MyBB ratethread.php 'rating' Parameter SQLi

2005-09-17T00:00:00
ID MYBB_RATING_SQL_INJECTION.NASL
Type nessus
Reporter Tenable
Modified 2018-06-13T00:00:00

Description

The version of MyBB installed on the remote host is affected by a SQL injection vulnerability due to improper sanitization of user-supplied input to the 'rating' parameter of the ratethread.php script. A remote attacker can exploit this issue to manipulate SQL queries, resulting in the disclosure of sensitive information and modification of data.

                                        
                                            #
# (C) Tenable Network Security, Inc.
#

include("compat.inc");

if (description)
{
  script_id(19716);
  script_version("1.24");
  script_cvs_date("Date: 2018/06/13 18:56:28");

  script_cve_id("CVE-2005-4200");
  script_bugtraq_id(14786);

  script_name(english:"MyBB ratethread.php 'rating' Parameter SQLi");
  script_summary(english:"Checks for rating parameter SQL injection vulnerability in MyBB.");
 
  script_set_attribute(attribute:"synopsis", value:
"The remote web server hosts a PHP application that is affected by a
SQL injection vulnerability.");
  script_set_attribute(attribute:"description", value:
"The version of MyBB installed on the remote host is affected by a SQL
injection vulnerability due to improper sanitization of user-supplied
input to the 'rating' parameter of the ratethread.php script. A remote
attacker can exploit this issue to manipulate SQL queries, resulting
in the disclosure of sensitive information and modification of data.");
  script_set_attribute(attribute:"see_also", value:"http://seclists.org/bugtraq/2005/Dec/285");
  script_set_attribute(attribute:"solution", value:"Enable PHP's 'magic_quotes_gpc' setting.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:H/RL:U/RC:ND");
  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2005/12/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2005/09/17");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:mybb:mybb");
  script_end_attributes();

  script_category(ACT_ATTACK);
  script_family(english:"CGI abuses");
  script_copyright(english:"This script is Copyright (C) 2005-2018 Tenable Network Security, Inc.");

  script_dependencies("mybb_detect.nasl");
  script_require_ports("Services/www", 80);
  script_require_keys("www/PHP", "installed_sw/MyBB");
  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("install_func.inc");

app = "MyBB";
get_install_count(app_name:app, exit_if_zero:TRUE);

port = get_http_port(default:80, php:TRUE);

install = get_single_install(
  app_name : app,
  port     : port
);

dir = install['path'];
install_url = build_url(port:port, qs:dir);

# First we need a thread id.
w = http_send_recv3(
  method : "GET",
  item   : dir + "/index.php",
  port   : port,
  exit_on_fail : TRUE
);
res = w[2];

pat = '<a href="showthread\\.php\\?tid=([0-9]+)&action=lastpost';
matches = egrep(pattern:pat, string:res);
if (matches)
{
  foreach match (split(matches))
  {
    match = chomp(match);
    thread = eregmatch(pattern:pat, string:match);
    if (!empty_or_null(thread))
    {
      tid = thread[1];
      break;
    }
  }
}
if (empty_or_null(tid)) exit(0, "Unable to find a thread id on the " +app+ " install at " + install_url);

# Try to exploit the flaw.
#
# nb: the advisory uses a POST but the code allows for a GET,
#     and that's quicker in a plugin.
script = SCRIPT_NAME;

url = "/ratethread.php?tid=" + tid + "&rating=1'" + script;
w = http_send_recv3(
  method :"GET",
  item   : dir + url,
  port   : port,
  exit_on_fail : TRUE
);
res = w[2];

# There's a problem if we see a syntax error with our script name.
if (
  egrep(
    string:res,
    pattern:"mySQL error: 1064<br>.+near '" +script+ "' .+Query: UPDATE .*threads SET numratings"
  )
)
{
  output = strstr(res, "mySQL error: 1064");
  if (empty_or_null(output)) output = res;

  security_report_v4(
    port       : port,
    severity   : SECURITY_HOLE,
    generic    : TRUE,
    sqli       : TRUE,  # Sets SQLInjection KB key
    request    : make_list(install_url + url),
    output     : chomp(output)
  );
  exit(0);
}
else audit(AUDIT_WEB_APP_NOT_AFFECTED, app, install_url);