pLog register.php Multiple Parameter XSS

#%NASL_MIN_LEVEL 70300
#
# (C) Tenable Network Security, Inc.
#

include('deprecated_nasl_level.inc');
include('compat.inc');

if(description)
{
 script_id(16207);
 script_version("1.19");
 script_bugtraq_id(11082);

 script_name(english:"pLog register.php Multiple Parameter XSS"); 
 
 script_set_attribute(attribute:"synopsis", value:
"A remote CGI is vulnerable to cross-site scripting." );
 script_set_attribute(attribute:"description", value:
"The remote host is running pLog, a blogging system written in PHP.

The remote version of this software does not perform a proper validation
of user-supplied input and is, therefore, vulnerable to a cross-site 
scripting attack.

To exploit this flaw, an attacker would need to use the script 
'register.php' to register a user profile containing HTML and script 
code as the attacker's name or blog.

Regular users of the remote website would then display the HTML and/or
script code in their browser when visiting the page 'summary.php'." );
 script_set_attribute(attribute:"solution", value:
"Upgrade to pLog 0.3.3 or newer." );
 script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N");
 script_set_cvss_temporal_vector("CVSS2#E:H/RL:OF/RC:C");
 script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
 script_set_attribute(attribute:"exploit_available", value:"true");
 script_cwe_id(20, 74, 79, 442, 629, 711, 712, 722, 725, 750, 751, 800, 801, 809, 811, 864, 900, 928, 931, 990);

 script_set_attribute(attribute:"plugin_publication_date", value: "2005/01/19");
 script_set_attribute(attribute:"vuln_publication_date", value: "2004/08/31");
 script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();

 script_summary(english:"Checks for the presence of pLog");
 script_category(ACT_GATHER_INFO);
 script_copyright(english:"This script is Copyright (C) 2005-2021 Tenable Network Security, Inc.");
 script_family(english:"CGI abuses : XSS");
 script_dependencie("http_version.nasl", "webmirror.nasl");
 script_require_ports("Services/www", 80);
 script_exclude_keys("Settings/disable_cgi_scanning");
 exit(0);
}

#
# The script code starts here
#
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");

port = get_http_port(default:80);

       
foreach dir ( cgi_dirs() )
{
 u = strcat(dir, "/index.php");
 r = http_send_recv3(method: "GET", port: port, item: u);
 if (isnull(r)) exit(0);

 if (  '<meta name="generator" content="PLOG_0_' >< r[2] )
 {
  if ( egrep(pattern:'<meta name="generator" content="PLOG_0_([0-2]|3_[0-2][^0-9])', string: r[2]) )
  {
	security_warning ( port );
	set_kb_item(name: 'www/'+port+'/XSS', value: TRUE);
  }
 }
}