![]() First off, CoreFTP team was extremely fast at replying and patching these vulnerabilities and you can update your application so that you're not vulnerable. Results in the following stack overflow TLDR / Takeaways During the secure algorithm negotiation, if the client provides an oversized second step, the application will crash. The next vulnerability was an overflow in the implementation of the SSH Service. Notice that the file has been placed outside the locked permission set. The following curl command will successfully bypass the lock permissions curl -k -X PUT -H "Host: " -basic -u : -data-binary "PoC." -path-as-is More readable format PUT /./whoops HTTP/1.1 To exploit this vulnerability, escape from the permission lock simply using a PUT HTTP verb with a. User-Agent: Mozilla/5.0 (Windows NT 10.0 Win64 圆4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/.45 Safari/537.36Īccept: text/html,application/xhtml+xml,application/xml q=0.9,image/avif,image/webp,image/apng,*/* q=0.8,application/signed-exchange v=b3 q=0.9Ĭontent-Disposition: form-data name="uploadfile" filename="random.dat" Example below POST /?T HTTP/1.1Ĭontent-Type: multipart/form-data boundary=-WebKitFormBoundaryiULcJSomxAyFsnjd The normal use case for an HTTP file upload is a POST request with basic WebKitFormBoundary with the file data. ![]() With the server started up, an authenticated user can upload files through the HTTPS service with basic authentication. Permissions set on the home directory is given access to read and list. This being that the users home directory is locked to C:\Temp locally. The following was the least amount of access I could set permission. The application has several different options, so I tried to make it as "real world" as possible. ![]() A patch has been released and you can check on their forums to see that the new build version is 727! Proof of Concept - Arbitrary File Write (HTTPS) Shodan clocked in ~2,000 publicly available servers. Although, if anonymous logon is enabled then exploitation of this would be considered unauthenticated. The following vulnerabilities can be exploited remotely, however one requires authentication. The following was found on Core FTP/SFTP Server v2 - Build 725 (64-bit).
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