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php imap_open Remote Code Execution

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php imap_open Remote Code Execution

Disclosed
10/23/2018
Created
03/19/2019

Description

The imap_open function within php, if called without the /norsh flag, will attempt to preauthenticate an IMAP session. On Debian based systems, including Ubuntu, rsh is mapped to the ssh binary. Ssh's ProxyCommand option can be passed from imap_open to execute arbitrary commands. While many custom applications may use imap_open, this exploit works against the following applications: e107 v2, prestashop, SuiteCRM, as well as Custom, which simply prints the exploit strings for use. Prestashop exploitation requires the admin URI, and administrator credentials. suiteCRM/e107 require administrator credentials. Fixed in php 5.6.39.

Author(s)

  • Anton Lopanitsyn
  • Twoster
  • h00die
  • Paolo Serracino
  • Pietro Minniti
  • Damiano Proietti

Platform

Unix

Architectures

cmd

Development

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/http/php_imap_open_rce
msf exploit(php_imap_open_rce) > show targets
    ...targets...
msf exploit(php_imap_open_rce) > set TARGET < target-id >
msf exploit(php_imap_open_rce) > show options
    ...show and set options...
msf exploit(php_imap_open_rce) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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