CVE-2017-9064 (published 2017-05-18T14:29Z)

In WordPress before 4.7.5, a Cross Site Request Forgery (CSRF) vulnerability exists in the filesystem credentials dialog because a nonce is not required for updating credentials.

Severity: MEDIUM
CVSS v2 base score: 6.8 (AV:N/AC:M/Au:N/C:P/I:P/A:P)
CVSS v3 base score: 8.8, HIGH (CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)

Weakness information:
cwe_id: CWE-352
cwe_name: Cross-Site Request Forgery (CSRF)
description: The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.
extended_description: When a web server is designed to receive a request from a client without any mechanism for verifying that it was intentionally sent, then it might be possible for an attacker to trick a client into making an unintentional request to the web server which will be treated as an authentic request. This can be done via a URL, image load, XMLHttpRequest, etc. and can result in exposure of data or unintended code execution.
         

Fix information:
repo_url: https://github.com/WordPress/WordPress
commit_details: repo_url: https://github.com/WordPress/WordPress
author: Aaron Campbell
author_date: 2017-05-16 14:48:44+00:00
msg: Add nonce for updating file system credentials.
Built from https://develop.svn.wordpress.org/trunk@40723


git-svn-id: http://core.svn.wordpress.org/trunk@40581 1a063a9b-81f0-0310-95a4-ce76da25c4cd
repository: repo_url: https://github.com/WordPress/WordPress
repo_name: WordPress/WordPress
description: WordPress, Git-ified. This repository is just a mirror of the WordPress subversion repository. Please do not send pull requests. Submit pull requests to https://github.com/WordPress/wordpress-develop and patches to https://core.trac.wordpress.org/ instead.
repo_language: PHP
owner: WordPress
file_changes: filename: file.php
change_type: ModificationType.MODIFY
diff: @@ -1091,14 +1091,28 @@ function request_filesystem_credentials( $form_post, $type = '', $error = false,
 
 	$credentials = get_option('ftp_credentials', array( 'hostname' => '', 'username' => ''));
 
+	$submitted_form = wp_unslash( $_POST );
+
+	// Verify nonce, or unset submitted form field values on failure
+	if ( ! isset( $_POST['_fs_nonce'] ) || ! wp_verify_nonce( $_POST['_fs_nonce'], 'filesystem-credentials' ) ) {
+		unset(
+			$submitted_form['hostname'],
+			$submitted_form['username'],
+			$submitted_form['password'],
+			$submitted_form['public_key'],
+			$submitted_form['private_key'],
+			$submitted_form['connection_type']
+		);
+	}
+
 	// If defined, set it to that, Else, If POST'd, set it to that, If not, Set it to whatever it previously was(saved details in option)
-	$credentials['hostname'] = defined('FTP_HOST') ? FTP_HOST : (!empty($_POST['hostname']) ? wp_unslash( $_POST['hostname'] ) : $credentials['hostname']);
-	$credentials['username'] = defined('FTP_USER') ? FTP_USER : (!empty($_POST['username']) ? wp_unslash( $_POST['username'] ) : $credentials['username']);
-	$credentials['password'] = defined('FTP_PASS') ? FTP_PASS : (!empty($_POST['password']) ? wp_unslash( $_POST['password'] ) : '');
+	$credentials['hostname'] = defined('FTP_HOST') ? FTP_HOST : (!empty($submitted_form['hostname']) ? $submitted_form['hostname'] : $credentials['hostname']);
+	$credentials['username'] = defined('FTP_USER') ? FTP_USER : (!empty($submitted_form['username']) ? $submitted_form['username'] : $credentials['username']);
+	$credentials['password'] = defined('FTP_PASS') ? FTP_PASS : (!empty($submitted_form['password']) ? $submitted_form['password'] : '');
 
 	// Check to see if we are setting the public/private keys for ssh
-	$credentials['public_key'] = defined('FTP_PUBKEY') ? FTP_PUBKEY : (!empty($_POST['public_key']) ? wp_unslash( $_POST['public_key'] ) : '');
-	$credentials['private_key'] = defined('FTP_PRIKEY') ? FTP_PRIKEY : (!empty($_POST['private_key']) ? wp_unslash( $_POST['private_key'] ) : '');
+	$credentials['public_key'] = defined('FTP_PUBKEY') ? FTP_PUBKEY : (!empty($submitted_form['public_key']) ? $submitted_form['public_key'] : '');
+	$credentials['private_key'] = defined('FTP_PRIKEY') ? FTP_PRIKEY : (!empty($submitted_form['private_key']) ? $submitted_form['private_key'] : '');
 
 	// Sanitize the hostname, Some people might pass in odd-data:
 	$credentials['hostname'] = preg_replace('|\w+://|', '', $credentials['hostname']); //Strip any schemes off
@@ -1115,8 +1129,8 @@ function request_filesystem_credentials( $form_post, $type = '', $error = false,
 		$credentials['connection_type'] = 'ssh';
 	} elseif ( ( defined( 'FTP_SSL' ) && FTP_SSL ) && 'ftpext' == $type ) { //Only the FTP Extension understands SSL
 		$credentials['connection_type'] = 'ftps';
-	} elseif ( ! empty( $_POST['connection_type'] ) ) {
-		$credentials['connection_type'] = wp_unslash( $_POST['connection_type'] );
+	} elseif ( ! empty( $submitted_form['connection_type'] ) ) {
+		$credentials['connection_type'] = $submitted_form['connection_type'];
 	} elseif ( ! isset( $credentials['connection_type'] ) ) { //All else fails (And it's not defaulted to something else saved), Default to FTP
 		$credentials['connection_type'] = 'ftp';
 	}
@@ -1255,11 +1269,12 @@ if ( isset( $types['ssh'] ) ) {
 }
 
 foreach ( (array) $extra_fields as $field ) {
-	if ( isset( $_POST[ $field ] ) )
-		echo '<input type="hidden" name="' . esc_attr( $field ) . '" value="' . esc_attr( wp_unslash( $_POST[ $field ] ) ) . '" />';
+	if ( isset( $submitted_form[ $field ] ) )
+		echo '<input type="hidden" name="' . esc_attr( $field ) . '" value="' . esc_attr( $submitted_form[ $field ] ) . '" />';
 }
 ?>
 	<p class="request-filesystem-credentials-action-buttons">
+		<?php wp_nonce_field( 'filesystem-credentials', '_fs_nonce', false, true ); ?>
 		<button class="button cancel-button" data-js-action="close" type="button"><?php _e( 'Cancel' ); ?></button>
 		<?php submit_button( __( 'Proceed' ), '', 'upgrade', false ); ?>
 	</p>

programming_language: PHP
filename: updates.js
change_type: ModificationType.MODIFY
diff: @@ -94,6 +94,7 @@
 	 * @type {object} filesystemCredentials.ssh                Holds SSH credentials.
 	 * @type {string} filesystemCredentials.ssh.publicKey      The public key. Default empty string.
 	 * @type {string} filesystemCredentials.ssh.privateKey     The private key. Default empty string.
+	 * @type {string} filesystemCredentials.fsNonce            Filesystem credentials form nonce.
 	 * @type {bool}   filesystemCredentials.available          Whether filesystem credentials have been provided.
 	 *                                                         Default 'false'.
 	 */
@@ -108,6 +109,7 @@
 			publicKey:  '',
 			privateKey: ''
 		},
+		fsNonce: '',
 		available: false
 	};
 
@@ -225,6 +227,7 @@
 		options.data = _.extend( data, {
 			action:          action,
 			_ajax_nonce:     wp.updates.ajaxNonce,
+			_fs_nonce:       wp.updates.filesystemCredentials.fsNonce,
 			username:        wp.updates.filesystemCredentials.ftp.username,
 			password:        wp.updates.filesystemCredentials.ftp.password,
 			hostname:        wp.updates.filesystemCredentials.ftp.hostname,
@@ -1706,6 +1709,7 @@
 			wp.updates.filesystemCredentials.ftp.connectionType = $( 'input[name="connection_type"]:checked' ).val();
 			wp.updates.filesystemCredentials.ssh.publicKey      = $( '#public_key' ).val();
 			wp.updates.filesystemCredentials.ssh.privateKey     = $( '#private_key' ).val();
+			wp.updates.filesystemCredentials.fsNonce            = $( '#_fs_nonce' ).val();
 			wp.updates.filesystemCredentials.available          = true;
 
 			// Unlock and invoke the queue.

