FCKEditor (now known as CKEditor [1]) is a popular full featured GUI editor many web sites use. For example, you frequently find it with blog systems like WordPress or as part of commenting/forum systems. As an additional feature, a filemanager can be added to allow users to upload images or other files. Sadly, while a very nice and functional plugin, this features if frequently not well secured and can be used to upload malicious files. We have seen some scans probing specifically for this file manager plugin:

GET /editor/editor/filemanager/connectors/uploadtest.html HTTP/1.1

GET /editor/editor/filemanager/upload/test.html HTTP/1.1

GET /editor/editor/filemanager/browser/default/connectors/test.html HTTP/1.1

GET /editor/editor/filemanager/connectors/test.html HTTP/1.1

GET /admin/fckeditor/editor/filemanager/connectors/test.html HTTP/1.1

GET /FCKeditor/editor/filemanager/upload/test.html HTTP/1.1

GET /Fckeditor/editor/filemanager/browser/default/connectors/test.html HTTP/1.1

GET /admin/FCKeditor/editor/filemanager/connectors/uploadtest.html HTTP/1.1

GET /admin/FCKeditor/editor/filemanager/upload/test.html HTTP/1.1

GET /Fckeditor/editor/filemanager/connectors/test.html HTTP/1.1

GET /admin/fckeditor/editor/filemanager/browser/default/connectors/test.html HTTP/1.1
GET /FCKeditor/editor/filemanager/connectors/uploadtest.html HTTP/1.1

I am still looking for any samples of files these script attempt to upload. If you got any, please let use know.

[1] http://ckeditor.com

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Johannes B. Ullrich, Ph.D.
SANS Technology Institute
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