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metasploit-framework
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improved unix cmd encoder 

git-svn-id: file:///home/svn/framework3/trunk@6738 4d416f70-5f16-0410-b530-b9f4589650da
unstable
James Lee 2009-07-03 06:35:13 +00:00
parent 54b9c3e3f5
commit 01953f7c16
1 changed files with 26 additions and 11 deletions
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29
modules/encoders/cmd/generic_sh.rb
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@ -33,10 +33,22 @@ class Metasploit3 < Msf::Encoder
# #
def encode_block(state, buf) def encode_block(state, buf)
# Remove spaces from the command string if (state.badchars.include?("-"))
# Then neither of the others will work. Get rid of spaces and hope
# for the best. This obviously won't work if the command already
# has other badchars in it, in which case we're basically screwed.
if (state.badchars.include?(" ")) if (state.badchars.include?(" "))
buf.gsub!(/\s/, '${IFS}') buf.gsub!(/\s/, '${IFS}')
end end
else
# Without an escape character we can't escape anything, so echo
# won't work. Try perl.
if (state.badchars.include?("\\"))
buf = encode_block_perl(state,buf)
else
buf = encode_block_bash_echo(state,buf)
end
end
return buf return buf
end end
@ -51,7 +63,7 @@ class Metasploit3 < Msf::Encoder
qot = ',-:.=+!@#$%^&' qot = ',-:.=+!@#$%^&'
# Find a quoting character to use # Find a quoting character to use
state.badchars.unpack('C*') { |c| quot.delete(c.chr) } state.badchars.unpack('C*') { |c| qot.delete(c.chr) }
# Throw an error if we ran out of quotes # Throw an error if we ran out of quotes
raise RuntimeError if qot.length == 0 raise RuntimeError if qot.length == 0
@ -72,7 +84,7 @@ class Metasploit3 < Msf::Encoder
raise RuntimeError raise RuntimeError
end end
cmd << "system\\(pack\\(qq#{sep}H\\*#{sep},#{hex}\\)\\)" cmd << "system\\(pack\\(qq#{sep}H\\*#{sep},qq#{sep}#{hex}#{sep}\\)\\)"
else else
if (state.badchars.match(/\(|\)/)) if (state.badchars.match(/\(|\)/))
@ -81,9 +93,9 @@ class Metasploit3 < Msf::Encoder
raise RuntimeError raise RuntimeError
end end
cmd << "'system pack qq#{sep}H*#{sep},#{hex}'" cmd << "'system pack qq#{sep}H*#{sep},qq#{sep}#{hex}#{sep}'"
else else
cmd << "'system(pack(qq#{sep}H*#{sep},#{hex}))'" cmd << "'system(pack(qq#{sep}H*#{sep},qq#{sep}#{hex}#{sep}))'"
end end
end end
@ -106,10 +118,14 @@ class Metasploit3 < Msf::Encoder
# Are pipe characters restricted? # Are pipe characters restricted?
if (state.badchars.include?("|")) if (state.badchars.include?("|"))
# How about backticks? # How about backticks?
if (state.badchars.include?("`")) if (state.badchars.include?("`"))
# Last ditch effort, dollar paren
if (state.badchars.include?("$") or state.badchars.include?("("))
raise RuntimeError raise RuntimeError
else
buf = "$(echo -ne #{hex})"
end
else else
buf = "`echo -ne #{hex}`" buf = "`echo -ne #{hex}`"
end end
@ -125,5 +141,4 @@ class Metasploit3 < Msf::Encoder
return buf return buf
end end
end end