module

Serv-U FTP Server prepareinstallation Privilege Escalation

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Disclosed
2019-06-05
Created
2019-07-02

Description

This module attempts to gain root privileges on systems running
Serv-U FTP Server versions prior to 15.1.7.

The `Serv-U` executable is setuid `root`, and uses `ARGV[0]`
in a call to `system()`, without validation, when invoked with
the `-prepareinstallation` flag, resulting in command execution
with root privileges.

This module has been tested successfully on Serv-U FTP Server
version 15.1.6 (x64) on Debian 9.6 (x64).

Authors

Guy Levin
bcoles bcoles@gmail.com

Platform

Linux

Architectures

x86, x64, armle, aarch64, ppc, mipsle, mipsbe

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands ‘show options’ or ‘show advanced’:


    msf > use exploit/linux/local/servu_ftp_server_prepareinstallation_priv_esc
    msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > show targets
        ...targets...
    msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > set TARGET < target-id >
    msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > show options
        ...show and set options...
    msf exploit(servu_ftp_server_prepareinstallation_priv_esc) > exploit
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