programming_language: JavaScript
filename: updates.min.js
change_type: ModificationType.MODIFY
diff: @@ -1,2 +1,2 @@
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\ No newline at end of file
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a;if(!b.updates.ajaxLocked&&b.updates.queue.length)switch(a=b.updates.queue.shift(),a.action){case"install-plugin":b.updates.installPlugin(a.data);break;case"update-plugin":b.updates.updatePlugin(a.data);break;case"delete-plugin":b.updates.deletePlugin(a.data);break;case"install-theme":b.updates.installTheme(a.data);break;case"update-theme":b.updates.updateTheme(a.data);break;case"delete-theme":b.updates.deleteTheme(a.data)}},b.updates.requestFilesystemCredentials=function(c){!1===b.updates.filesystemCredentials.available&&(c&&!b.updates.$elToReturnFocusToFromCredentialsModal&&(b.updates.$elToReturnFocusToFromCredentialsModal=a(c.target)),b.updates.ajaxLocked=!0,b.updates.requestForCredentialsModalOpen())},b.updates.maybeRequestFilesystemCredentials=function(a){b.updates.shouldRequestFilesystemCredentials&&!b.updates.ajaxLocked&&b.updates.requestFilesystemCredentials(a)},b.updates.keydown=function(c){27===c.keyCode?b.updates.requestForCredentialsModalCancel():9===c.keyCode&&("upgrade"!==c.target.id||c.shiftKey?"hostname"===c.target.id&&c.shiftKey&&(a("#upgrade").focus(),c.preventDefault()):(a("#hostname").focus(),c.preventDefault()))},b.updates.requestForCredentialsModalOpen=function(){var c=a("#request-filesystem-credentials-dialog");a("body").addClass("modal-open"),c.show(),c.find("input:enabled:first").focus(),c.on("keydown",b.updates.keydown)},b.updates.requestForCredentialsModalClose=function(){a("#request-filesystem-credentials-dialog").hide(),a("body").removeClass("modal-open"),b.updates.$elToReturnFocusToFromCredentialsModal&&b.updates.$elToReturnFocusToFromCredentialsModal.focus()},b.updates.requestForCredentialsModalCancel=function(){(b.updates.ajaxLocked||b.updates.queue.length)&&(_.each(b.updates.queue,function(a){d.trigger("credential-modal-cancel",a)}),b.updates.ajaxLocked=!1,b.updates.queue=[],b.updates.requestForCredentialsModalClose())},b.updates.showErrorInCredentialsForm=function(b){var c=a("#request-filesystem-credentials-form");c.find(".notice").remove(),c.find("#request-filesystem-credentials-title").after('<div class="notice notice-alt 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c.readyState&&0===c.readyState?f=b.updates.l10n.connectionError:_.isString(c.responseText)&&""!==c.responseText?f=c.responseText:_.isString(c.statusText)&&(f=c.statusText),d){case"update":e=b.updates.l10n.updateFailed;break;case"install":e=b.updates.l10n.installFailed;break;case"delete":e=b.updates.l10n.deleteFailed}return f=f.replace(/<[\/a-z][^<>]*>/gi,""),e=e.replace("%s",f),b.updates.addAdminNotice({id:"unknown_error",className:"notice-error is-dismissible",message:_.escape(e)}),b.updates.ajaxLocked=!1,b.updates.queue=[],a(".button.updating-message").removeClass("updating-message").removeAttr("aria-label").prop("disabled",!0).text(b.updates.l10n.updateFailedShort),a(".updating-message:not(.button):not(.thickbox)").removeClass("updating-message notice-warning").addClass("notice-error").find("p").removeAttr("aria-label").text(e),b.a11y.speak(e,"assertive"),!1},b.updates.beforeunload=function(){if(b.updates.ajaxLocked)return b.updates.l10n.beforeunload},a(function(){var e=a("#plugin-filter"),f=a("#bulk-action-form"),g=a("#request-filesystem-credentials-form"),h=a("#request-filesystem-credentials-dialog"),i=a(".plugins-php .wp-filter-search"),j=a(".plugin-install-php 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d=a(c.target);c.preventDefault(),d.hasClass("updating-message")||d.hasClass("button-disabled")||(b.updates.maybeRequestFilesystemCredentials(c),b.updates.updatePlugin({plugin:d.data("plugin"),slug:d.data("slug")}))}),e.on("click",".install-now",function(c){var e=a(c.target);c.preventDefault(),e.hasClass("updating-message")||e.hasClass("button-disabled")||(b.updates.shouldRequestFilesystemCredentials&&!b.updates.ajaxLocked&&(b.updates.requestFilesystemCredentials(c),d.on("credential-modal-cancel",function(){var