PunBB IMG Tag Client Side Scripting XSS

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

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

if (description)
{
 script_id(15937);
 script_version("1.20");

 script_bugtraq_id(11850);

 script_name(english:"PunBB IMG Tag Client Side Scripting XSS");

 script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a PHP application that is affected by a
cross-site scripting vulnerability." );
 script_set_attribute(attribute:"description", value:
"The remote version of PunBB is vulnerable to cross-site scripting
flaws because the application does not validate the IMG tag.  With a
specially crafted URL, an attacker can cause arbitrary code execution
within a user's browser, resulting in a loss of integrity." );
 script_set_attribute(attribute:"see_also", value:"http://www.punbb.org/changelogs/1.0_to_1.0.1.txt" );
 script_set_attribute(attribute:"solution", value:
"Update to PunBB version 1.0.1 or later." );
 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: "2004/12/13");
 script_set_attribute(attribute:"vuln_publication_date", value: "2003/08/19");
 script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");
script_set_attribute(attribute:"plugin_type", value:"remote");
script_end_attributes();

 
 summary["english"] = "Checks for PunBB version";
 
 script_summary(english:summary["english"]);
 
 script_category(ACT_GATHER_INFO);
 
 
 script_copyright(english:"This script is Copyright (C) 2004-2021 Tenable Network Security, Inc.");
 
 script_family(english:"CGI abuses : XSS");
 script_dependencie("punBB_detect.nasl");
 script_exclude_keys("Settings/disable_cgi_scanning");
 script_require_ports("Services/www", 80);
 script_require_keys("www/punBB");
 exit(0);
}

#
# The script code starts here
#

include('http_func.inc');

port = get_http_port(default:80, embedded:TRUE);
if (!get_port_state(port)) exit(0);
if (!can_host_php(port:port)) exit(0);

# Test an install.
install = get_kb_item(string("www/", port, "/punBB"));
if (isnull(install)) exit(0);
matches = eregmatch(string:install, pattern:"^(.+) under (/.*)$");
if (!isnull(matches)) {
  ver = matches[1];
  if (egrep(pattern: "^(0\.|1\.0[^.])",string:ver))
  {
    security_warning(port);
    set_kb_item(name: 'www/'+port+'/XSS', value: TRUE);
    exit(0);
  }
}