module

DHCP Client Bash Environment Variable Code Injection (Shellshock)

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Disclosed
2014-09-24
Created
2018-05-30

Description

This module exploits the Shellshock vulnerability, a flaw in how the Bash shell
handles external environment variables. This module targets dhclient by responding
to DHCP requests with a malicious hostname, domainname, and URL which are then
passed to the configuration scripts as environment variables, resulting in code
execution.

Authors

scriptjunkie
apconole apconole@yahoo.com
Stephane Chazelas
Ramon de C Valle rcvalle@metasploit.com

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 auxiliary/server/dhclient_bash_env
    msf auxiliary(dhclient_bash_env) > show actions
        ...actions...
    msf auxiliary(dhclient_bash_env) > set ACTION < action-name >
    msf auxiliary(dhclient_bash_env) > show options
        ...show and set options...
    msf auxiliary(dhclient_bash_env) > run
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