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IT Security and Insecurity Portal |
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Uploaded shell, but... |
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 Posted: Wed Jul 23, 2008 9:59 pm |
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| chip |
| Beginner |
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| Joined: Jul 24, 2008 |
| Posts: 4 |
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Hey there.
I'm checking some security vulnerabilities on an SMF 1.1.4 forum, which from what I know has a few notable holes allowing RFI and SQL Injection attacks. However, these attacks require register_globals to be ON, but on the target host, register_globals is OFF.
So, I have a look around the forum to see anything interesting/vulnerable. Amazingly, the forum admin has allowed uploading of attachments OF ANY KIND, which means I can upload php files with ease. So far so good.
Next, I upload a certain php shell!
Normally, any uploaded attachments go to http://example.com/forum/attachments/
And, I know that the admin also has "encrypt filenames" disabled. Now all I need to do is go to: http://example.com/forum/attachments/shell.php and hopefully I can start using my shell... only to come across this:
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"Forbidden
You don't have permission to access /forums/attachments/ on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."
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Huh? Damn. I can't access the folder, so I can't access my shell anymore. Is there a workaround for this? Can I access my shell using another php file on the server?
Any help or hints would be appreciated.
(Note: clicking on the link from the post's attachment only downloads the shell without executing it.) |
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| Posted: Thu Jul 24, 2008 1:50 am |
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| gibbocool |
| Advanced user |
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| Joined: Jan 22, 2008 |
| Posts: 208 |
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hmm, try and upload shell.php%00
otherwise, you can try overwrite the .htaccess |
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| Posted: Thu Jul 24, 2008 11:35 am |
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| chip |
| Beginner |
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| Joined: Jul 24, 2008 |
| Posts: 4 |
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| gibbocool wrote: | hmm, try and upload shell.php%00
otherwise, you can try overwrite the .htaccess |
Thank you for your post. Here's what happened:
Uploading .htaccess didn't make any change to dir permission, I still got the 403 Forbidden error.
Now for shell.php%00 I got this instead:
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Not Found
The requested URL /forums/attachments/shell.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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EDIT: I tried the %00 in another SMF forum that I own with "encrypt filenames" disabled, also didn't work.
Any other suggestions? |
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Last edited by chip on Thu Jul 24, 2008 12:02 pm; edited 2 times in total |
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| Posted: Thu Jul 24, 2008 11:59 am |
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| gibbocool |
| Advanced user |
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| Joined: Jan 22, 2008 |
| Posts: 208 |
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I'm not too sure what's going on, perhaps some other members can elaborate.
Have you tried uploading .html files or any other files to see if they are forbidden? |
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| Posted: Thu Jul 24, 2008 12:19 pm |
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| chip |
| Beginner |
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| Joined: Jul 24, 2008 |
| Posts: 4 |
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Hmm ok.
1. You can upload any type of file you want.
2. The file goes to example.com/forums/attachments/
3. But you can't directly go to /forums/attachments/ in the url because it is forbidden.
To make it simple, it's the same thing as this: http://www.waraxe.us/admin/whatever.php
uploading an .htacess didn't change anything, shell.php%00 didn't work
Any other ideas? |
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| Posted: Thu Jul 24, 2008 2:06 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| You have access to admin panel? |
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| Posted: Thu Jul 24, 2008 2:15 pm |
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| chip |
| Beginner |
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| Joined: Jul 24, 2008 |
| Posts: 4 |
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| koko wrote: | | You have access to admin panel? |
Nope, but you get the same 403 Error as in the SMF forum. Any way to get around this? |
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| Posted: Thu Jul 24, 2008 5:44 pm |
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| pexli |
| Valuable expert |
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| Joined: May 24, 2007 |
| Posts: 665 |
| Location: Bulgaria |
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| I think only if you have access to admin panel.Via admin panel you mai change the upload directory and try to upload shell. |
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