Microsoft FrontPage Server Extensions (FPSE) Detection (HTTP)
🗓️ 30 Jun 2025 00:00:00Reported by Copyright (C) 2025 Greenbone AGType 
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# SPDX-FileCopyrightText: 2025 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
if (description)
{
script_oid("1.3.6.1.4.1.25623.1.0.119048");
script_version("2025-08-05T05:45:17+0000");
script_tag(name:"last_modification", value:"2025-08-05 05:45:17 +0000 (Tue, 05 Aug 2025)");
script_tag(name:"creation_date", value:"2025-06-30 13:38:43 +0000 (Mon, 30 Jun 2025)");
script_tag(name:"cvss_base", value:"0.0");
script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");
script_tag(name:"qod_type", value:"remote_banner");
script_name("Microsoft FrontPage Server Extensions (FPSE) Detection (HTTP)");
script_tag(name:"summary", value:"HTTP based detection of Microsoft FrontPage Server Extensions
(FPSE).");
script_category(ACT_GATHER_INFO);
script_copyright("Copyright (C) 2025 Greenbone AG");
script_family("Product detection");
# nb: See comment below why the SharePoint Services VT is included here
script_dependencies("gb_microsoft_iis_http_detect.nasl",
"microsoft_windows_sharepoint_services_http_detect.nasl");
script_require_ports("Services/www", 80);
script_mandatory_keys("microsoft/spts_or_iis/http/detected");
script_xref(name:"URL", value:"https://learn.microsoft.com/en-us/openspecs/sharepoint_protocols/mc-fpsewm/e3dc1a47-9510-4ce2-a6be-73fe81aa6adb");
script_xref(name:"URL", value:"https://www.rtr.com/fpsupport/");
exit(0);
}
include("cpe.inc");
include("host_details.inc");
include("http_func.inc");
include("http_keepalive.inc");
include("misc_func.inc");
include("port_service_func.inc");
port = http_get_port( default:443 );
host = http_host_name( dont_add_port:TRUE );
# nb:
# - No get_app_location() as FPSE is just running on top of IIS or other Microsoft products and
# there is no point in linking to the detection of it
# - We have seen some systems exposing the "MicrosoftSharePointTeamServices" banner as well (partly
# also on the /_vti* endpoints only) so it was also included here just to be sure
# - This could be extended in the future / as required with other products known to be able to host
# these services
if( ! get_kb_item( "microsoft/spts_or_iis/http/" + host + "/" + port + "/detected" ) )
exit( 0 );
urls = make_list(
# <title> FrontPage Configuration Information </title>
# <h1>FrontPage Configuration Information </h1>
# <!-- FrontPage Configuration Information
"/_vti_inf.html",
# <HTML><BODY>Cannot run the FrontPage Server Extensions on this page: ""</BODY></HTML>
# <HTML><BODY>Cannot run the FrontPage Server Extensions' Smart HTML interpreter on this non-HTML page: ""</BODY></HTML>
#
# nb: External sources are indicating that:
# - ".dll" is for Windows targets
# - ".exe" is for Linux/Unix targets
"/_vti_bin/shtml.dll",
"/_vti_bin/shtml.exe"
);
concluded = ""; # nb: To make openvas-nasl-lint happy...
