Microsoft HTTP.sys RCE Vulnerability (MS15-034) - Active Check

# SPDX-FileCopyrightText: 2015 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

CPE = "cpe:/a:microsoft:internet_information_services";

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.105257");
  script_version("2026-04-28T06:28:06+0000");
  script_tag(name:"last_modification", value:"2026-04-28 06:28:06 +0000 (Tue, 28 Apr 2026)");
  script_tag(name:"creation_date", value:"2015-04-15 18:02:08 +0200 (Wed, 15 Apr 2015)");
  script_tag(name:"cvss_base", value:"10.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:C/I:C/A:C");

  script_cve_id("CVE-2015-1635");

  # nb: Only basic response check, might be not fully reliable in e.g. Proxy environments
  script_tag(name:"qod_type", value:"remote_analysis");

  script_tag(name:"solution_type", value:"VendorFix");

  script_name("Microsoft HTTP.sys RCE Vulnerability (MS15-034) - Active Check");

  script_category(ACT_ATTACK);

  script_copyright("Copyright (C) 2015 Greenbone AG");
  script_family("Web Servers");
  script_dependencies("webmirror.nasl", "gb_microsoft_iis_http_detect.nasl");
  script_require_ports("Services/www", 80);
  script_mandatory_keys("IIS/installed");

  script_tag(name:"summary", value:"This host is missing an important security update according to
  Microsoft Bulletin MS15-034.");

  script_tag(name:"vuldetect", value:"Sends a special crafted HTTP GET request and checks the
  response.");

  script_tag(name:"impact", value:"Successful exploitation will allow remote attackers to run
  arbitrary code in the context of the current user and to perform actions in the security context
  of the current user.");

  script_tag(name:"insight", value:"Flaw exists due to the HTTP protocol stack 'HTTP.sys' that is
  triggered when parsing HTTP requests.");

  script_tag(name:"affected", value:"- Microsoft Windows 8 x32/x64

  - Microsoft Windows 8.1 x32/x64

  - Microsoft Windows Server 2012

  - Microsoft Windows Server 2012 R2

  - Microsoft Windows Server 2008 x32/x64 Service Pack 2 and prior

  - Microsoft Windows 7 x32/x64 Service Pack 1 and prior");

  script_tag(name:"solution", value:"The vendor has released updates. Please see the references for
  more information.");

  script_xref(name:"URL", value:"https://support.microsoft.com/en-us/topic/ms15-034-vulnerability-in-http-sys-could-allow-remote-code-execution-april-14-2015-e8755c1e-c5a8-fa75-c7b1-32087b127850");
  script_xref(name:"URL", value:"https://learn.microsoft.com/en-us/security-updates/SecurityBulletins/2015/ms15-034");
  script_xref(name:"URL", value:"http://pastebin.com/ypURDPc4");
  script_xref(name:"CISA", value:"Known Exploited Vulnerability (KEV) catalog");
  script_xref(name:"URL", value:"https://www.cisa.gov/known-exploited-vulnerabilities-catalog");

  exit(0);
}

include("host_details.inc");
include("http_func.inc");
include("http_keepalive.inc");
include("misc_func.inc");

if( ! port = get_app_port( cpe:CPE, service:"www" ) )
  exit( 0 );

if( ! get_app_location( cpe:CPE, port:port, nofork:TRUE ) )
  exit( 0 );

# nb: This is expected to be here, we're using the same call later to add the port to the host header...
host = http_host_name( dont_add_port:TRUE );

is_iis = FALSE;

# nb: We might have hit the wrong vhost here (limitation of the scanner) so need to check for existence of IIS once more...
#     See as well gb_microsoft_iis_http_detect.nasl for additional remarks
check_urls = make_list( "/vt-test-non-existent.html",
                        "/vt-test/vt-test-non-existent.html",
                        "/vt-test-non-existent.aspx",
                        "/vt-test/vt-test-non-existent.aspx",
                        "/vt-test-non-existent/"
                      );

asp_list = http_get_kb_file_extensions( port:port, host:host, ext:"asp*" );
if( asp_list[0] )
  check_urls = make_list( check_urls, asp_list[0] );

foreach check_url( check_urls ) {
  # nb: Do a new request to avoid wrong cached responses from other vhosts
  req = http_get( port:port, item:check_url );
  res = http_keepalive_send_recv( port:port, data:req );

  if( egrep( string:res, pattern:"^Server\s*:\s*Microsoft", icase:TRUE ) ) {
    is_iis = TRUE;
    break;
  }
}

if( ! is_iis )
  exit( 0 );

known_urls = http_get_kb_file_extensions( port:port, host:host, ext:"*" );
default_urls = make_list( "/",
                          "/welcome.png",
                          "/iis-85.png",
                          "/Iisstart.htm",
                          "/resources/logo.png",
                          "/favicon.ico" );

if( known_urls )
  files = make_list( default_urls, known_urls );
else
  files = default_urls;

checked = 0;

foreach file( files ) {
  headers = make_array( "Range", "bytes=0-18446744073709551615" );

  req = http_get_req( port:port, url:file, add_headers:headers );
  res = http_keepalive_send_recv( port:port, data:req );
  checked++;

  # nb: e.g. https://github.com/zigoo0/MS15-034/blob/master/http-sys.py#L48
  if( "Requested Range Not Satisfiable" >< res || res =~ "^HTTP/1\.[01] 416" ) {
    report = "The response to a crafted HTTP GET request indicates that the host is affected." +
            '\n\nResponse:\n\n' + chomp( res );
    security_message( port:port, data:report );
    exit( 0 );
  }

  if( "request has an invalid header name" >< res )
    exit( 0 );

  if( checked > 20 )
    exit( 99 );
}

exit( 99 );