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Endian Firewall Proxy Password Change Command Injection

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Endian Firewall Proxy Password Change Command Injection

Disclosed
06/28/2015
Created
05/30/2018

Description

This module exploits an OS command injection vulnerability in a web-accessible CGI script used to change passwords for locally-defined proxy user accounts. Valid credentials for such an account are required. Command execution will be in the context of the "nobody" account, but this account had broad sudo permissions, including to run the script /usr/local/bin/chrootpasswd (which changes the password for the Linux root account on the system to the value specified by console input once it is executed). The password for the proxy user account specified will *not* be changed by the use of this module, as long as the target system is vulnerable to the exploit. Very early versions of Endian Firewall (e.g. 1.1 RC5) require HTTP basic auth credentials as well to exploit this vulnerability. Use the USERNAME and PASSWORD advanced options to specify these values if required. Versions >= 3.0.0 still contain the vulnerable code, but it appears to never be executed due to a bug in the vulnerable CGI script which also prevents normal use (http://jira.endian.com/browse/UTM-1002). Versions 2.3.x and 2.4.0 are not vulnerable because of a similar bug (http://bugs.endian.com/print_bug_page.php?bug_id=3083). Tested successfully against the following versions of EFW Community: 1.1 RC5, 2.0, 2.1, 2.2, 2.5.1, 2.5.2. Should function against any version from 1.1 RC5 to 2.2.x, as well as 2.4.1 and 2.5.x.

Author(s)

  • Ben Lincoln

Platform

Linux

Development

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

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