foreach url( urls ) {
res = http_get_cache( port:port, item:url );
if( ! res || res !~ "^HTTP/1\.[01] 200" )
continue;
# nb: See examples above
if( concl = egrep( string:res, pattern:"(>[^<]*FrontPage Server Extensions[^<]*<|(>|<!--)\s*FrontPage Configuration Information\s*(<|$))", icase:FALSE ) ) {
# nb: Minor formatting change for the reporting as some of the responses might be included twice
concl_split = split( concl, keep:FALSE );
foreach _concl( concl_split ) {
if( concluded )
concluded += '\n';
_concl = chomp( _concl );
_concl = ereg_replace( string:_concl, pattern:"^(\s+)", replace:"" );
concluded += " " + _concl;
}
conclUrl = " " + http_report_vuln_url( port:port, url:url, url_only:TRUE );
version = "unknown";
install = "/";
found = TRUE;
break;
}
}
if( found ) {
set_kb_item( name:"microsoft/frontpage_server_extensions/detected", value:TRUE );
set_kb_item( name:"microsoft/frontpage_server_extensions/http/detected", value:TRUE );
add_headers = make_array(
"MIME-Version", "4.0",
"X-Vermeer-Content-Type", "application/x-www-form-urlencoded",
"Content-Type", "application/x-www-form-urlencoded"
);
post_data = "method=server+version";
foreach url( urls ) {
if( "/_vti_bin/shtml" >< url ) {
url += "/_vti_rpc";
req = http_post_put_req( port:port, url:url, data:post_data, user_agent:"MSFrontPage/4.0", add_headers:add_headers );
res = http_keepalive_send_recv( port:port, data:req );
}
else if( "/_vti_inf.html" >< url ) {
res = http_get_cache( port:port, item:url );
}
else {
# nb: In case an additional fingerprint URL has been added above which doesn't provide the
# version.
continue;
}
if( ! res || res !~ "^HTTP/1\.[01] 200" )
continue;
# On /_vti_bin/shtml.dll/_vti_rpc:
#
# <html><head><title>vermeer RPC packet</title></head>
# <body>
# <p>method=server version
# <p>server version=
# <ul>
# <li>major ver=5
# <li>minor ver=0
# <li>phase ver=2
# <li>ver incr=6790
# </ul>
# </body>
# </html>
#
# or:
#
# <html><head><title>vermeer RPC packet</title></head>
# <body>
# <p>method=server version
# <p>server version=
# <ul>
# <li>major ver=4
# <li>minor ver=0
# <li>phase ver=2
# <li>ver incr=7802
# </ul>
# </body>
# </html>
#
# On /_vti_inf.html:
#
# FPVersion="5.0.2.6790"
# FPVersion="5.0.2.2623"
# FPVersion="4.0.2.7802"
# FPVersion="4.0.2.5526"
# FPVersion="3.0.2.1706"
if( "/_vti_bin/shtml" >< url ) {
major = eregmatch( pattern:"major ver=([0-9]+)", string:res, icase:FALSE );
minor = eregmatch( pattern:"minor ver=([0-9]+)", string:res, icase:FALSE );
phase = eregmatch( pattern:"phase ver=([0-9]+)", string:res, icase:FALSE );
incr = eregmatch( pattern:"ver incr=([0-9]+)", string:res, icase:FALSE );
if( ! isnull( major[1] ) && ! isnull( minor[1] ) && ! isnull( phase[1] ) && ! isnull( incr[1] ) ) {
version = major[1] + "." + minor[1] + "." + phase[1] + "." + incr[1];
concluded += '\n ' + major[0];
concluded += '\n ' + minor[0];
concluded += '\n ' + phase[0];
concluded += '\n ' + incr[0];
conclUrl += '\n ' + http_report_vuln_url( port:port, url:url, url_only:TRUE ) + " (Note: A special POST request is done)";
break;
}
}
else if( "/_vti_inf.html" >< url ) {
vers = eregmatch( pattern:'FPVersion="([0-9.]+)["^]*"', string:res, icase:FALSE );
if( vers[1] ) {
version = vers[1];
concluded += '\n ' + vers[0];
# nb: Only add if not already there
if( url >!< conclUrl )
conclUrl += '\n ' + http_report_vuln_url( port:port, url:url, url_only:TRUE );
break;
}
}
else {
# nb: In case an additional fingerprint URL has been added above which doesn't provide the
# version.
continue;
}
}
register_and_report_cpe( app:"Microsoft FrontPage Server Extensions (FPSE)",
ver:version,
concluded:concluded,
conclUrl:conclUrl,
base:"cpe:/a:microsoft:frontpage_server_extensions:",
expr:"^([0-9.]+)",
insloc:install,
regService:"www",
regPort:port );
}
exit( 0 );
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05 Aug 2025 00:00Current
7.3High risk
Vulners AI Score7.3