Vulnerabilities > CVE-2009-1535 - Improper Authentication vulnerability in Microsoft Internet Information Services 5.1/6.0

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1535
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1122

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1535
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1122

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


include("compat.inc");


if (description)
{
  script_id(39342);
  script_version("1.30");
  script_cvs_date("Date: 2018/11/15 20:50:30");

  script_cve_id("CVE-2009-1122", "CVE-2009-1535");
  script_bugtraq_id(34993);
  script_xref(name:"MSFT", value:"MS09-020");
  script_xref(name:"MSKB", value:"970483");
  script_xref(name:"EDB-ID", value:"8704");

  script_name(english:"MS09-020: Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege (970483)");
  script_summary(english:"Checks version of Httpext.dll");

  script_set_attribute(attribute:"synopsis", value:"It is possible to bypass authentication on the remote web server.");
  script_set_attribute(attribute:"description", value:
"Due to a flaw in the WebDAV extension for IIS, an anonymous, remote
attacker may be able to bypass authentication by sending a specially
crafted HTTP request and gain access to a protected location.");
  script_set_attribute(attribute:"see_also", value:"https://docs.microsoft.com/en-us/security-updates/SecurityBulletins/2009/ms09-020");
  script_set_attribute(attribute:"solution", value:"Microsoft has released a set of patches for Windows 2000, XP and 2003.");
  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:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(287);

  script_set_attribute(attribute:"vuln_publication_date", value:"2009/05/15");
  script_set_attribute(attribute:"patch_publication_date", value:"2009/06/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2009/06/10");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:microsoft:windows");
  script_set_attribute(attribute:"cpe", value:"cpe:/a:microsoft:iis");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Windows : Microsoft Bulletins");

  script_copyright(english:"This script is Copyright (C) 2009-2018 Tenable Network Security, Inc.");

  script_dependencies("smb_hotfixes.nasl", "ms_bulletin_checks_possible.nasl");
  script_require_keys("SMB/MS_Bulletin_Checks/Possible");
  script_require_ports(139, 445, 'Host/patch_management_checks');

  exit(0);
}


include("audit.inc");
include("smb_func.inc");
include("smb_hotfixes.inc");
include("smb_hotfixes_fcheck.inc");
include("misc_func.inc");

get_kb_item_or_exit("SMB/MS_Bulletin_Checks/Possible");

bulletin = 'MS09-020';
kb = "970483";

kbs = make_list(kb);
if (get_kb_item("Host/patch_management_checks")) hotfix_check_3rd_party(bulletin:bulletin, kbs:kbs, severity:SECURITY_HOLE);


get_kb_item_or_exit("SMB/Registry/Enumerated");
get_kb_item_or_exit("SMB/WindowsVersion", exit_code:1);

if (hotfix_check_sp_range(win2k:'4,5', xp:'2,3', win2003:'2') <= 0) audit(AUDIT_OS_SP_NOT_VULN);
if (hotfix_check_iis_installed() <= 0) audit(AUDIT_NOT_INST, "IIS");

rootfile = hotfix_get_systemroot();
if (!rootfile) exit(1, "Failed to get the system root.");

share = hotfix_path2share(path:rootfile);
if (!is_accessible_share(share:share)) audit(AUDIT_SHARE_FAIL, share);

if (
  # Windows 2003
  hotfix_is_vulnerable(os:"5.2", sp:2, file:"Httpext.dll", version:"6.0.3790.4518", dir:"\system32\inetsrv", bulletin:bulletin, kb:kb) ||

  # Windows XP
  hotfix_is_vulnerable(os:"5.1", sp:3, file:"Httpext.dll", version:"6.0.2600.5817", dir:"\system32\inetsrv", bulletin:bulletin, kb:kb) ||
  hotfix_is_vulnerable(os:"5.1", sp:2, file:"Httpext.dll", version:"6.0.2600.3574", dir:"\system32\inetsrv", bulletin:bulletin, kb:kb) ||

  # Windows 2000
  hotfix_is_vulnerable(os:"5.0", file:"Httpext.dll", version:"5.0.2195.7290", dir:"\system32\inetsrv", bulletin:bulletin, kb:kb)
)
{
  set_kb_item(name:"SMB/Missing/"+bulletin, value:TRUE);
  hotfix_security_hole();
  hotfix_check_fversion_end();
  exit(0);
}
else
{
  hotfix_check_fversion_end();
  audit(AUDIT_HOST_NOT, 'affected');
}

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

include("compat.inc");

if(description)
{
 script_id(38808);
 script_version ("1.21");

 script_cve_id("CVE-2009-1535");
 script_bugtraq_id(34993);
 script_xref(name: "AUSCERT", value: "AL-2009.0041");
 script_xref(name: "CERTA", value: "CERTA-2009-ALE-007");
 script_xref(name: "CERT-FI", value: "038/2009");
 script_xref(name: "EDB-ID", value: "8704");

 script_name(english:"Microsoft IIS WebDAV Unicode Request Directory Security Bypass");
 script_summary(english: "Circumvent IIS 6.0 access control with WebDAV");

 script_set_attribute(attribute:"synopsis", value:
"It is possible to access protected resources through WebDAV." );
 script_set_attribute(attribute:"description", value:
"IIS 6.0 does not properly sanitize WebDAV requests.  It is possible
to access protected resources by inserting a Unicode / (%c0%af) in the
URL. 

