We will try playing around with the type to see if we can keep the name and extension as. This is the raw payload that gets sent through the upload process. So I copied that request to repeater and let’s see if we can modify it to pass So my shell.php file that is spoofed to look like a JPEG image POSTed to the server, but was rejected. js files, and see if we can at least get the file uploaded. Let’s fire up Burp and modify the settings to intercept. We can assume that the server is going to also check for the magic number, so I changed the first 4 bits to FF D8 FF E0 and now the file shows up as JPEG image data. With BurpSuite, we can go ahead and intercept the JS and remove the client side checks for our upload, but we are going to need to modify the magic number of our file, and also see if the server checks for file extensions. We can assume the server side filtering must be similar. The file has the magic number of with ÿØÿ which is for JPEG/JPG images.While it runs, we can try to determine what files the uploader will accept.īack to the source code, we have client side filtering that checks to ensure: └─$ gobuster dir -u -w /home/kali/Downloads/UploadVulnsWordlist.txt -e -x 'php,txt,jpg,gif,png,log' We do know that the first four images were in the /content directory and we have a wordlist to crack future names that we can use gobuster for.įor now, I am going to run a scan of this directory for certain files that may prove useful such as php, txt, jpg, gif, png, log files. We cannot see inside of either /content or /modules, as directory indexing is off. We can see there is /admin page that will execute something in the /modules directory. =ħ 13:23:57 Starting gobuster in directory enumeration mode I am going to go ahead and run GoBuster with the common wordlist for directories to see if there is any other directory of interest. So we will keep this in mind when we search for the files. The challenge did give us a custom wordlist to use for gobuster for the filenames, and looking at them the files will be named a random 3 letter A-Z name. At this time I don’t know if these are just assets the website is pre-loaded with or uploaded files. The images are stored in /content and have a random 3 digit code like ABH, LKQ, SAD, UAD. The source code shows four div elements that the background cycles through. We can already see the background is changing and the upload text says to upload a nice image of a gem or a jewel, so chances are the file we upload would get passed to this slideshow on the main page. Perhaps I'm not calling it correctly? Do I need to call a function in the PHP vs.Alright this final challenge gives us a website and it’s up to us to figure out everything on our own! First let’s navigate to the website. Revsh=" " (that's where the shell is located) I would think I'd just have to replace 'ipconfig' with the path of the PHP script, or something similar. What I'm struggling with is executing the PHP script from the above URL. So the shell isn't the problem I don't think. When I do that my nc listener in kali gets a Windows shell. Since it's a test machine, I can navigate to it and click on it. The above displays the access logs with the output of ipconfig embedded. I can run Windows commands via the URL by running: So the PHP code, and the PHP reverse script are on the machine. I've also contaminated the Apache logs with: I have a vulnerable Windows machine, and I've uploaded a PHP reverse shell to it. I'm stuck trying to get a reverse shell to execute by calling it through a URL.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |