body><p>\n";
print "The sender is $form{address}<br />\n";
#print "The Value of QSTRING is:  $qstring\n";
print "</p></body>\n";

# 2  
Old 03-04-2013
Try system. Not sure how it would matter, but still give it a try.
This User Gave Thanks to balajesuri For This Post:
bashily
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