Depending on the remote server configuration, protected resources may
be browsed, read and/or modified." );
 script_set_attribute(attribute:"see_also", value: "http://blog.zoller.lu/2009/05/iis-6-webdac-auth-bypass-and-data.html");
 script_set_attribute(attribute:"see_also", value: "http://www.nessus.org/u?36818b28");
 script_set_attribute(attribute:"see_also", value: "http://www.nessus.org/u?5fefdfc0");
 script_set_attribute(attribute:"see_also", value: "https://isc.sans.edu/diary/IIS6.0+WebDav+Remote+Auth+Bypass/6397");
 script_set_attribute(attribute:"see_also", value: "https://docs.microsoft.com/en-us/security-updates/SecurityAdvisories/2009/971492");
 script_set_attribute(attribute:"see_also", value: "http://unixwiz.net/techtips/ms971492-webdav-vuln.html");
 script_set_attribute(attribute:"see_also", value: "https://forums.iis.net/t/1149348.aspx");
 script_set_attribute(attribute:"solution", value:
"Disable WebDAV or update the server.");
  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:POC/RL:OF/RC:C");
  script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"true");
script_cwe_id(287);
 script_set_attribute(attribute:"plugin_publication_date", value: "2009/05/18");
 script_cvs_date("Date: 2018/11/15 20:50:26");
 script_set_attribute(attribute:"plugin_type", value:"remote");
 script_end_attributes();

 script_category(ACT_ATTACK); 
 script_copyright(english:"This script is Copyright (C) 2009-2018 Tenable Network Security, Inc.");
 script_family(english: "Web Servers");

 script_dependencie("http_version.nasl", 
  "webmirror.nasl", 
  "http_version.nasl", 
  "DDI_Directory_Scanner.nasl", 
  "no404.nasl", 
  "webdav_enabled.nasl"
 );
 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");

port = get_http_port(default:80);

if (report_paranoia < 1)
{
  banner = get_http_banner(port: port);
  if ("Microsoft-IIS/" >!< banner) exit(0);
}

# We could check www/PORT/webdav but WebDAV may be enabled only for some directories

prot_url_l = get_kb_list("www/"+port+"/content/basic_auth/url/*");

if (! isnull(prot_url_l))
{
  prot_url_l = make_list(prot_url_l);
  for (i = 0; ! isnull(prot_url_l[i]); i ++)
  {
    # Make sure that the page requires authentication
    r = http_send_recv3(method: "GET", item: prot_url_l[i], port: port);
    if (isnull(r)) exit(0);
    if (r[0] !~ "^HTTP/1\.[01] 401 ") continue;

    h = make_array("Translate", "f");
    u = "/..%c0%af" + prot_url_l[i];

    r = http_send_recv3(method: "GET", port: port, item: u);
    if (isnull(r)) exit(0);
    if (r[0] =~ "^HTTP/1\.[01] 200 ") break;

    r = http_send_recv3(method: "GET", port: port, item: u, add_headers: h);
    if (isnull(r)) exit(0);
    if (r[0] =~ "^HTTP/1\.[01] 200 ")
    {
      security_hole(port);
      exit(0);
    }
    break;
  }
}

prot_dir_l = get_kb_list("www/"+port+"/content/directories/auth_required");
if (! isnull(prot_dir_l))
{
  xml = 
'<?xml version="1.0" encoding="utf-8"?>\r\n'+
'<propfind xmlns="DAV:"><prop>\r\n' +
'<getcontentlength xmlns="DAV:"/>\r\n'+
'<getlastmodified xmlns="DAV:"/>\r\n' +
'<executable xmlns="http://apache.org/dav/props/"/>\r\n' +
'<resourcetype xmlns="DAV:"/>\r\n' +
'<checked-in xmlns="DAV:"/>\r\n' +
'<checked-out xmlns="DAV:"/>\r\n' +
'</prop></propfind>\r\n';

  h = make_array( "Depth", "1", 
      		  "Connection", "TE", 
		  "TE", "trailers",
		  "Content-Type", "application/xml" );

  prot_dir_l = make_list(prot_dir_l);
  dir = NULL;
  for (i = 0; ! isnull(prot_dir_l[i]); i ++)
    if (strlen(prot_dir_l[i]) > 2)
    {
      # Make sure the page requires authentication
      r = http_send_recv3(method: "PROPFIND", item: prot_dir_l[i], port: port,
      	add_headers: h, data: xml);
      if (isnull(r)) exit(0);
      if (r[0] !~ "^HTTP/1\.[01] 401 ") continue;

      dir = strcat(substr(prot_dir_l[i], 0, 1), "%c0%af", substr(prot_dir_l[i], 2));
      break;
    }
  if (isnull(dir)) exit(0);

  r = http_send_recv3(port: port, method: "PROPFIND", item: dir,
    add_headers: h, data: xml );
  if (isnull(r)) exit(0);

  if ( r[0] =~ "^HTTP/1\.[01] 200 " ||
      (r[0] =~ "^HTTP/1\.[01] 207 " && "<a:status>HTTP/1.1 200 OK</a:status>" >< r[2]))
  {
    if (report_verbosity < 1)
      security_hole(port);
    else
    {
      if (report_verbosity == 1)
        extra = strcat('The following HTTP request got a 20x code instead of 401 :\n\n', http_last_sent_request());
      else
        extra = strcat('The following HTTP request :\n----------\n\n', http_last_sent_request(), '\n--------\nproduced this output :\n\n', r[0], r[1], '\n', r[2], '\n');
      security_hole(port:port, extra: extra);
    }
  }
}