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Add additional platforms and decoders

This commit is contained in:
Spencer McIntyre 2024-02-12 14:02:51 -05:00 committed by Christophe De La Fuente
parent 49e689d909
commit 1cd5b707bb
1 changed files with 12 additions and 3 deletions
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15
modules/encoders/cmd/base64.rb
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@ -20,12 +20,12 @@ class MetasploitModule < Msf::Encoder
},
'Author' => 'Spencer McIntyre',
'Arch' => ARCH_CMD,
'Platform' => %w[linux unix],
'Platform' => %w[bsd bsdi linux osx solaris unix],
'EncoderType' => Msf::Encoder::Type::CmdPosixBase64)
register_advanced_options(
[
OptString.new('Base64Decoder', [ false, 'The binary to use for base64 decoding', '', %w[base64 openssl] ])
OptString.new('Base64Decoder', [ false, 'The binary to use for base64 decoding', '', %w[base64 base64-long base64-short openssl] ])
],
self.class
)
@ -46,7 +46,12 @@ class MetasploitModule < Msf::Encoder
base64_buf = Base64.strict_encode64(buf)
case datastore['Base64Decoder']
when 'base64'
raise EncodingError if (state.badchars.bytes & '(|)'.bytes).any?
base64_decoder = '(base64 --decode || base64 -d)'
when 'base64-long'
base64_decoder = 'base64 --decode'
when 'base64-short'
base64_decoder = 'base64 -d'
when 'openssl'
base64_decoder = 'openssl enc -base64 -d'
@ -54,8 +59,10 @@ class MetasploitModule < Msf::Encoder
# find a decoder at runtime if we can use the necessary characters
if (state.badchars.bytes & '(|)>/&'.bytes).empty?
base64_decoder = '((command -v base64 >/dev/null && (base64 --decode || base64 -d)) || (command -v openssl >/dev/null && openssl enc -base64 -d))'
elsif (state.badchars.bytes & '(|)'.bytes).empty?
base64_decoder = '(base64 --decode || base64 -d)'
else
base64_decoder = 'base64 -d'
base64_decoder = 'openssl enc -base64 -d'
end
end
@ -63,6 +70,8 @@ class MetasploitModule < Msf::Encoder
buf = "echo #{base64_buf}|#{base64_decoder}|sh"
elsif (state.badchars.bytes & '<()'.bytes).empty?
buf = "sh < <(#{base64_decoder} < <(echo #{base64_buf}))"
elsif (state.badchars.bytes & '<`\''.bytes).empty?
buf = "sh<<<`#{base64_decoder}<<<'#{base64_buf}'`"
else
raise EncodingError
end