c=a(".install-now.updating-message");c.removeClass("updating-message").text(b.updates.l10n.installNow),b.a11y.speak(b.updates.l10n.updateCancel,"polite")})),b.updates.installPlugin({slug:e.data("slug")}))}),d.on("click",".importer-item .install-now",function(c){var e=a(c.target),f=a(this).data("name");c.preventDefault(),e.hasClass("updating-message")||(b.updates.shouldRequestFilesystemCredentials&&!b.updates.ajaxLocked&&(b.updates.requestFilesystemCredentials(c),d.on("credential-modal-cancel",function(){e.removeClass("updating-message").text(b.updates.l10n.installNow).attr("aria-label",b.updates.l10n.installNowLabel.replace("%s",f)),b.a11y.speak(b.updates.l10n.updateCancel,"polite")})),b.updates.installPlugin({slug:e.data("slug"),pagenow:pagenow,success:b.updates.installImporterSuccess,error:b.updates.installImporterError}))}),f.on("click","[data-plugin] a.delete",function(c){var d=a(c.target).parents("tr");c.preventDefault(),window.confirm(b.updates.l10n.aysDeleteUninstall.replace("%s",d.find(".plugin-title strong").text()))&&(b.updates.maybeRequestFilesystemCredentials(c),b.updates.deletePlugin({plugin:d.data("plugin"),slug:d.data("slug")}))}),d.on("click",".themes-php.network-admin .update-link",function(c){var d=a(c.target),e=d.parents("tr");c.preventDefault(),d.hasClass("updating-message")||d.hasClass("button-disabled")||(b.updates.maybeRequestFilesystemCredentials(c),b.updates.$elToReturnFocusToFromCredentialsModal=e.find(".check-column input"),b.updates.updateTheme({slug:e.data("slug")}))}),d.on("click",".themes-php.network-admin a.delete",function(c){var d=a(c.target).parents("tr");c.preventDefault(),window.confirm(b.updates.l10n.aysDelete.replace("%s",d.find(".theme-title strong").text()))&&(b.updates.maybeRequestFilesystemCredentials(c),b.updates.deleteTheme({slug:d.data("slug")}))}),f.on("click",'[type="submit"]',function(c){var e,g,h=a(c.target).siblings("select").val(),i=f.find('input[name="checked[]"]:checked'),j=0,k=0,l=[];switch(pagenow){case"plugins":case"plugins-network":e="plugin";break;case"themes-network":e="theme";break;default:return}if(!i.length)return c.preventDefault(),a("html, body").animate({scrollTop:0}),b.updates.addAdminNotice({id:"no-items-selected",className:"notice-error is-dismissible",message:b.updates.l10n.noItemsSelected});switch(h){case"update-selected":g=h.replace("selected",e);break;case"delete-selected":if(!window.confirm("plugin"===e?b.updates.l10n.aysBulkDelete:b.updates.l10n.aysBulkDeleteThemes))return void c.preventDefault();g=h.replace("selected",e);break;default:return}b.updates.maybeRequestFilesystemCredentials(c),c.preventDefault(),f.find('.manage-column [type="checkbox"]').prop("checked",!1),d.trigger("wp-"+e+"-bulk-"+h,i),i.each(function(c,d){var e=a(d),f=e.parents("tr");return"update-selected"!==h||f.hasClass("update")&&!f.find("notice-error").length?void b.updates.queue.push({action:g,data:{plugin:f.data("plugin"),slug:f.data("slug")}}):void e.prop("checked",!1)}),d.on("wp-plugin-update-success wp-plugin-update-error wp-theme-update-success wp-theme-update-error",function(c,d){var e,f,g=a('[data-slug="'+d.slug+'"]');"wp-"+d.update+"-update-success"===c.type?j++:(f=d.pluginName?d.pluginName:g.find(".column-primary strong").text(),k++,l.push(f+": "+d.errorMessage)),g.find('input[name="checked[]"]:checked').prop("checked",!1),b.updates.adminNotice=b.template("wp-bulk-updates-admin-notice"),b.updates.addAdminNotice({id:"bulk-action-notice",className:"bulk-action-notice",successes:j,errors:k,errorMessages:l,type:d.update}),e=a("#bulk-action-notice").on("click","button",function(){a(this).toggleClass("bulk-action-errors-collapsed").attr("aria-expanded",!a(this).hasClass("bulk-action-errors-collapsed")),e.find(".bulk-action-errors").toggleClass("hidden")}),k>0&&!b.updates.queue.length&&a("html, body").animate({scrollTop:0})}),d.on("wp-updates-notice-added",function(){b.updates.adminNotice=b.template("wp-updates-admin-notice")}),b.updates.queueChecker()}),j.length&&j.attr("aria-describedby","live-search-desc"),j.on("keyup input",_.debounce(function(c,d){var f,g,h=a(".plugin-install-search");f={_ajax_nonce:b.updates.ajaxNonce,s:c.target.value,tab:"search",type:a("#typeselector").val(),pagenow:pagenow},g=location.href.split("?")[0]+"?"+a.param(_.omit(f,["_ajax_nonce","pagenow"])),"keyup"===c.type&&27===c.which&&(c.target.value=""),b.updates.searchTerm===f.s&&"typechange"!==d||(e.empty(),b.updates.searchTerm=f.s,window.history&&window.history.replaceState&&window.history.replaceState(null,"",g),h.length||(h=a('<li class="plugin-install-search" />').append(a("<a />",{"class":"current",href:g,text:b.updates.l10n.searchResultsLabel})),a(".wp-filter .filter-links .current").removeClass("current").parents(".filter-links").prepend(h),e.prev("p").remove(),a(".plugins-popular-tags-wrapper").remove()),"undefined"!=typeof b.updates.searchRequest&&b.updates.searchRequest.abort(),a("body").addClass("loading-content"),b.updates.searchRequest=b.ajax.post("search-install-plugins",f).done(function(c){a("body").removeClass("loading-content"),e.append(c.items),delete b.updates.searchRequest,0===c.count?b.a11y.speak(b.updates.l10n.noPluginsFound):b.a11y.speak(b.updates.l10n.pluginsFound.replace("%d",c.count))}))},500)),i.length&&i.attr("aria-describedby","live-search-desc"),i.on("keyup input",_.debounce(function(c){var d,e={_ajax_nonce:b.updates.ajaxNonce,s:c.target.value,pagenow:pagenow,plugin_status:"all"};"keyup"===c.type&&27===c.which&&(c.target.value=""),b.updates.searchTerm!==e.s&&(b.updates.searchTerm=e.s,d=_.object(_.compact(_.map(location.search.slice(1).split("&"),function(a){
+if(a)return a.split("=")}))),e.plugin_status=d.plugin_status||"all",window.history&&window.history.replaceState&&window.history.replaceState(null,"",location.href.split("?")[0]+"?s="+e.s+"&plugin_status="+e.plugin_status),"undefined"!=typeof b.updates.searchRequest&&b.updates.searchRequest.abort(),f.empty(),a("body").addClass("loading-content"),a(".subsubsub .current").removeClass("current"),b.updates.searchRequest=b.ajax.post("search-plugins",e).done(function(c){var d=a("<span />").addClass("subtitle").html(b.updates.l10n.searchResults.replace("%s",_.escape(e.s))),g=a(".wrap .subtitle");e.s.length?g.length?g.replaceWith(d):a(".wp-header-end").before(d):(g.remove(),a(".subsubsub ."+e.plugin_status+" a").addClass("current")),a("body").removeClass("loading-content"),f.append(c.items),delete b.updates.searchRequest,0===c.count?b.a11y.speak(b.updates.l10n.noPluginsFound):b.a11y.speak(b.updates.l10n.pluginsFound.replace("%d",c.count))}))},500)),d.on("submit",".search-plugins",function(b){b.preventDefault(),a("input.wp-filter-search").trigger("input")}),a("#typeselector").on("change",function(){var b=a('input[name="s"]');b.val().length&&b.trigger("input","typechange")}),a("#plugin_update_from_iframe").on("click",function(b){var c,d=window.parent===window?null:window.parent;a.support.postMessage=!!window.postMessage,!1!==a.support.postMessage&&null!==d&&-1===window.parent.location.pathname.indexOf("update-core.php")&&(b.preventDefault(),c={action:"update-plugin",data:{plugin:a(this).data("plugin"),slug:a(this).data("slug")}},d.postMessage(JSON.stringify(c),window.location.origin))}),a("#plugin_install_from_iframe").on("click",function(b){var c,d=window.parent===window?null:window.parent;a.support.postMessage=!!window.postMessage,!1!==a.support.postMessage&&null!==d&&-1===window.parent.location.pathname.indexOf("index.php")&&(b.preventDefault(),c={action:"install-plugin",data:{slug:a(this).data("slug")}},d.postMessage(JSON.stringify(c),window.location.origin))}),a(window).on("message",function(c){var d,e=c.originalEvent,f=document.location.protocol+"//"+document.location.hostname;if(e.origin===f){try{d=a.parseJSON(e.data)}catch(g){return}if("undefined"!=typeof d.action)switch(d.action){case"decrementUpdateCount":b.updates.decrementCount(d.upgradeType);break;case"install-plugin":case"update-plugin":window.tb_remove(),d.data=b.updates._addCallbacks(d.data,d.action),b.updates.queue.push(d),b.updates.queueChecker()}}}),a(window).on("beforeunload",b.updates.beforeunload)})}(jQuery,window.wp,window._wpUpdatesSettings);
\ No newline at end of file

programming_language: JavaScript
filename: version.php
change_type: ModificationType.MODIFY
diff: @@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-beta1-40716';
+$wp_version = '4.8-beta1-40723';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

programming_language: PHP